CVE-2019-17539 — In FFmpeg before 4

In FFmpeg before 4.2, avcodec_open2 in libavcodec/utils.c allows a NULL pointer dereference and possibly unspecified other impact when there is no valid close function pointer.

01What is this vulnerability?

In FFmpeg before 4.2, avcodec_open2 in libavcodec/utils.c allows a NULL pointer dereference and possibly unspecified other impact when there is no valid close function pointer.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-10-14T01:09:40.000Z
• Last modified: 2024-08-05T01:40:15.806Z

09References

• github.com — https://github.com/FFmpeg/FFmpeg/commit/8df6884832ec413cf032dfaa45c23b1c7876670c
• bugs.chromium.org — https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=15733
• security.gentoo.org — https://security.gentoo.org/glsa/202003-65
• www.debian.org — https://www.debian.org/security/2020/dsa-4722
• usn.ubuntu.com — https://usn.ubuntu.com/4431-1/
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2021/01/msg00026.html