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CVE-2011-2768

Published: Dec 23, 2011Updated: Apr 29, 2026 Sources: CVE List NVDCWE-264
NVD MITRE
5.8CVSSMEDIUM
EPSS Score
0.8%
Top 49.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Tor before 0.2.2.34, when configured as a client or bridge, sends a TLS certificate chain as part of an outgoing OR connection, which allows remote relays to bypass intended anonymity properties by reading this chain and then determining the set of entry guards that the client or bridge had selected.

CVSS Vector Breakdown

AV:NAC:MAu:NC:PI:PA:N
Exploitability
AV:NAccess Vector
Network
AC:MAccess Complexity
Medium
Au:NAuthentication
None
Impact
C:PConfidentiality
Partial
I:PIntegrity
Partial
A:NAvailability
None
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Weaknesses

CWE-264

Affected Products

tortor
Mixed
Security Products / secure-gateway-vpn
n/an/a
toross-projectSecurity Productsaka tor project

Exploitability

Official Patch Available

References

http://www.debian.org/security/2011/dsa-2331
debian.org
https://blog.torproject.org/blog/tor-02234-released-security-patches
blog.torproject.org

Timeline

Published
Dec 23, 2011
Last Updated
Apr 29, 2026

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