Out-of-bounds Read in Libav

CVE-2020-18775

In Libav 12.3, there is a heap-based buffer over-read in vc1_decode_b_mb_intfi in vc1_block.c that allows an attacker to cause denial-of-service via a crafted file.

Vulnerability class: Buffer Overflow

EPSS: 0.009 (55.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

  • Libav — versions 12.3
  • N/a — versions n/a

Weakness classification (CWE)

Public proof-of-concept exploits

References

  • cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC, Issue Tracking, Broken Link)
  • cve@mitre.org (Technical Description, x_refsource_MISC)

Frequently asked questions

What is CVE-2020-18775?
CVE-2020-18775 is a medium-severity vulnerability in Libav, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2021-08-23.
How severe is CVE-2020-18775?
Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2020-18775 known to be exploited?
2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.