Resource exhaustion in Torproject Tor
CVE-2021-34549
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.
Vulnerability class: DoS (Denial of Service)
EPSS: 0.016 (73.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Torproject Tor
- N/a — versions n/a
Weakness classification (CWE)
References
- cve@mitre.org (x_refsource_MISC, Broken Link)
- cve@mitre.org (x_refsource_CONFIRM, Release Notes, Vendor Advisory)
- cve@mitre.org (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)
Frequently asked questions
- What is CVE-2021-34549?
- CVE-2021-34549 is a high-severity vulnerability in Torproject Tor, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2021-06-29.
- How severe is CVE-2021-34549?
- High severity. CVSS v3 base score is 7.5 out of 10.