CVE-2019-9717

Name: CVE-2019-9717
Creator: NVD / NIST
Published: 2019-09-19T21:15:10.44+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.28%

Last modified Jun 17, 2026

CVE-2019-9717 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. In Libav 12.3, a denial of service in the subtitle decoder allows attackers to hog the CPU via a crafted video file in Matroska format, because srt_to_ass in libavcodec/srtdec.c has a complex format argument to sscanf.. EPSS estimates a 1.28% chance of exploitation in the next 30 days.

Description

In Libav 12.3, a denial of service in the subtitle decoder allows attackers to hog the CPU via a crafted video file in Matroska format, because srt_to_ass in libavcodec/srtdec.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

1.28%

66.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Libav	Libav	<= 12.3

References

https://github.com/libav/libav/blob/df744e3cf66548c9167ea857104a29d2ea92819e/libavcodec/srtdec.c#L90Exploit, Third Party Advisory
https://lgtm.com/security/Third Party Advisory
https://github.com/libav/libav/blob/df744e3cf66548c9167ea857104a29d2ea92819e/libavcodec/srtdec.c#L90Exploit, Third Party Advisory
https://lgtm.com/security/Third Party Advisory

Timeline

Published: Sep 19, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-9717?

How severe is CVE-2019-9717?

CVE-2019-9717 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.28% probability of exploitation in the next 30 days.

How do I fix CVE-2019-9717?

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-2019-9717?

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

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Source: NVD / NIST