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CVE-2026-20031 (GCVE-0-2026-20031)

Vulnerability from cvelistv5 – Published: 2026-03-04 17:17 – Updated: 2026-03-05 15:52
VLAI
Title
ClamAV CSS Image Parsing Error Handling Denial of Service Vulnerability
Summary
A vulnerability in the HTML Cascading Style Sheets (CSS) module of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper error handling when splitting UTF-8 strings. An attacker could exploit this vulnerability by submitting a crafted HTML file to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to terminate the scanning process.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-05 15:51 UTC
CWE
Impacted products
Vendor Product Version CPE status
Cisco Cisco Secure Endpoint Affected: 7.0.5
Affected: 6.2.19
Affected: 7.3.3
Affected: 7.2.13
Affected: 6.1.5
Affected: 6.3.1
Affected: 6.2.5
Affected: 7.3.5
Affected: 6.2.1
Affected: 7.2.7
Affected: 7.1.1
Affected: 6.3.5
Affected: 6.2.9
Affected: 7.3.1
Affected: 6.1.7
Affected: 7.2.11
Affected: 7.2.3
Affected: 7.1.5
Affected: 6.3.3
Affected: 7.3.9
Affected: 6.2.3
Affected: 6.1.9
Affected: 6.0.9
Affected: 7.2.5
Affected: 6.0.7
Affected: 6.3.7
Affected: 1.12.3
Affected: 1.8.0
Affected: 1.11.1
Affected: 1.12.4
Affected: 1.10.0
Affected: 1.12.0
Affected: 1.8.1
Affected: 1.10.1
Affected: 1.12.1
Affected: 1.12.6
Affected: 1.14.0
Affected: 1.10.2
Affected: 1.12.7
Affected: 1.12.2
Affected: 1.6.0
Affected: 1.9.0
Affected: 1.11.0
Affected: 1.7.0
Affected: 1.13.0
Affected: 1.8.4
Affected: 1.13.1
Affected: 1.9.1
Affected: 1.12.5
Affected: 1.13.2
Affected: 2.0.2
Affected: 1.1.0
Affected: 2.0.0
Affected: 2.0.1
Affected: 8.1.7.21512
Affected: 8.1.7
Affected: 8.1.5
Affected: 8.1.3.21242
Affected: 8.1.3
Affected: 8.1.5.21322
Affected: 8.1.7.21417
Affected: 2.1.0.14
Affected: 2.2.0
Affected: 2.3.0
Affected: 2.4.0
Affected: 2.5.0
Affected: 2.6.0
Affected: 2.7.0
Affected: 2.8.0
Affected: 2.9.0
Affected: 2.10.0
Affected: 2.10.1
Affected: 2.11.0
Affected: 1.14.1
Affected: 1.15.1
Affected: 1.15.2
Affected: 1.15.3
Affected: 1.15.4
Affected: 1.15.5
Affected: 1.15.6
Affected: 1.16.0
Affected: 1.16.1
Affected: 1.16.2
Affected: 1.16.3
Affected: 1.18.0
Affected: 1.18.1
Affected: 1.20.0
Affected: 1.21.0
Affected: 1.21.1
Affected: 1.21.2
Affected: 1.21.3
Affected: 1.22.0
Affected: 1.22.1
Affected: 1.22.2
Affected: 1.22.3
Affected: 1.22.4
Affected: 1.24.0
Affected: 1.24.1
Affected: 1.24.2
Affected: 1.24.3
Affected: 1.24.4
Affected: 1.26.0
Affected: 1.24.5
Affected: 1.26.1
Affected: 1.27.0
Affected: 1.15.0
Affected: 1.17.0
Affected: 1.17.1
Affected: 1.17.2
Affected: 1.19.0
Affected: 1.20.1
Affected: 1.20.2
Affected: 1.20.3
Affected: 1.20.4
Affected: 1.20.5
Affected: 1.20.6
Affected: 1.23.0
Affected: 1.23.1
Affected: 1.20.7
Affected: 1.20.8
Affected: 1.25.0
Affected: 1.25.1
Affected: 1.25.2
Affected: 1.27.1
Affected: 1.27.2
Affected: 7.3.13
Affected: 7.3.15
Affected: 7.4.1
Affected: 7.4.1.20425
Affected: 7.4.1.20439
Affected: 7.4.3
Affected: 7.4.3.20679
Affected: 7.4.5
Affected: 7.5.1.20813
Affected: 7.5.1.20833
Affected: 7.5.3
Affected: 7.5.5
Affected: 8.0.1.21160
Affected: 8.0.1.21164
Affected: 7.5.7
Affected: 7.5.9
Affected: 7.5.11
Affected: 8.1.7.21585
Affected: 7.5.13.21586
Affected: 7.5.13.21598
Affected: 8.2.1.21612
Affected: 8.2.1.21650
Affected: 7.5.15.21611
Affected: 7.5.17.21680
Affected: 8.2.3.30119
Affected: 8.2.4.30130
Affected: 8.4.0
Affected: 7.5.19
Affected: 8.4.1.30298
Affected: 8.4.2.30317
Affected: 8.4.1.30307
Affected: 7.5.20
Affected: 8.4.3
Affected: 8.4.4.30419
Affected: 8.4.4.30467
Affected: 7.5.21.21732
Affected: 8.4.5.30483
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            },
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              "status": "affected",
              "version": "7.5.15.21611"
            },
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              "status": "affected",
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            },
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability in the HTML Cascading Style Sheets (CSS) module of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to improper error handling when splitting UTF-8 strings. An attacker could exploit this vulnerability by submitting a crafted HTML file to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to terminate the scanning process."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
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        }
      ],
      "problemTypes": [
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              "cweId": "CWE-248",
              "description": "Uncaught Exception",
              "lang": "en",
              "type": "cwe"
            }
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        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "shortName": "cisco"
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      "references": [
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          "name": "cisco-sa-clamav-css-Fn4QSZ",
          "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-css-Fn4QSZ"
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      "source": {
        "advisory": "cisco-sa-clamav-css-Fn4QSZ",
        "defects": [
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        "discovery": "EXTERNAL"
      },
      "title": "ClamAV CSS Image Parsing Error Handling Denial of Service Vulnerability"
    }
  },
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\"version\": \"7.3.13\"}, {\"status\": \"affected\", \"version\": \"7.3.15\"}, {\"status\": \"affected\", \"version\": \"7.4.1\"}, {\"status\": \"affected\", \"version\": \"7.4.1.20425\"}, {\"status\": \"affected\", \"version\": \"7.4.1.20439\"}, {\"status\": \"affected\", \"version\": \"7.4.3\"}, {\"status\": \"affected\", \"version\": \"7.4.3.20679\"}, {\"status\": \"affected\", \"version\": \"7.4.5\"}, {\"status\": \"affected\", \"version\": \"7.5.1.20813\"}, {\"status\": \"affected\", \"version\": \"7.5.1.20833\"}, {\"status\": \"affected\", \"version\": \"7.5.3\"}, {\"status\": \"affected\", \"version\": \"7.5.5\"}, {\"status\": \"affected\", \"version\": \"8.0.1.21160\"}, {\"status\": \"affected\", \"version\": \"8.0.1.21164\"}, {\"status\": \"affected\", \"version\": \"7.5.7\"}, {\"status\": \"affected\", \"version\": \"7.5.9\"}, {\"status\": \"affected\", \"version\": \"7.5.11\"}, {\"status\": \"affected\", \"version\": \"8.1.7.21585\"}, {\"status\": \"affected\", \"version\": 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\"affected\", \"version\": \"8.4.5.30483\"}], \"defaultStatus\": \"unknown\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-css-Fn4QSZ\", \"name\": \"cisco-sa-clamav-css-Fn4QSZ\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability in the HTML Cascading Style Sheets (CSS) module of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\\r\\n\\r\\nThis vulnerability is due to improper error handling when splitting UTF-8 strings. An attacker could exploit this vulnerability by submitting a crafted HTML file to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to terminate the scanning process.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-248\", \"description\": \"Uncaught Exception\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-03-04T17:44:55.869Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-20031\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-05T15:52:07.708Z\", \"dateReserved\": \"2025-10-08T11:59:15.353Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2026-03-04T17:17:33.372Z\", \"assignerShortName\": \"cisco\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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