CVE-2017-8820: Debian Linux

High severity, CVSS 7.5. EPSS: 1.7% 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, remote attackers can cause a denial of service (NULL pointer dereference and application crash) against directory authorities via a malformed descriptor, aka TROVE-2017-010.

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.