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Vulnerability record · CVE-2012-3519 · published 26 August 2012

CVE-2012-3519: Tor information exposure vulnerability

Tor · Tor

routerlist.c in Tor before 0.2.2.38 uses a different amount of time for relay-list iteration depending on which relay is chosen, which might allow remote attackers to obtain sensitive information about relay selection via a timing side-channel attack.

5.0 CVSS 2.0 Medium EPSS 2.4% · top 16.4% CWE-200 · Information exposure
5.0CVSS 2.0 base score
2.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
16References
16 Jun 2026Last modified by NVD

Description

routerlist.c in Tor before 0.2.2.38 uses a different amount of time for relay-list iteration depending on which relay is chosen, which might allow remote attackers to obtain sensitive information about relay selection via a timing side-channel attack.

AV:N/AC:L/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
http://lists.opensuse.org/opensuse-updates/2012-08/msg00048.html
http://openwall.com/lists/oss-security/2012/08/21/6
http://secunia.com/advisories/50583
http://security.gentoo.org/glsa/glsa-201301-03.xml
https://gitweb.torproject.org/tor.git/commit/308f6dad20675c42b29862f4269ad1fbfb00dc9a
https://gitweb.torproject.org/tor.git/commit/d48cebc5e498b0ae673635f40fc57cdddab45d5b
https://lists.torproject.org/pipermail/tor-announce/2012-August/000086.html
https://trac.torproject.org/projects/tor/ticket/6537
http://lists.opensuse.org/opensuse-updates/2012-08/msg00048.html
http://openwall.com/lists/oss-security/2012/08/21/6
http://secunia.com/advisories/50583
http://security.gentoo.org/glsa/glsa-201301-03.xml
https://gitweb.torproject.org/tor.git/commit/308f6dad20675c42b29862f4269ad1fbfb00dc9a
https://gitweb.torproject.org/tor.git/commit/d48cebc5e498b0ae673635f40fc57cdddab45d5b
https://lists.torproject.org/pipermail/tor-announce/2012-August/000086.html
https://trac.torproject.org/projects/tor/ticket/6537

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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-2012-3519), CISA KEV, FIRST EPSS (scores of 2026-09-30). This page is refreshed as NVD updates the record.