CVE-2011-0015

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: 2011-01-19 · updated 2026-06-16
Weakness: CWE-20

Description

Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha does not properly check the amount of compression in zlib-compressed data, which allows remote attackers to cause a denial of service via a large compression factor.

Affected products

Tor: through 0.2.1.28; 0.0.2, 0.0.2_pre13, 0.0.2_pre14, 0.0.2_pre15, 0.0.2_pre16, 0.0.2_pre17 (+200)

References

http://archives.seul.org/or/announce/Jan-2011/msg00000.html
http://blog.torproject.org/blog/tor-02129-released-security-patches
http://secunia.com/advisories/42905
http://secunia.com/advisories/42907
http://www.debian.org/security/2011/dsa-2148
http://www.openwall.com/lists/oss-security/2011/01/18/7
http://www.securityfocus.com/bid/45832
http://www.securitytracker.com/id?1024980
http://www.vupen.com/english/advisories/2011/0131
http://www.vupen.com/english/advisories/2011/0132
https://gitweb.torproject.org/tor.git/blob/refs/heads/release-0.2.2:/ChangeLog
https://trac.torproject.org/projects/tor/ticket/2324

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