CVE-2015-2929

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-01-24 · updated 2026-06-17

Description

The Hidden Service (HS) client implementation in Tor before 0.2.4.27, 0.2.5.x before 0.2.5.12, and 0.2.6.x before 0.2.6.7 allows remote servers to cause a denial of service (assertion failure and application exit) via a malformed HS descriptor.

Affected products

torproject Tor: before 0.2.4.27; from 0.2.5.1 before 0.2.5.12; from 0.2.6.1 before 0.2.6.7 — fixed in 0.2.4.27, 0.2.5.12, 0.2.6.7

How to fix

Upgrade to a fixed version: torproject Tor 0.2.4.27, 0.2.5.12, 0.2.6.7. Check the vendor advisory for mitigations.

References

http://openwall.com/lists/oss-security/2015/04/06/5
https://trac.torproject.org/projects/tor/ticket/15601
http://openwall.com/lists/oss-security/2015/04/06/5
https://trac.torproject.org/projects/tor/ticket/15601

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