CVE-2019-9719

Name: CVE-2019-9719
Creator: NVD / NIST
Published: 2019-09-19T21:15:10.503+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 2.02%

Last modified Jun 17, 2026

CVE-2019-9719 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. A stack-based buffer overflow in the subtitle decoder in Libav 12.3 allows attackers to corrupt the stack via a crafted video file in Matroska format, because srt_to_ass in libavcodec/srtdec.c misuses snprintf. NOTE: Third parties dispute that this is a vulnerability because “no evidence of a vulnerability is provided” and only “a generic warning from a static code analysis” is provided. EPSS estimates a 2.02% chance of exploitation in the next 30 days.

Description

A stack-based buffer overflow in the subtitle decoder in Libav 12.3 allows attackers to corrupt the stack via a crafted video file in Matroska format, because srt_to_ass in libavcodec/srtdec.c misuses snprintf. NOTE: Third parties dispute that this is a vulnerability because “no evidence of a vulnerability is provided” and only “a generic warning from a static code analysis” is provided

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

2.02%

78.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Libav	Libav	<= 12.3

References

https://github.com/libav/libav/blob/df744e3cf66548c9167ea857104a29d2ea92819e/libavcodec/srtdec.c#L113Exploit, Third Party Advisory
https://github.com/libav/libav/commits/master/libavcodec/srtdec.cThird Party Advisory
https://lgtm.com/projects/g/libav/libav/snapshot/f5f553ca3bdca0c97dd08bbf002f0d8cb193788b/files/libavcodec/srtdec.c?sort=name&dir=ASC&mode=heatmap#xeec693aa6d85853b:1Exploit, Third Party Advisory
https://lgtm.com/security/Third Party Advisory
https://github.com/libav/libav/blob/df744e3cf66548c9167ea857104a29d2ea92819e/libavcodec/srtdec.c#L113Exploit, Third Party Advisory
https://github.com/libav/libav/commits/master/libavcodec/srtdec.cThird Party Advisory
https://lgtm.com/projects/g/libav/libav/snapshot/f5f553ca3bdca0c97dd08bbf002f0d8cb193788b/files/libavcodec/srtdec.c?sort=name&dir=ASC&mode=heatmap#xeec693aa6d85853b:1Exploit, 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-2019-9719?

How severe is CVE-2019-9719?

CVE-2019-9719 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.02% probability of exploitation in the next 30 days.

How do I fix CVE-2019-9719?

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-2019-9719?

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

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Source: NVD / NIST