CVE-2026-73436 (GCVE-0-2026-73436)
Vulnerability from cvelistv5
Published
2026-09-16 09:19
Modified
2026-09-16 13:50
CWE
  • CWE-1284 - Improper Validation of Specified Quantity in Input
  • CWE-125 - Out-of-bounds Read
Summary
On affected platforms running Arista EOS with OSPFv2 and OSPFv2 segment routing configured, a specially crafted OSPFv2 packet from an adjacent OSPF neighbor may cause OSPF to restart unexpectedly.
Impacted products
Vendor Product Version
Arista Networks EOS Version: 4.36.0F   <
Version: 4.35.0F   <
Version: 4.34.0F   <
Version: 4.33.0F   <
Version: 1.0.0   < 4.33.0F
Create a notification for this product.
Show details on NVD website


{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-73436",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-16T13:50:10.659104Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-16T13:50:22.868Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "platforms": [
            "710 Series",
            "720D Series",
            "720XP/722XPM Series",
            "750X Series",
            "7010 Series",
            "7010X Series",
            "7020R/R4 Series",
            "7130 Series running EOS",
            "7150 Series",
            "7160 Series",
            "7170 Series",
            "7050X/X2/X3/X4 Series",
            "7060X/X2/X4/X5/X6 Series",
            "7250X Series",
            "7260X/X3 Series",
            "7280R/R2/R3/R4 Series",
            "7300X/X3 Series",
            "7320X Series",
            "7358X4 Series",
            "7368X4 Series",
            "7388X5 Series",
            "7500R/R2/R3 Series",
            "7800R3/R4 Series",
            "7700R4 Series",
            "AWE 5000 Series",
            "AWE 7200R Series",
            "CloudEOS",
            "cEOS-lab",
            "vEOS-lab",
            "CloudVision eXchange, virtual or physical appliance"
          ],
          "product": "EOS",
          "vendor": "Arista Networks",
          "versions": [
            {
              "lessThanOrEqual": "4.36.1F",
              "status": "affected",
              "version": "4.36.0F",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "4.35.5M",
              "status": "affected",
              "version": "4.35.0F",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "4.34.7.1M",
              "status": "affected",
              "version": "4.34.0F",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "4.33.9M",
              "status": "affected",
              "version": "4.33.0F",
              "versionType": "custom"
            },
            {
              "lessThan": "4.33.0F",
              "status": "affected",
              "version": "1.0.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eIn order to be vulnerable to CVE-2026-73436, the following condition must be met:\u003c/p\u003e\u003cp\u003eOSPFv2 segment routing must be configured. If the below command shows any OSPF instance, then the deployment is vulnerable.\u003c/p\u003e\u003cpre\u003eswitch\u003eshow ip ospf segment-routing\nSPF Instance ID: 1\n...\u003c/pre\u003e\u003cp\u003eIf OSPFv2 segment routing is not configured, then there is no exposure to this issue.\u003c/p\u003e"
            }
          ],
          "value": "In order to be vulnerable to CVE-2026-73436, the following condition must be met:\n\nOSPFv2 segment routing must be configured. If the below command shows any OSPF instance, then the deployment is vulnerable.\n\n  switch\u003eshow ip ospf segment-routing\n  SPF Instance ID: 1\n  ...\n\nIf OSPFv2 segment routing is not configured, then there is no exposure to this issue."
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eOn affected platforms running Arista EOS with OSPFv2 and OSPFv2 segment routing configured, a specially crafted OSPFv2 packet from an adjacent OSPF neighbor may cause OSPF to restart unexpectedly.\u003c/p\u003e\u003cp\u003eThese issues were discovered internally by Arista, and the company is not aware of any malicious uses of these issues in customer networks.\u003c/p\u003e"
            }
          ],
          "value": "On affected platforms running Arista EOS with OSPFv2 and OSPFv2 segment routing configured, a specially crafted OSPFv2 packet from an adjacent OSPF neighbor may cause OSPF to restart unexpectedly."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV4_0": {
            "baseScore": 6,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1284",
              "description": "CWE-1284 Improper Validation of Specified Quantity in Input",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125 Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T10:13:39.211Z",
        "orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
        "shortName": "Arista"
      },
      "references": [
        {
          "name": "Security Advisory 0171",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24727-security-advisory-0171"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eThe recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below.\u003c/p\u003e\u003cp\u003eCVE-2026-73436 has been fixed in the following releases:\u003c/p\u003e\u003cul\u003e\u003cli\u003e4.36.2F and later releases in the 4.36.x train\u003c/li\u003e\u003cli\u003e4.35.6M and later releases in the 4.35.x train\u003c/li\u003e\u003cli\u003e4.34.8M and later releases in the 4.34.x train\u003c/li\u003e\u003cli\u003e4.33.10M and later releases in the 4.33.x train\u003c/li\u003e\u003c/ul\u003e\u003cp\u003eNo hotfix is available for CVE-2026-73436.\u003c/p\u003e"
            }
          ],
          "value": "The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below.\n\nCVE-2026-73436 has been fixed in the following releases:\n- 4.36.2F and later releases in the 4.36.x train\n- 4.35.6M and later releases in the 4.35.x train\n- 4.34.8M and later releases in the 4.34.x train\n- 4.33.10M and later releases in the 4.33.x train\n\nNo hotfix is available for CVE-2026-73436."
        }
      ],
      "source": {
        "advisory": "Security Advisory 0171",
        "defects": [
          "BUG 1843812"
        ],
        "discovery": "INTERNAL"
      },
      "title": "Security Advisory 0171",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eNo mitigation is available for CVE-2026-73436.\u003c/p\u003e"
            }
          ],
          "value": "No mitigation is available for CVE-2026-73436."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
    "assignerShortName": "Arista",
    "cveId": "CVE-2026-73436",
    "datePublished": "2026-09-16T09:19:47.800Z",
    "dateReserved": "2026-08-12T16:39:35.976Z",
    "dateUpdated": "2026-09-16T13:50:22.868Z",
    "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-2026-73436\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-16T13:50:10.659104Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-16T13:50:16.644Z\"}}], \"cna\": {\"title\": \"Security Advisory 0171\", \"source\": {\"defects\": [\"BUG 1843812\"], \"advisory\": \"Security Advisory 0171\", \"discovery\": \"INTERNAL\"}, \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 6.5, \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}, {\"format\": \"CVSS\", \"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 6, \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Arista Networks\", \"product\": \"EOS\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.36.0F\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"4.36.1F\"}, {\"status\": \"affected\", \"version\": \"4.35.0F\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"4.35.5M\"}, {\"status\": \"affected\", \"version\": \"4.34.0F\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"4.34.7.1M\"}, {\"status\": \"affected\", \"version\": \"4.33.0F\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"4.33.9M\"}, {\"status\": \"affected\", \"version\": \"1.0.0\", \"lessThan\": \"4.33.0F\", \"versionType\": \"custom\"}], \"platforms\": [\"710 Series\", \"720D Series\", \"720XP/722XPM Series\", \"750X Series\", \"7010 Series\", \"7010X Series\", \"7020R/R4 Series\", \"7130 Series running EOS\", \"7150 Series\", \"7160 Series\", \"7170 Series\", \"7050X/X2/X3/X4 Series\", \"7060X/X2/X4/X5/X6 Series\", \"7250X Series\", \"7260X/X3 Series\", \"7280R/R2/R3/R4 Series\", \"7300X/X3 Series\", \"7320X Series\", \"7358X4 Series\", \"7368X4 Series\", \"7388X5 Series\", \"7500R/R2/R3 Series\", \"7800R3/R4 Series\", \"7700R4 Series\", \"AWE 5000 Series\", \"AWE 7200R Series\", \"CloudEOS\", \"cEOS-lab\", \"vEOS-lab\", \"CloudVision eXchange, virtual or physical appliance\"], \"defaultStatus\": \"unaffected\"}], \"solutions\": [{\"lang\": \"en\", \"value\": \"The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below.\\n\\nCVE-2026-73436 has been fixed in the following releases:\\n- 4.36.2F and later releases in the 4.36.x train\\n- 4.35.6M and later releases in the 4.35.x train\\n- 4.34.8M and later releases in the 4.34.x train\\n- 4.33.10M and later releases in the 4.33.x train\\n\\nNo hotfix is available for CVE-2026-73436.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eThe recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below.\u003c/p\u003e\u003cp\u003eCVE-2026-73436 has been fixed in the following releases:\u003c/p\u003e\u003cul\u003e\u003cli\u003e4.36.2F and later releases in the 4.36.x train\u003c/li\u003e\u003cli\u003e4.35.6M and later releases in the 4.35.x train\u003c/li\u003e\u003cli\u003e4.34.8M and later releases in the 4.34.x train\u003c/li\u003e\u003cli\u003e4.33.10M and later releases in the 4.33.x train\u003c/li\u003e\u003c/ul\u003e\u003cp\u003eNo hotfix is available for CVE-2026-73436.\u003c/p\u003e\", \"base64\": false}]}], \"references\": [{\"url\": \"https://www.arista.com/en/support/advisories-notices/security-advisory/24727-security-advisory-0171\", \"name\": \"Security Advisory 0171\", \"tags\": [\"vendor-advisory\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"No mitigation is available for CVE-2026-73436.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eNo mitigation is available for CVE-2026-73436.\u003c/p\u003e\", \"base64\": false}]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"On affected platforms running Arista EOS with OSPFv2 and OSPFv2 segment routing configured, a specially crafted OSPFv2 packet from an adjacent OSPF neighbor may cause OSPF to restart unexpectedly.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eOn affected platforms running Arista EOS with OSPFv2 and OSPFv2 segment routing configured, a specially crafted OSPFv2 packet from an adjacent OSPF neighbor may cause OSPF to restart unexpectedly.\u003c/p\u003e\u003cp\u003eThese issues were discovered internally by Arista, and the company is not aware of any malicious uses of these issues in customer networks.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-1284\", \"description\": \"CWE-1284 Improper Validation of Specified Quantity in Input\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"CWE-125 Out-of-bounds Read\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"In order to be vulnerable to CVE-2026-73436, the following condition must be met:\\n\\nOSPFv2 segment routing must be configured. If the below command shows any OSPF instance, then the deployment is vulnerable.\\n\\n  switch\u003eshow ip ospf segment-routing\\n  SPF Instance ID: 1\\n  ...\\n\\nIf OSPFv2 segment routing is not configured, then there is no exposure to this issue.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eIn order to be vulnerable to CVE-2026-73436, the following condition must be met:\u003c/p\u003e\u003cp\u003eOSPFv2 segment routing must be configured. If the below command shows any OSPF instance, then the deployment is vulnerable.\u003c/p\u003e\u003cpre\u003eswitch\u003eshow ip ospf segment-routing\\nSPF Instance ID: 1\\n...\u003c/pre\u003e\u003cp\u003eIf OSPFv2 segment routing is not configured, then there is no exposure to this issue.\u003c/p\u003e\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7\", \"shortName\": \"Arista\", \"dateUpdated\": \"2026-09-16T10:13:39.211Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-73436\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-16T13:50:22.868Z\", \"dateReserved\": \"2026-08-12T16:39:35.976Z\", \"assignerOrgId\": \"c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7\", \"datePublished\": \"2026-09-16T09:19:47.800Z\", \"assignerShortName\": \"Arista\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

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.


Loading…

Loading…