CVE-2026-6643 (GCVE-0-2026-6643)
Vulnerability from cvelistv5
Published
2026-04-20 06:34
Modified
2026-04-20 13:46
CWE
  • CWE-121 - Stack-based buffer overflow
Summary
A stack-based buffer overflow vulnerability was found in the VPN Clients on the ADM. The issue stems from the use of unbounded sscanf() and passing user-controlled data directly to printf(). Due to the lack of PIE and Stack Canary protections, an authenticated remote attacker can exploit these to execute arbitrary code as the web server user. Affected products and versions include: from ADM 4.1.0 through ADM 4.3.3.RR42 as well as from ADM 5.0.0 through ADM 5.1.2.REO1.
Impacted products
Vendor Product Version
ASUSTOR Inc. ADM Version: 4.1.0   <
Version: 5.0.0   <
Create a notification for this product.
Show details on NVD website


{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-6643",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-20T13:20:51.858306Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-20T13:46:07.764Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageName": "VPN Clients",
          "platforms": [
            "Linux",
            "x86",
            "ARM",
            "64 bit"
          ],
          "product": "ADM",
          "vendor": "ASUSTOR Inc.",
          "versions": [
            {
              "lessThanOrEqual": "4.3.3.RR42",
              "status": "affected",
              "version": "4.1.0",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "5.1.2.REO1",
              "status": "affected",
              "version": "5.0.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "YU-XIANG HUANG (mlgzackfly)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "A stack-based buffer overflow vulnerability was found in the VPN Clients on the ADM. The issue stems from the use of unbounded sscanf() and passing user-controlled data directly to printf(). Due to the lack of PIE and Stack Canary protections, an authenticated remote attacker can exploit these to execute arbitrary code as the web server user. \u003cbr\u003eAffected products and versions include: from ADM 4.1.0 through ADM 4.3.3.RR42 as well as from ADM 5.0.0 through ADM 5.1.2.REO1."
            }
          ],
          "value": "A stack-based buffer overflow vulnerability was found in the VPN Clients on the ADM. The issue stems from the use of unbounded sscanf() and passing user-controlled data directly to printf(). Due to the lack of PIE and Stack Canary protections, an authenticated remote attacker can exploit these to execute arbitrary code as the web server user. \nAffected products and versions include: from ADM 4.1.0 through ADM 4.3.3.RR42 as well as from ADM 5.0.0 through ADM 5.1.2.REO1."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-135",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-135 Format String Injection"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "HIGH",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "LOW",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-121",
              "description": "CWE-121 Stack-based buffer overflow",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-20T06:34:27.511Z",
        "orgId": "f35eaae9-79f2-4d0d-a5c7-7bea6ed6be77",
        "shortName": "ASUSTOR1"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.asustor.com/security/security_advisory_detail?id=54"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "A stack-based buffer overflow vulnerability in the VPN Clients on the ADM",
      "x_generator": {
        "engine": "Vulnogram 1.0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f35eaae9-79f2-4d0d-a5c7-7bea6ed6be77",
    "assignerShortName": "ASUSTOR1",
    "cveId": "CVE-2026-6643",
    "datePublished": "2026-04-20T06:34:27.511Z",
    "dateReserved": "2026-04-20T04:06:43.009Z",
    "dateUpdated": "2026-04-20T13:46:07.764Z",
    "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-2026-6643\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-20T13:20:51.858306Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-20T13:44:50.037Z\"}}], \"cna\": {\"title\": \"A stack-based buffer overflow vulnerability in the VPN Clients on the ADM\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"YU-XIANG HUANG (mlgzackfly)\"}], \"impacts\": [{\"capecId\": \"CAPEC-135\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-135 Format String Injection\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 8.6, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L\", \"exploitMaturity\": \"NOT_DEFINED\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"HIGH\", \"subIntegrityImpact\": \"LOW\", \"vulnIntegrityImpact\": \"HIGH\", \"subAvailabilityImpact\": \"LOW\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"LOW\", \"vulnConfidentialityImpact\": \"HIGH\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"ASUSTOR Inc.\", \"product\": \"ADM\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.1.0\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"4.3.3.RR42\"}, {\"status\": \"affected\", \"version\": \"5.0.0\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"5.1.2.REO1\"}], \"platforms\": [\"Linux\", \"x86\", \"ARM\", \"64 bit\"], \"packageName\": \"VPN Clients\", \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://www.asustor.com/security/security_advisory_detail?id=54\", \"tags\": [\"vendor-advisory\"]}], \"x_generator\": {\"engine\": \"Vulnogram 1.0.1\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A stack-based buffer overflow vulnerability was found in the VPN Clients on the ADM. The issue stems from the use of unbounded sscanf() and passing user-controlled data directly to printf(). Due to the lack of PIE and Stack Canary protections, an authenticated remote attacker can exploit these to execute arbitrary code as the web server user. \\nAffected products and versions include: from ADM 4.1.0 through ADM 4.3.3.RR42 as well as from ADM 5.0.0 through ADM 5.1.2.REO1.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"A stack-based buffer overflow vulnerability was found in the VPN Clients on the ADM. The issue stems from the use of unbounded sscanf() and passing user-controlled data directly to printf(). Due to the lack of PIE and Stack Canary protections, an authenticated remote attacker can exploit these to execute arbitrary code as the web server user. \u003cbr\u003eAffected products and versions include: from ADM 4.1.0 through ADM 4.3.3.RR42 as well as from ADM 5.0.0 through ADM 5.1.2.REO1.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-121\", \"description\": \"CWE-121 Stack-based buffer overflow\"}]}], \"providerMetadata\": {\"orgId\": \"f35eaae9-79f2-4d0d-a5c7-7bea6ed6be77\", \"shortName\": \"ASUSTOR1\", \"dateUpdated\": \"2026-04-20T06:34:27.511Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-6643\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-20T13:46:07.764Z\", \"dateReserved\": \"2026-04-20T04:06:43.009Z\", \"assignerOrgId\": \"f35eaae9-79f2-4d0d-a5c7-7bea6ed6be77\", \"datePublished\": \"2026-04-20T06:34:27.511Z\", \"assignerShortName\": \"ASUSTOR1\"}",
      "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…