CVE-2020-24994

Name: CVE-2020-24994
Creator: NVD / NIST
Published: 2021-03-23T20:15:13.073+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 2.63%

Last modified Jun 17, 2026

CVE-2020-24994 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Stack overflow in the parse_tag function in libass/ass_parse.c in libass before 0.15.0 allows remote attackers to cause a denial of service or remote code execution via a crafted file.. EPSS estimates a 2.63% chance of exploitation in the next 30 days.

Description

Stack overflow in the parse_tag function in libass/ass_parse.c in libass before 0.15.0 allows remote attackers to cause a denial of service or remote code execution via a crafted file.

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

2.63%

83.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

Affected Software

Vendor	Product	Versions
Libass Project	Libass	< 0.15.0

References

https://github.com/libass/libass/commit/6835731c2fe4164a0c50bc91d12c43b2a2b4ePatch, Third Party Advisory
https://github.com/libass/libass/issues/422Patch, Third Party Advisory
https://github.com/libass/libass/issues/422#issuecomment-806002919Issue Tracking, Patch, Third Party Advisory
https://github.com/libass/libass/issues/423Third Party Advisory
https://github.com/libass/libass/commit/6835731c2fe4164a0c50bc91d12c43b2a2b4ePatch, Third Party Advisory
https://github.com/libass/libass/issues/422Patch, Third Party Advisory
https://github.com/libass/libass/issues/422#issuecomment-806002919Issue Tracking, Patch, Third Party Advisory
https://github.com/libass/libass/issues/423Third Party Advisory

Timeline

Published: Mar 23, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-24994?

Stack overflow in the parse_tag function in libass/ass_parse.c in libass before 0.15.0 allows remote attackers to cause a denial of service or remote code execution via a crafted file.

How severe is CVE-2020-24994?

CVE-2020-24994 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.63% probability of exploitation in the next 30 days.

How do I fix CVE-2020-24994?

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-2020-24994?

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

Scan your code now

Source: NVD / NIST