CVE-2017-8819: Debian Linux

High severity, CVSS 7.5. EPSS: 1.4% 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, the replay-cache protection mechanism is ineffective for v2 onion services, aka TROVE-2017-009. An attacker can send many INTRODUCE2 cells to trigger this issue.

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.