What’s Vulnerable › Vulnerabilities

CVE-2020-24994

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-03-23 · updated 2026-06-17
• Weakness: CWE-770

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.

Affected products

• Libass Project Libass: before 0.15.0 — fixed in 0.15.0

How to fix

Upgrade to a fixed version: Libass Project Libass 0.15.0. Check the vendor advisory for mitigations.

References

• https://github.com/libass/libass/commit/6835731c2fe4164a0c50bc91d12c43b2a2b4e
• https://github.com/libass/libass/issues/422
• https://github.com/libass/libass/issues/422#issuecomment-806002919
• https://github.com/libass/libass/issues/423
• https://github.com/libass/libass/commit/6835731c2fe4164a0c50bc91d12c43b2a2b4e
• https://github.com/libass/libass/issues/422
• https://github.com/libass/libass/issues/422#issuecomment-806002919
• https://github.com/libass/libass/issues/423

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