CVE-2011-0493
Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha might allow remote attackers to cause a...
CVE-2011-0493 is a medium vulnerability (CVSS 5.0) in Tor, published January 17, 2011. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.52%, the 85th percentile. Fixed in tor 0.2.1.29-1.
- Severity
- 5.0 MediumCVSS 2.0, NVD
- Exploit chance
- 2.52%EPSS, 85th percentile
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
0.2.1.29-1tor +3 more
Description
Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha might allow remote attackers to cause a denial of service (assertion failure and daemon exit) via vectors related to malformed router caches and improper handling of integer values.
Exploit likelihood
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
torDebian:12 | before 0.2.1.29-1 | 0.2.1.29-1 |
torDebian:13 | before 0.2.1.29-1 | 0.2.1.29-1 |
torDebian:14 | before 0.2.1.29-1 | 0.2.1.29-1 |
torDebian:5.0 From an advisory covering 7 CVEs | before 0.2.1.29-1~lenny+1, plus listed versions 0.2.0.33-10.2.0.34-10.2.0.34-1~bpo40+10.2.0.35-10.2.0.35-1~lenny1 Show 45 moreShow less0.2.0.35-1~lenny20.2.1.10-alpha-10.2.1.11-alpha-10.2.1.12-alpha-10.2.1.13-alpha-10.2.1.14-rc-10.2.1.15-rc-10.2.1.16-rc-10.2.1.17-rc-10.2.1.18-10.2.1.19-10.2.1.2-alpha-10.2.1.20-10.2.1.20-20.2.1.21-10.2.1.21-1~bpo50+10.2.1.22-10.2.1.22-1~bpo50+10.2.1.23-10.2.1.23-20.2.1.25-10.2.1.25-1~bpo50+10.2.1.25-20.2.1.25-30.2.1.26-10.2.1.26-1~bpo50+10.2.1.26-1~lenny+10.2.1.26-1~lenny+20.2.1.26-1~lenny+40.2.1.26-1~lennyvolatile10.2.1.26-1~lennyvolatile20.2.1.26-20.2.1.26-30.2.1.26-40.2.1.26-4~bpo50+10.2.1.26-50.2.1.26-60.2.1.26-6~bpo50+10.2.1.4-alpha-10.2.1.5-alpha-10.2.1.6-alpha-10.2.1.7-alpha-10.2.1.7-alpha-20.2.1.8-alpha-10.2.1.9-alpha-1 | 0.2.1.29-1~lenny+1 |
What each source reports
NVD Score used
Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha might allow remote attackers to cause a denial of service (assertion failure and daemon exit) via vectors related to malformed router caches and improper handling of integer values.
- Record
CVE-2011-0493- CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-189
- Updated
- 2026-11-02
CVE ListNo score
Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha might allow remote attackers to cause a denial of service (assertion failure and daemon exit) via vectors related to malformed router caches and improper handling of integer values.
- Record
CVE-2011-0493- Updated
- 2026-11-02
EUVDEUVD-2011-0513No score
Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha might allow remote attackers to cause a denial of service (assertion failure and daemon exit) via vectors related to malformed router caches and improper handling of integer values.
- Record
EUVD-2011-0513- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-r4gp-h7pq-qx3wNo score
Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha might allow remote attackers to cause a...
Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha might allow remote attackers to cause a denial of service (assertion failure and daemon exit) via vectors related to malformed router caches and improper handling of integer values.
- Record
GHSA-r4gp-h7pq-qx3w- Updated
- 2026-11-02
OSVNo score
Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha might allow remote attackers to cause a denial of service (assertion failure and daemon exit) via vectors related to malformed router caches and improper handling of integer values.
- Record
CVE-2011-0493- Updated
- 2026-11-02
OSVDEBIAN-CVE-2011-0493No score
Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha might allow remote attackers to cause a denial of service (assertion failure and daemon exit) via vectors related to malformed router caches and improper handling of integer values.
- Record
DEBIAN-CVE-2011-0493- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
References
archives.seul.org/or/announce/Jan-2011/msg00000.html
gitweb.torproject.org/tor.git/blob/refs/heads/release-0.2.2:/ChangeLog
trac.torproject.org/projects/tor/ticket/2352
blog.torproject.org/blog/tor-02129-released-security-patches
exchange.xforce.ibmcloud.com/vulnerabilities/64864
securityfocus.com/bid/45953
nvd.nist.gov/vuln/detail/CVE-2011-0493
github.com/advisories/GHSA-r4gp-h7pq-qx3w
security-tracker.debian.org/tracker/CVE-2011-0493