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Fencer Intel
medium 4.3

CVE-2011-4895 json

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 mak…

published 2011-12-23 14 y ago modified 2026-06-16 4 mo ago also EUVD-2011-4812

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 74%
public exploits
0
none known

Summary

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.

Patch / fix

  • tor Debian 14, Debian 13, Debian 12 0.2.2.34-1

debian advisories DEBIAN-CVE-2011-4895

  • tor openSUSE Tumbleweed 0.2.8.11-1.1

opensuse advisories openSUSE-SU-2024:10423-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2011-4895 updated cvss 5.0

Tor Bridge circuit building information disclosure

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.53% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.