TI-2020-13475 Aliases CVE-2020-18778 GHSA-gm8p-5337-8j5p

In Libav 12.3, there is a heap-based buffer over-read in vc1_decode_p_mb_intfi in…

LOW 31CWE-125Published 2021-08-23 · Updated 2024-08-04

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 heap-based buffer over-read in vc1_decode_p_mb_intfi in vc1_block.c that allows an attacker to cause denial-of-service via a crafted file.

Why it matters now

EPSS 0.00886 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

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:libav:libav:12.3:::::::*	12.3	Vulnerable	Libav

cpe:2.3:a:libav:libav:12.3:*:*:*:*:*:*:* Versions 12.3 Vulnerable ·Libav

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2020-18778
2026-10-03 Alias added: GHSA-gm8p-5337-8j5p

References

Exploit 1

https://bugzilla.libav.org/show_bug.cgi?id=1155

Other 1

https://cwe.mitre.org/data/definitions/126.html

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

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