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CVE-2017-16840

Status: ModifiedCritical (9.8)—
Severity9.8Critical · CVSS 3.1
Exploitation probability3.33 %higher than 89% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

The VC-2 Video Compression encoder in FFmpeg 3.0 and 3.4 allows remote attackers to cause a denial of service (out-of-bounds read) because of incorrect buffer padding for non-Haar wavelets, related to libavcodec/vc2enc.c and libavcodec/vc2enc_dwt.c.

CVSS

Base score
9.8
Version
3.1
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
3.33 %
Percentile among all scored CVEs
89
Score date
10/21/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (2)

Debian — Debian LinuxFfmpeg — Ffmpeg

CWEs

References

Show 8 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2017-16840",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 7.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      }
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  },
  "affected": [
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      "affectedData": [
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          "vendor": "n/a",
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          "versions": [
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              "status": "affected",
              "version": "n/a"
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  "published": "2017-11-21T08:29:00.210",
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      "url": "http://git.videolan.org/?p=ffmpeg.git%3Ba=commit%3Bh=a94cb36ab2ad99d3a1331c9f91831ef593d94f74",
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    },
    {
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      "tags": [
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        "Third Party Advisory"
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      "source": "cve@mitre.org"
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      "tags": [
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      "source": "cve@mitre.org"
    },
    {
      "url": "http://git.videolan.org/?p=ffmpeg.git%3Ba=commit%3Bh=a94cb36ab2ad99d3a1331c9f91831ef593d94f74",
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      "tags": [
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    },
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      "tags": [
        "Vendor Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The VC-2 Video Compression encoder in FFmpeg 3.0 and 3.4 allows remote attackers to cause a denial of service (out-of-bounds read) because of incorrect buffer padding for non-Haar wavelets, related to libavcodec/vc2enc.c and libavcodec/vc2enc_dwt.c."
    },
    {
      "lang": "es",
      "value": "El codificador VC-2 Video Compression en FFmpeg versión 3.0 y 3.4 permite que los atacantes remotos provoquen una denegación de servicio (lectura fuera de límites) debido a un relleno incorrecto del búfer para wavelets que no son de Haar. Esto está relacionado con libavcodec/vc2enc.c y libavcodec/vc2enc_dwt.c"
    }
  ],
  "lastModified": "2026-06-17T01:10:00.190",
  "configurations": [
    {
      "nodes": [
        {
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          "cpeMatch": [
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            },
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              "matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252"
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          ],
          "operator": "OR"
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  "sourceIdentifier": "cve@mitre.org"
}