Resource exhaustion in Torproject Tor
CVE-2021-28089
Tor before 0.4.5.7 allows a remote participant in the Tor directory protocol to exhaust CPU resources on a target, aka TROVE-2021-001.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.017 (75.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 75.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000
Affected products
- Torproject Tor — versions 0.4.4.0, 0.4.4.1, 0.4.4.2
- Fedoraproject Fedora — versions 33
Weakness classification (CWE)
References
- gitlab.torproject.org/tpo/core/tor/-/issues/40304 (Vendor Advisory)
- blog.torproject.org/node/2009 (Release Notes, Vendor Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- security.gentoo.org/glsa/202107-25 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-28089?
- CVE-2021-28089 is a high-severity vulnerability in Torproject Tor, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2021-03-19.
- How severe is CVE-2021-28089?
- High severity. CVSS v3 base score is 7.5 out of 10.