CVE-2021-34549
HIGHCVSS 7.5/10EPSS 1.61%
Last modified
CVE-2021-34549 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-005. Hashing is mishandled for certain retrieval of circuit data. EPSS estimates a 1.61% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Torproject | Tor | < 0.3.5.15 |
| Torproject | Tor | >= 0.4.0.0, < 0.4.4.9 |
| Torproject | Tor | >= 0.4.5.0, < 0.4.5.9 |
| Torproject | Tor | >= 0.4.6.0, < 0.4.6.5 |
References
- https://blog.torproject.org/node/2041Release Notes, Vendor Advisory
- https://security.gentoo.org/glsa/202107-25Third Party Advisory
- https://blog.torproject.org/node/2041Release Notes, Vendor Advisory
- https://security.gentoo.org/glsa/202107-25Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2021-34549?
CVE-2021-34549 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.61% probability of exploitation in the next 30 days.
How do I fix CVE-2021-34549?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2021-34549?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST