CVE-2019-9718

Name: CVE-2019-9718
Creator: NVD / NIST
Published: 2019-03-12T09:29:00.53+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.57%

Last modified Jun 17, 2026

CVE-2019-9718 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. In FFmpeg 3.2 and 4.1, a denial of service in the subtitle decoder allows attackers to hog the CPU via a crafted video file in Matroska format, because ff_htmlmarkup_to_ass in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.. EPSS estimates a 1.57% chance of exploitation in the next 30 days.

Description

In FFmpeg 3.2 and 4.1, a denial of service in the subtitle decoder allows attackers to hog the CPU via a crafted video file in Matroska format, because ff_htmlmarkup_to_ass in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS Probability

1.57%

72.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Ffmpeg	Ffmpeg	3.2
Ffmpeg	Ffmpeg	4.1
Debian	Debian Linux	9.0
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	18.10
Canonical	Ubuntu Linux	19.04

References

http://www.securityfocus.com/bid/107382Broken Link
https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/1f00c97bc3475c477f3c468cf2d924d5761d0982Patch, Third Party Advisory
https://github.com/FFmpeg/FFmpeg/commit/23ccf3cabb4baf6e8af4b1af3fcc59c904736f21Patch, Third Party Advisory
https://seclists.org/bugtraq/2019/May/60Mailing List, Third Party Advisory
https://usn.ubuntu.com/3967-1/Third Party Advisory
https://www.debian.org/security/2019/dsa-4449Third Party Advisory
http://www.securityfocus.com/bid/107382Broken Link
https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/1f00c97bc3475c477f3c468cf2d924d5761d0982Patch, Third Party Advisory
https://github.com/FFmpeg/FFmpeg/commit/23ccf3cabb4baf6e8af4b1af3fcc59c904736f21Patch, Third Party Advisory
https://seclists.org/bugtraq/2019/May/60Mailing List, Third Party Advisory
https://usn.ubuntu.com/3967-1/Third Party Advisory
https://www.debian.org/security/2019/dsa-4449Third Party Advisory

Timeline

Published: Mar 12, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-9718?

How severe is CVE-2019-9718?

CVE-2019-9718 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.57% probability of exploitation in the next 30 days.

How do I fix CVE-2019-9718?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-9718?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST