CVE-2021-34549
7.5
HIGH
CVSS 3.1
EPSS 0.64%
Description
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.
How to fix CVE-2021-34549
To remediate CVE-2021-34549, upgrade the affected package to a fixed version below.
- Debian/tor—upgrade to 0.4.5.9-1 or later
Is CVE-2021-34549 being exploited?
Low — EPSS is 0.6%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 0.4.5.9-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |