What is CVE-2018-13303?

CVE-2018-13303 is a medium-severity vulnerability in Ffmpeg, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2018-07-05.

How severe is CVE-2018-13303?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Is CVE-2018-13303 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

NULL pointer dereference in Ffmpeg

CVE-2018-13303

In FFmpeg 4.0.1, a missing check for failure of a call to init_get_bits8() in the avpriv_ac3_parse_header function in libavcodec/ac3_parser.c may trigger a NULL pointer dereference while converting a crafted AVI file to MPEG4, leading to a denial of service.

Published 2018-07-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.014 (71.5th percentile), scored 2026-09-28.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 71.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: -0.000

Affected products

Ffmpeg — versions 4.0.1

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

Public proof-of-concept exploits

References

www.securityfocus.com/bid/104675 (VDB Entry, Third Party Advisory, vdb-entry)
github.com/FFmpeg/FFmpeg/commit/00e8181bd97c834fe60751b0c511d4bb97875f78 (Patch)

Frequently asked questions

What is CVE-2018-13303?: CVE-2018-13303 is a medium-severity vulnerability in Ffmpeg, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2018-07-05.
How severe is CVE-2018-13303?: Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2018-13303 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.