CVE-2017-8821: Debian Linux

High severity, CVSS 7.5. EPSS: 2% chance of exploitation in the next 30 days.

In Tor before 0.2.5.16, 0.2.6 through 0.2.8 before 0.2.8.17, 0.2.9 before 0.2.9.14, 0.3.0 before 0.3.0.13, and 0.3.1 before 0.3.1.9, an attacker can cause a denial of service (application hang) via crafted PEM input that signifies a public key requiring a password, which triggers an attempt by the OpenSSL library to ask the user for the password, aka TROVE-2017-011.

Affected products

• Debian Debian Linux: version 8.0 only; version 9.0 only
• Tor Project Tor: before 0.2.5.16 (fixed in 0.2.5.16); from 0.2.6, before 0.2.8.17 (fixed in 0.2.8.17); from 0.2.9, before 0.2.9.14 (fixed in 0.2.9.14); from 0.3.0, before 0.3.0.13 (fixed in 0.3.0.13); from 0.3.1, before 0.3.1.9 (fixed in 0.3.1.9)

Published 2017-12-03. Last modified 2026-06-17.