CVE-2017-9996 — The cdxl_decode_frame function in libavcodec/cdxl

The cdxl_decode_frame function in libavcodec/cdxl.c in FFmpeg 2.8.x before 2.8.12, 3.0.x before 3.0.8, 3.1.x before 3.1.8, 3.2.x before 3.2.5, and 3.3.x before 3.3.1 does not exclude the CHUNKY format, which allows remote attackers to cause a denial of service (heap-based buffer

01What is this vulnerability?

The cdxl_decode_frame function in libavcodec/cdxl.c in FFmpeg 2.8.x before 2.8.12, 3.0.x before 3.0.8, 3.1.x before 3.1.8, 3.2.x before 3.2.5, and 3.3.x before 3.3.1 does not exclude the CHUNKY format, which allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted file.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

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: 2017-06-28T06:29:00.613
• Last modified: 2026-05-13T00:24:29.033

09References

• www.securityfocus.com — http://www.securityfocus.com/bid/99323
• bugs.chromium.org — https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1378
• bugs.chromium.org — https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1427
• github.com — https://github.com/FFmpeg/FFmpeg/commit/1e42736b95065c69a7481d0cf55247024f54b660
• github.com — https://github.com/FFmpeg/FFmpeg/commit/e1b60aad77c27ed5d4dfc11e5e6a05a38c70489d
• www.securityfocus.com — http://www.securityfocus.com/bid/99323
• bugs.chromium.org — https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1378
• bugs.chromium.org — https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1427
• github.com — https://github.com/FFmpeg/FFmpeg/commit/1e42736b95065c69a7481d0cf55247024f54b660
• github.com — https://github.com/FFmpeg/FFmpeg/commit/e1b60aad77c27ed5d4dfc11e5e6a05a38c70489d