What’s Vulnerable › Vulnerabilities
CVE-2017-8822
- Severity: low (CVSS 3.7 v3.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.9% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2017-12-03 · updated 2026-06-17
- Weakness: CWE-417
Description
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, relays (that have incompletely downloaded descriptors) can pick themselves in a circuit path, leading to a degradation of anonymity, aka TROVE-2017-012.
Affected products
- Debian Linux: 8.0, 9.0
- Tor Project Tor: before 0.2.5.16; from 0.2.6 before 0.2.8.17; from 0.2.9 before 0.2.9.14; from 0.3.0 before 0.3.0.13; from 0.3.1 before 0.3.1.9 — fixed in 0.2.5.16, 0.2.8.17, 0.2.9.14, 0.3.0.13, 0.3.1.9
How to fix
Upgrade to a fixed version: Tor Project Tor 0.2.5.16, 0.2.8.17, 0.2.9.14, 0.3.0.13. Check the vendor advisory for mitigations.
References
- https://blog.torproject.org/new-stable-tor-releases-security-fixes-0319-03013-02914-02817-02516
- https://bugs.torproject.org/21534
- https://bugs.torproject.org/24333
- https://www.debian.org/security/2017/dsa-4054
- https://blog.torproject.org/new-stable-tor-releases-security-fixes-0319-03013-02914-02817-02516
- https://bugs.torproject.org/21534
- https://bugs.torproject.org/24333
- https://www.debian.org/security/2017/dsa-4054
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