CVE-2021-30130: Debian Linux

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

phpseclib before 2.0.31 and 3.x before 3.0.7 mishandles RSA PKCS#1 v1.5 signature verification.

Affected products

• Debian Debian Linux: version 10.0 only
• Phpseclib Phpseclib: before 2.0.31 (fixed in 2.0.31); from 3.0, before 3.0.7 (fixed in 3.0.7)

Published 2021-04-06. Last modified 2026-06-17.