CVE-2021-42203: Swftools

High severity, CVSS 7.8. EPSS: 1.2% chance of exploitation in the next 30 days.

An issue was discovered in swftools through 20201222. A heap-use-after-free exists in the function swf_FontExtract_DefineTextCallback() located in swftext.c. It allows an attacker to cause code execution.

Affected products

• Swftools Swftools: up to and including 2020-12-22

Published 2022-06-02. Last modified 2026-06-17.