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Vulnerability record · CVE-2011-4897 · published 23 December 2011

CVE-2011-4897: Tor information exposure vulnerability

Tor · Tor

Tor before 0.2.2.25-alpha, when configured as a relay without the Nickname configuration option, uses the local hostname as the Nickname value, which allows remote attackers to obtain potentially sensitive information by reading this value.

4.3 CVSS 2.0 Medium EPSS 1.5% · top 26.3% CWE-200 · Information exposure
4.3CVSS 2.0 base score
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
16 Jun 2026Last modified by NVD

Description

Tor before 0.2.2.25-alpha, when configured as a relay without the Nickname configuration option, uses the local hostname as the Nickname value, which allows remote attackers to obtain potentially sensitive information by reading this value.

AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://blog.torproject.org/blog/tor-02225-alpha-out PatchVendor Advisory
https://blog.torproject.org/blog/tor-02225-alpha-out PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2011-4897), CISA KEV, FIRST EPSS (scores of 2026-09-30). This page is refreshed as NVD updates the record.