VULNERABILITY INTELLIGENCE

CVE-2015-2689

CVSS score7.5 HIGH

EPSS probability2.19%

CISA KEVNot currently listed

Published2020-01-24

Last modified2026-06-17

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

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.

Weakness classification

CWE-20: Improper Input Validation

Primary references

security@debian.org — Mailing List, Vendor Advisory
security@debian.org — Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Patch, Vendor Advisory