CVE-2021-34549
HIGHTor < 0.3.5.15 - Uncontrolled Resource Consumption via Circuit ID Hashing
Title source: llmDescription
An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-005. Hashing is mishandled for certain retrieval of circuit data. Consequently. an attacker can trigger the use of an attacker-chosen circuit ID to cause algorithm inefficiency.
References (3)
Core 3
Core References
Broken Link x_refsource_misc
https://gitlab.torproject.org/tpo/core/tor/-/issues/40391
Release Notes, Vendor Advisory x_refsource_confirm
https://blog.torproject.org/node/2041
Third Party Advisory vendor-advisory
x_refsource_gentoo
https://security.gentoo.org/glsa/202107-25
Scores
CVSS v3
7.5
EPSS
0.0161
EPSS Percentile
72.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-400
Status
published
Products (1)
torproject/tor
< 0.3.5.15
Published
Jun 29, 2021
Tracked Since
Feb 18, 2026