VulnerabilityModified
CVE-2021-34549
Consequently. an attacker can trigger the use of an attacker-chosen circuit ID to cause algorithm inefficiency.
HIGH 7.5EPSS 1.61%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.61%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.61% probability · 75th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-400
- Affected
- torproject/tor
- Source
- cve@mitre.org
References
- https://blog.torproject.org/node/2041Release Notes, Vendor Advisory
- https://gitlab.torproject.org/tpo/core/tor/-/issues/40391Broken Link
- https://security.gentoo.org/glsa/202107-25Third Party Advisory
- https://blog.torproject.org/node/2041Release Notes, Vendor Advisory
- https://gitlab.torproject.org/tpo/core/tor/-/issues/40391Broken Link
- https://security.gentoo.org/glsa/202107-25Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.