CVE-2021-39564: Swftools

High severity, CVSS 7.8. EPSS: 1.1% chance of exploitation in the next 30 days.

An issue was discovered in swftools through 20200710. A heap-buffer-overflow exists in the function swf_DumpActions() located in swfaction.c. It allows an attacker to cause code Execution.

Affected products

• Swftools Swftools: up to and including 2020-07-10

Published 2021-09-20. Last modified 2026-06-17.