Vulnerability · Published Jun 29, 2021 · Assigned by mitre
CVE-2021-34549
High 7.5
In plain English
A high-severity security flaw in the tor package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.6% (higher than 76% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)1.6%top 24.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | tor | 0.4.5.9-1 | DEBIAN-CVE-2021-34549 |
| Debian:13 | tor | 0.4.5.9-1 | DEBIAN-CVE-2021-34549 |
| Debian:14 | tor | 0.4.5.9-1 | DEBIAN-CVE-2021-34549 |
Affected products (as reported)
References
- https://gitlab.torproject.org/tpo/core/tor/-/issues/40391 x_refsource_MISC
- https://blog.torproject.org/node/2041 x_refsource_CONFIRM
- GLSA-202107-25 vendor-advisory, x_refsource_GENTOO