kbrain

CVE-2011-2768

MEDIUM · CVSS 5.8EPSS 0.7%EU EUVD

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.

Key facts

CVSS score
5.8 (v2.0)
Severity
MEDIUM
CVSS vector
AV:N/AC:M/Au:N/C:P/I:P/A:N
Weakness (CWE)
CWE-264
EPSS score
0.7% (54th percentile)
In CISA KEV
No
In EU EUVD
Yes (EUVD-2011-2742)
Published
December 23, 2011
NVD last modified
June 16, 2026
Status
Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2011-2742 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

  • tor / tor
  • tor / tor
  • tor / tor
  • tor / tor
  • tor / tor
  • tor / tor
  • tor / tor
  • tor / tor
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  • tor / tor
  • tor / tor
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  • 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
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  • 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 179 more…

References

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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