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

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MEDIUM

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 Jul 5, 2018

6.5

MEDIUM

CVSS 3.0

EPSS 1.41%

Description

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.

Affected products

Remediation

No remediation recorded yet.

Metrics

1.41% 0.01408

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.

EPSS probability 0.01408

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Table of values (9 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 3, 2026	1.41% (0.01408)	71.69th	v5 (v2026.06.15)
Sep 20, 2026	1.41% (0.01408)	71.43th	v5 (v2026.06.15)
Jul 20, 2024	0.08% (0.00078)	34.39th	v3 (v2023.03.01)
Nov 26, 2023	0.08% (0.00080)	33.55th	v3 (v2023.03.01)
Mar 7, 2023	0.09% (0.00094)	38.35th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00885)	27.89th	v2 (v2022.01.01)
Feb 4, 2022	0.89% (0.00885)	10.50th	v2 (v2022.01.01)
Feb 3, 2022	0.78% (0.00777)	21.50th	v5 (v2026.06.15)
Apr 14, 2021	0.78% (0.00777)	0.00th	v1

Weaknesses (1)

CWE-476

NULL Pointer Dereference

References (2)

http://www.securityfocus.com/bid/104675
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
https://github.com/FFmpeg/FFmpeg/commit/00e8181bd97c834fe60751b0c511d4bb97875f78
x_refsource_MISCPatch

Link	Providers	Tags
http://www.securityfocus.com/bid/104675		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
https://github.com/FFmpeg/FFmpeg/commit/00e8181bd97c834fe60751b0c511d4bb97875f78		x_refsource_MISCPatch

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner mitre

Published Jul 5, 2018

Updated Aug 5, 2024

Reserved Jul 5, 2018

Link CVE-2018-13303

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2018-13303

Red Hat

Severity n/a

Public date n/a

Links CVE-2018-13303