CVE-2021-38385: Torproject Tor

High severity, CVSS 7.5. EPSS: 1.7% chance of exploitation in the next 30 days.

Tor before 0.3.5.16, 0.4.5.10, and 0.4.6.7 mishandles the relationship between batch-signature verification and single-signature verification, leading to a remote assertion failure, aka TROVE-2021-007.

Affected products

• Torproject Tor: before 0.3.5.16 (fixed in 0.3.5.16); from 0.4.0.0, before 0.4.5.10 (fixed in 0.4.5.10); from 0.4.6.0, before 0.4.6.7 (fixed in 0.4.6.7)

Published 2021-08-30. Last modified 2026-06-17.