CVE-2012-5573

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2013-01-01 · updated 2026-06-16
Weakness: CWE-399

Description

The connection_edge_process_relay_cell function in or/relay.c in Tor before 0.2.3.25 maintains circuits even if an unexpected SENDME cell arrives, which might allow remote attackers to cause a denial of service (memory consumption or excessive cell reception rate) or bypass intended flow-control restrictions via a RELAY_COMMAND_SENDME command.

Affected products

torproject Tor: through 0.2.3.24; 0.0.2, 0.0.2-pre13, 0.0.2-pre14, 0.0.2-pre15, 0.0.2-pre16, 0.0.2-pre17 (+92)

References

http://openwall.com/lists/oss-security/2012/11/26/11
http://secunia.com/advisories/51329
http://security.gentoo.org/glsa/glsa-201301-03.xml
https://bugs.gentoo.org/show_bug.cgi?id=444804
https://bugzilla.redhat.com/show_bug.cgi?id=880310
https://exchange.xforce.ibmcloud.com/vulnerabilities/80289
https://gitweb.torproject.org/arma/tor.git/commitdiff/b9b54568c0bb64c32bd0b362954bdbc8c1234b16
https://gitweb.torproject.org/tor.git/blob/release-0.2.3:/ReleaseNotes
https://trac.torproject.org/projects/tor/ticket/6252
http://openwall.com/lists/oss-security/2012/11/26/11
http://secunia.com/advisories/51329
http://security.gentoo.org/glsa/glsa-201301-03.xml

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