CVE-2011-0491
MEDIUM · CVSS 5.0EPSS 2.5%EU EUVD
The tor_realloc function in Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha does not validate a certain size value during memory allocation, which might allow remote attackers to cause a denial of service (daemon crash) via unspecified vectors, related to "underflow errors."
Key facts
- CVSS score
- 5.0 (v2.0)
- Severity
- MEDIUM
- CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P- Weakness (CWE)
- CWE-20
- EPSS score
- 2.5% (85th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2011-0511)
- Published
- January 19, 2011
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2011-0511 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.
View on the EU Vulnerability DatabaseAffected products
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
- tor / tor
and 157 more…
References
- http://archives.seul.org/or/announce/Jan-2011/msg00000.html(Patch)
- http://blog.torproject.org/blog/tor-02129-released-security-patches(Patch, Vendor Advisory)
- http://www.securityfocus.com/bid/45953
- https://exchange.xforce.ibmcloud.com/vulnerabilities/64888
- https://gitweb.torproject.org/tor.git/blob/refs/heads/release-0.2.2:/ChangeLog(Patch)
- https://trac.torproject.org/projects/tor/ticket/2324
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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