CVE-2015-2689

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via crafted packets.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-20

Affected software

Vendor	Product	Versions
The Tor Project	Tor	before 0.2.4.26; 0.2.5.x before 0.2.5.11

References

https://lists.torproject.org/pipermail/tor-talk/2015-March/037281.htmlMailing List, Vendor Advisory
https://trac.torproject.org/projects/tor/ticket/14129Patch, Vendor Advisory
https://lists.torproject.org/pipermail/tor-talk/2015-March/037281.htmlMailing List, Vendor Advisory
https://trac.torproject.org/projects/tor/ticket/14129Patch, Vendor Advisory

Timeline

Published: Jan 24, 2020
Last modified: Jun 17, 2026
NVD status: Modified

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