CVE-2011-4895
Tor before 0.2.2.34, when configured as a bridge, sets up circuits through a process different...
CVE-2011-4895 is a medium vulnerability (CVSS 4.3) in Tor, published December 23, 2011. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.53%, the 74th percentile. Fixed in tor 0.2.2.34-1.
Tor before 0.2.2.34, when configured as a bridge, sets up circuits through a process different from the process used by a client, which makes it easier for remote attackers to enumerate bridges by observing circuit building.
Exploit likelihood
What each source reports
NVD Score used
Tor before 0.2.2.34, when configured as a bridge, sets up circuits through a process different from the process used by a client, which makes it easier for remote attackers to enumerate bridges by observing circuit building.
- Record
CVE-2011-4895- CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:P/I:N/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
CVE List No score
Tor before 0.2.2.34, when configured as a bridge, sets up circuits through a process different from the process used by a client, which makes it easier for remote attackers to enumerate bridges by observing circuit building.
- Record
CVE-2011-4895- Updated
- 2026-11-02
EUVDEUVD-2011-4812 No score
Tor before 0.2.2.34, when configured as a bridge, sets up circuits through a process different from the process used by a client, which makes it easier for remote attackers to enumerate bridges by observing circuit building.
- Record
EUVD-2011-4812- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-vv8x-qxvx-9wjx No score
Tor before 0.2.2.34, when configured as a bridge, sets up circuits through a process different...
Tor before 0.2.2.34, when configured as a bridge, sets up circuits through a process different from the process used by a client, which makes it easier for remote attackers to enumerate bridges by observing circuit building.
- Record
GHSA-vv8x-qxvx-9wjx- Weakness
- CWE-200
- Updated
- 2026-11-02
OSV No score
Tor before 0.2.2.34, when configured as a bridge, sets up circuits through a process different from the process used by a client, which makes it easier for remote attackers to enumerate bridges by observing circuit building.
- Record
CVE-2011-4895- Updated
- 2026-11-02
OSVDEBIAN-CVE-2011-4895 No score
Tor before 0.2.2.34, when configured as a bridge, sets up circuits through a process different from the process used by a client, which makes it easier for remote attackers to enumerate bridges by observing circuit building.
- Record
DEBIAN-CVE-2011-4895- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:10423-1 No score
tor-0.2.8.11-1.1 on GA media
These are all security issues fixed in the tor-0.2.8.11-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:10423-1- Updated
- 2026-11-02
Affected products
Affected packages
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-03 | aliases | EUVD |
| 2026-11-02 | created | CVE List, GitHub Advisories, NVD, OSV |
References
blog.torproject.org/blog/tor-02234-released-security-patches
nvd.nist.gov/vuln/detail/CVE-2011-4895
github.com/advisories/GHSA-vv8x-qxvx-9wjx
security-tracker.debian.org/tracker/CVE-2011-4895
suse.com/security/cve/CVE-2011-0427
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