CVE-2018-15822 — The flv_write_packet function in libavformat/flvenc

The flv_write_packet function in libavformat/flvenc.c in FFmpeg through 2.8 does not check for an empty audio packet, leading to an assertion failure.

01What is this vulnerability?

The flv_write_packet function in libavformat/flvenc.c in FFmpeg through 2.8 does not check for an empty audio packet, leading to an assertion failure.

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: 2018-08-23T22:00:00.000Z
• Last modified: 2024-08-05T10:01:54.691Z

09References

• github.com — https://github.com/FFmpeg/FFmpeg/commit/6b67d7f05918f7a1ee8fc6ff21355d7e8736aa10
• usn.ubuntu.com — https://usn.ubuntu.com/3967-1/
• seclists.org — https://seclists.org/bugtraq/2019/May/60
• www.debian.org — https://www.debian.org/security/2019/dsa-4449
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2019/05/msg00043.html
• usn.ubuntu.com — https://usn.ubuntu.com/4431-1/
• github.com — https://github.com/FFmpeg/FFmpeg/commit/d8ecb335fe4852bbc172c7b79e66944d158b4d92