Read the docs
TI-2020-13474 Aliases CVE-2020-18776GHSA-2wm2-q986-vfw5

In Libav 12.3, there is a segmentation fault in vc1_decode_b_mb_intfr in vc1_block.c that…

Priority LOW 30CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-125 and the CVSS impact.

Summary

In Libav 12.3, there is a segmentation fault in vc1_decode_b_mb_intfr in vc1_block.c that allows an attacker to cause denial-of-service via a crafted file.

Why it matters now

EPSS 0.00877 59th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:libav:libav:12.3:*:*:*:*:*:*:*12.3VulnerableLibav
  • cpe:2.3:a:libav:libav:12.3:*:*:*:*:*:*:* Versions 12.3 Vulnerable ·Libav

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-18776
  2. 2026-10-03 Alias added: GHSA-2wm2-q986-vfw5

References

Exploit 1

  • TI-2025-07863 libav MPEG File Parser utils.c ff_seek_frame_binary null pointer dereference CVSS 4.0MEDIUM 4.8
  • TI-2025-07862 libav DSS File Demuxer avconv.c main double free CVSS 4.0MEDIUM 4.8
  • TI-2025-07861 libav AVI File Parser buffer.c av_buffer_unref null pointer dereference CVSS 4.0MEDIUM 4.8
  • TI-2014-03250 Multiple unspecified vulnerabilities in Libav before 0.8.12 allow remote attackers to have unknown impact and vectors. CVSS 2.0HIGH 10.0
  • TI-2012-04335 Google Chrome before 23.0.1271.97, and Libav 0.7.x before 0.7.7 and 0.8.x before 0.8.5… CVSS 2.0HIGH 10.0
  • TI-2012-02425 Double free vulnerability in the mpeg_decode_frame function in libavcodec/mpeg12.c in… CVSS 2.0HIGH 10.0
See all 107 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences