CVE-2026-57031 (GCVE-0-2026-57031)
Vulnerability from cvelistv5
Published
2026-07-09 21:13
Modified
2026-07-10 14:37
Severity ?
4.7 (Medium) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
5.3 (Medium) - CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/AU:Y/RE:M
CWE
  • CWE-754 - Improper Check for Unusual or Exceptional Conditions
Summary
An Improper Check for Unusual or Exceptional Conditions vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on MX Series allows adjacent subscribers to bypass configured firewall filters. On MX Series devices with MPC10/11, LC4800/9600, and MX304 with subscribers configured on static interfaces, ingress firewall filters are not enforced, so that neither protocol level nor upstream bandwidth limitation are in effect.  This issue affects Junos OS on MX with MPC10/11, LC4800/9600/4802, and MX304: * 23.2 versions from 23.2R2-S1 before 23.2R2-S7, * 23.4 versions from 23.4R2 before 23.4R2-S7, * 24.2 versions before 24.2R2-S3, * 24.4 versions before 24.4R2-S2, * 25.2 versions before 25.2R2.
References
Impacted products
Vendor Product Version
Juniper Networks Junos OS Version: 23.2R2-S1   < 23.2R2-S7
Version: 23.4R2   < 23.4R2-S7
Version: 24.2   < 24.2R2-S3
Version: 24.4   < 24.4R2-S2
Version: 25.2   < 25.2R2
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-57031",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-10T14:35:02.980850Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-10T14:37:16.783Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "MPC10",
            "MPC11",
            "LC4800",
            "LC9600",
            "MX304-LMIC16"
          ],
          "platforms": [
            "MX Series"
          ],
          "product": "Junos OS",
          "vendor": "Juniper Networks",
          "versions": [
            {
              "lessThan": "23.2R2-S7",
              "status": "affected",
              "version": "23.2R2-S1",
              "versionType": "custom"
            },
            {
              "lessThan": "23.4R2-S7",
              "status": "affected",
              "version": "23.4R2",
              "versionType": "custom"
            },
            {
              "lessThan": "24.2R2-S3",
              "status": "affected",
              "version": "24.2",
              "versionType": "custom"
            },
            {
              "lessThan": "24.4R2-S2",
              "status": "affected",
              "version": "24.4",
              "versionType": "custom"
            },
            {
              "lessThan": "25.2R2",
              "status": "affected",
              "version": "25.2",
              "versionType": "custom"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "To be exposed to this issue a configuration for static subscribers with an input filter is required:\u003cbr\u003e\u003cbr\u003e\n\n\u003ctt\u003e[ system services\u0026nbsp;static-subscribers ]\u003cbr\u003e\u003cbr\u003e\u003c/tt\u003e\u003ctt\u003e[ dynamic-profiles \u0026lt;profile-name\u0026gt; interfaces \u0026lt;interface\u0026gt; unit \u0026lt;unit\u0026gt; family (inet|inet6) filter input \u0026lt;filter-name\u0026gt; ]\u003c/tt\u003e"
            }
          ],
          "value": "To be exposed to this issue a configuration for static subscribers with an input filter is required:\n\n\n\n[ system services\u00a0static-subscribers ]\n\n[ dynamic-profiles \u003cprofile-name\u003e interfaces \u003cinterface\u003e unit \u003cunit\u003e family (inet|inet6) filter input \u003cfilter-name\u003e ]"
        }
      ],
      "datePublic": "2026-07-08T16:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "An Improper Check for Unusual or Exceptional Conditions vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on MX Series allows adjacent subscribers to bypass configured firewall filters.\u003cbr\u003e\u003cbr\u003e\u003cp\u003eOn MX Series devices with\u0026nbsp;MPC10/11, LC4800/9600, and MX304 with\u0026nbsp;subscribers configured on static interfaces, ingress firewall filters are not enforced, so that neither protocol level nor upstream bandwidth limitation are in effect.\u0026nbsp;\u003c/p\u003e\u003cp\u003e\u003cbr\u003eThis issue affects Junos OS on MX with\u0026nbsp;MPC10/11, LC4800/9600/4802, and MX304:\u003cbr\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003e23.2 versions from 23.2R2-S1 before 23.2R2-S7,\u003c/li\u003e\u003cli\u003e23.4 versions from 23.4R2 before 23.4R2-S7,\u003c/li\u003e\u003cli\u003e24.2 versions before 24.2R2-S3,\u003c/li\u003e\u003cli\u003e24.4 versions before 24.4R2-S2,\u003c/li\u003e\u003cli\u003e25.2 versions before 25.2R2.\u003c/li\u003e\u003c/ul\u003e\u003cbr\u003e\u003cp\u003e\u003c/p\u003e"
            }
          ],
          "value": "An Improper Check for Unusual or Exceptional Conditions vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on MX Series allows adjacent subscribers to bypass configured firewall filters.\n\nOn MX Series devices with\u00a0MPC10/11, LC4800/9600, and MX304 with\u00a0subscribers configured on static interfaces, ingress firewall filters are not enforced, so that neither protocol level nor upstream bandwidth limitation are in effect.\u00a0\n\n\nThis issue affects Junos OS on MX with\u00a0MPC10/11, LC4800/9600/4802, and MX304:\n\n\n  *  23.2 versions from 23.2R2-S1 before 23.2R2-S7,\n  *  23.4 versions from 23.4R2 before 23.4R2-S7,\n  *  24.2 versions before 24.2R2-S3,\n  *  24.4 versions before 24.4R2-S2,\n  *  25.2 versions before 25.2R2."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
            }
          ],
          "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV4_0": {
            "Automatable": "YES",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "ADJACENT",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "LOW",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/AU:Y/RE:M",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "MODERATE"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-754",
              "description": "CWE-754 Improper Check for Unusual or Exceptional Conditions",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-09T21:13:46.497Z",
        "orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
        "shortName": "juniper"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://supportportal.juniper.net/JSA110091"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "The following software releases have been updated to resolve this specific issue:\n\nJunos OS: 23.2R2-S7, 23.4R2-S7, 24.2R2-S3, 24.4R2-S2, 25.2R2, 25.4R1, and all subsequent releases."
            }
          ],
          "value": "The following software releases have been updated to resolve this specific issue:\n\nJunos OS: 23.2R2-S7, 23.4R2-S7, 24.2R2-S3, 24.4R2-S2, 25.2R2, 25.4R1, and all subsequent releases."
        }
      ],
      "source": {
        "advisory": "JSA110091",
        "defect": [
          "1902909"
        ],
        "discovery": "USER"
      },
      "title": "Junos OS: MX Series: For subscribers configured on static interfaces, input filters are not in effect",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "There are no known workarounds for this issue."
            }
          ],
          "value": "There are no known workarounds for this issue."
        }
      ],
      "x_generator": {
        "engine": "Vulnogram 0.1.0-dev"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
    "assignerShortName": "juniper",
    "cveId": "CVE-2026-57031",
    "datePublished": "2026-07-09T21:13:46.497Z",
    "dateReserved": "2026-06-23T16:27:00.249Z",
    "dateUpdated": "2026-07-10T14:37:16.783Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-57031\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-07-10T14:35:02.980850Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-07-10T14:36:34.009Z\"}}], \"cna\": {\"title\": \"Junos OS: MX Series: For subscribers configured on static interfaces, input filters are not in effect\", \"source\": {\"defect\": [\"1902909\"], \"advisory\": \"JSA110091\", \"discovery\": \"USER\"}, \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"CHANGED\", \"version\": \"3.1\", \"baseScore\": 4.7, \"attackVector\": \"ADJACENT_NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}, {\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 5.3, \"Automatable\": \"YES\", \"attackVector\": \"ADJACENT\", \"baseSeverity\": \"MEDIUM\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/AU:Y/RE:M\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"LOW\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"MODERATE\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Juniper Networks\", \"modules\": [\"MPC10\", \"MPC11\", \"LC4800\", \"LC9600\", \"MX304-LMIC16\"], \"product\": \"Junos OS\", \"versions\": [{\"status\": \"affected\", \"version\": \"23.2R2-S1\", \"lessThan\": \"23.2R2-S7\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"23.4R2\", \"lessThan\": \"23.4R2-S7\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"24.2\", \"lessThan\": \"24.2R2-S3\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"24.4\", \"lessThan\": \"24.4R2-S2\", \"versionType\": \"custom\"}, {\"status\": \"affected\", \"version\": \"25.2\", \"lessThan\": \"25.2R2\", \"versionType\": \"custom\"}], \"platforms\": [\"MX Series\"], \"defaultStatus\": \"unaffected\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"Juniper SIRT is not aware of any malicious exploitation of this vulnerability.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Juniper SIRT is not aware of any malicious exploitation of this vulnerability.\", \"base64\": false}]}], \"solutions\": [{\"lang\": \"en\", \"value\": \"The following software releases have been updated to resolve this specific issue:\\n\\nJunos OS: 23.2R2-S7, 23.4R2-S7, 24.2R2-S3, 24.4R2-S2, 25.2R2, 25.4R1, and all subsequent releases.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"The following software releases have been updated to resolve this specific issue:\\n\\nJunos OS: 23.2R2-S7, 23.4R2-S7, 24.2R2-S3, 24.4R2-S2, 25.2R2, 25.4R1, and all subsequent releases.\", \"base64\": false}]}], \"datePublic\": \"2026-07-08T16:00:00.000Z\", \"references\": [{\"url\": \"https://supportportal.juniper.net/JSA110091\", \"tags\": [\"vendor-advisory\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"There are no known workarounds for this issue.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"There are no known workarounds for this issue.\", \"base64\": false}]}], \"x_generator\": {\"engine\": \"Vulnogram 0.1.0-dev\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"An Improper Check for Unusual or Exceptional Conditions vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on MX Series allows adjacent subscribers to bypass configured firewall filters.\\n\\nOn MX Series devices with\\u00a0MPC10/11, LC4800/9600, and MX304 with\\u00a0subscribers configured on static interfaces, ingress firewall filters are not enforced, so that neither protocol level nor upstream bandwidth limitation are in effect.\\u00a0\\n\\n\\nThis issue affects Junos OS on MX with\\u00a0MPC10/11, LC4800/9600/4802, and MX304:\\n\\n\\n  *  23.2 versions from 23.2R2-S1 before 23.2R2-S7,\\n  *  23.4 versions from 23.4R2 before 23.4R2-S7,\\n  *  24.2 versions before 24.2R2-S3,\\n  *  24.4 versions before 24.4R2-S2,\\n  *  25.2 versions before 25.2R2.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"An Improper Check for Unusual or Exceptional Conditions vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on MX Series allows adjacent subscribers to bypass configured firewall filters.\u003cbr\u003e\u003cbr\u003e\u003cp\u003eOn MX Series devices with\u0026nbsp;MPC10/11, LC4800/9600, and MX304 with\u0026nbsp;subscribers configured on static interfaces, ingress firewall filters are not enforced, so that neither protocol level nor upstream bandwidth limitation are in effect.\u0026nbsp;\u003c/p\u003e\u003cp\u003e\u003cbr\u003eThis issue affects Junos OS on MX with\u0026nbsp;MPC10/11, LC4800/9600/4802, and MX304:\u003cbr\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003e23.2 versions from 23.2R2-S1 before 23.2R2-S7,\u003c/li\u003e\u003cli\u003e23.4 versions from 23.4R2 before 23.4R2-S7,\u003c/li\u003e\u003cli\u003e24.2 versions before 24.2R2-S3,\u003c/li\u003e\u003cli\u003e24.4 versions before 24.4R2-S2,\u003c/li\u003e\u003cli\u003e25.2 versions before 25.2R2.\u003c/li\u003e\u003c/ul\u003e\u003cbr\u003e\u003cp\u003e\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-754\", \"description\": \"CWE-754 Improper Check for Unusual or Exceptional Conditions\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"To be exposed to this issue a configuration for static subscribers with an input filter is required:\\n\\n\\n\\n[ system services\\u00a0static-subscribers ]\\n\\n[ dynamic-profiles \u003cprofile-name\u003e interfaces \u003cinterface\u003e unit \u003cunit\u003e family (inet|inet6) filter input \u003cfilter-name\u003e ]\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"To be exposed to this issue a configuration for static subscribers with an input filter is required:\u003cbr\u003e\u003cbr\u003e\\n\\n\u003ctt\u003e[ system services\u0026nbsp;static-subscribers ]\u003cbr\u003e\u003cbr\u003e\u003c/tt\u003e\u003ctt\u003e[ dynamic-profiles \u0026lt;profile-name\u0026gt; interfaces \u0026lt;interface\u0026gt; unit \u0026lt;unit\u0026gt; family (inet|inet6) filter input \u0026lt;filter-name\u0026gt; ]\u003c/tt\u003e\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"8cbe9d5a-a066-4c94-8978-4b15efeae968\", \"shortName\": \"juniper\", \"dateUpdated\": \"2026-07-09T21:13:46.497Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-57031\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-10T14:37:16.783Z\", \"dateReserved\": \"2026-06-23T16:27:00.249Z\", \"assignerOrgId\": \"8cbe9d5a-a066-4c94-8978-4b15efeae968\", \"datePublished\": \"2026-07-09T21:13:46.497Z\", \"assignerShortName\": \"juniper\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.