CVE-2025-8351 (GCVE-0-2025-8351)

Vulnerability from cvelistv5 – Published: 2025-12-01 15:51 – Updated: 2026-06-12 22:32
VLAI
Title
Avira antivirus engine heap buffer OOB read when scanning a malformed file
Summary
Heap-based Buffer Overflow, Out-of-bounds Read vulnerability in Avira Antivirus engine when scanning a malformed file may allow Local Execution of Code or Denial-of-Service of the antivirus engine process. This issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.70.98.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Gen Digital Avira Antivirus Affected: 0 , < 8.3.70.98 (custom)
Create a notification for this product.
Date Public
2025-06-25 08:25
Credits
Mike Zhang, an independent security researcher
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-8351",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-12-01T15:57:24.184526Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-12-01T15:58:28.472Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "affected",
          "platforms": [
            "Windows",
            "macOS",
            "Linux"
          ],
          "product": "Avira Antivirus",
          "vendor": "Gen Digital",
          "versions": [
            {
              "lessThan": "8.3.70.98",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Mike Zhang, an independent security researcher"
        }
      ],
      "datePublic": "2025-06-25T08:25:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Heap-based Buffer Overflow, Out-of-bounds Read vulnerability in Avira Antivirus engine when scanning a malformed file may allow Local Execution of Code or Denial-of-Service of the antivirus engine process.\u003cp\u003eThis issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.70.98.\u003c/p\u003e"
            }
          ],
          "value": "Heap-based Buffer Overflow, Out-of-bounds Read vulnerability in Avira Antivirus engine when scanning a malformed file may allow Local Execution of Code or Denial-of-Service of the antivirus engine process.\n\nThis issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.70.98."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-549",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-549 Local Execution of Code"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-122",
              "description": "CWE-122 Heap-based Buffer Overflow",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125 Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-12T22:32:51.689Z",
        "orgId": "dbd8429d-f261-4b1e-94cc-ae3132817e2e",
        "shortName": "GEN"
      },
      "references": [
        {
          "url": "https://www.gendigital.com/us/en/contact-us/security-advisories/"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Upgrade to Avira scan engine build \u003cstrong\u003e8.3.70.98\u003c/strong\u003e or \u003cstrong\u003eany later\u003c/strong\u003e engine release. Builds at or above 8.3.70.98 include the fix."
            }
          ],
          "value": "Upgrade to Avira scan engine build 8.3.70.98 or any later engine release. Builds at or above 8.3.70.98 include the fix."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Avira antivirus engine heap buffer OOB read when scanning a malformed file",
      "x_generator": {
        "engine": "Vulnogram 1.0.2"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "dbd8429d-f261-4b1e-94cc-ae3132817e2e",
    "assignerShortName": "NLOK",
    "cveId": "CVE-2025-8351",
    "datePublished": "2025-12-01T15:51:42.044Z",
    "dateReserved": "2025-07-30T11:48:44.820Z",
    "dateUpdated": "2026-06-12T22:32:51.689Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-8351",
      "date": "2026-06-18",
      "epss": "0.00133",
      "percentile": "0.0313"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-8351\",\"sourceIdentifier\":\"security@nortonlifelock.com\",\"published\":\"2025-12-01T16:15:57.857\",\"lastModified\":\"2026-06-12T23:16:28.253\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Heap-based Buffer Overflow, Out-of-bounds Read vulnerability in Avira Antivirus engine when scanning a malformed file may allow Local Execution of Code or Denial-of-Service of the antivirus engine process.\\n\\nThis issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.70.98.\"},{\"lang\":\"es\",\"value\":\"Desbordamiento de b\u00fafer basado en mont\u00edculo, vulnerabilidad de lectura fuera de los l\u00edmites en Avast Antivirus en MacOS al escanear un archivo malformado puede permitir la ejecuci\u00f3n local de c\u00f3digo o la denegaci\u00f3n de servicio del proceso del motor del antivirus. Este problema afecta a Antivirus: desde 8.3.70.94 hasta 8.3.70.98.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security@nortonlifelock.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"security@nortonlifelock.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-122\"},{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"references\":[{\"url\":\"https://www.gendigital.com/us/en/contact-us/security-advisories/\",\"source\":\"security@nortonlifelock.com\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-8351\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-12-01T15:57:24.184526Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-12-01T15:58:22.538Z\"}}], \"cna\": {\"title\": \"Avira antivirus engine heap buffer OOB read when scanning a malformed file\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Mike Zhang, an independent security researcher\"}], \"impacts\": [{\"capecId\": \"CAPEC-549\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-549 Local Execution of Code\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"REQUIRED\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Gen Digital\", \"product\": \"Avira Antivirus\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"8.3.70.98\", \"versionType\": \"custom\"}], \"platforms\": [\"Windows\", \"macOS\", \"Linux\"], \"defaultStatus\": \"affected\"}], \"solutions\": [{\"lang\": \"en\", \"value\": \"Upgrade to Avira scan engine build 8.3.70.98 or any later engine release. Builds at or above 8.3.70.98 include the fix.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Upgrade to Avira scan engine build \u003cstrong\u003e8.3.70.98\u003c/strong\u003e or \u003cstrong\u003eany later\u003c/strong\u003e engine release. Builds at or above 8.3.70.98 include the fix.\", \"base64\": false}]}], \"datePublic\": \"2025-06-25T08:25:00.000Z\", \"references\": [{\"url\": \"https://www.gendigital.com/us/en/contact-us/security-advisories/\"}], \"x_generator\": {\"engine\": \"Vulnogram 1.0.2\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Heap-based Buffer Overflow, Out-of-bounds Read vulnerability in Avira Antivirus engine when scanning a malformed file may allow Local Execution of Code or Denial-of-Service of the antivirus engine process.\\n\\nThis issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.70.98.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Heap-based Buffer Overflow, Out-of-bounds Read vulnerability in Avira Antivirus engine when scanning a malformed file may allow Local Execution of Code or Denial-of-Service of the antivirus engine process.\u003cp\u003eThis issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.70.98.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-122\", \"description\": \"CWE-122 Heap-based Buffer Overflow\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"CWE-125 Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"dbd8429d-f261-4b1e-94cc-ae3132817e2e\", \"shortName\": \"GEN\", \"dateUpdated\": \"2026-06-12T22:32:51.689Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-8351\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-12T22:32:51.689Z\", \"dateReserved\": \"2025-07-30T11:48:44.820Z\", \"assignerOrgId\": \"dbd8429d-f261-4b1e-94cc-ae3132817e2e\", \"datePublished\": \"2025-12-01T15:51:42.044Z\", \"assignerShortName\": \"NLOK\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.