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Vulnerability record · CVE-2011-0427 · published 19 January 2011

CVE-2011-0427: Tor memory buffer overflow vulnerability

Tor · Tor

Heap-based buffer overflow in Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha allows remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unspecified vectors.

6.8 CVSS 2.0 Medium EPSS 4.4% · top 8.9% CWE-119 · Memory buffer overflow
6.8CVSS 2.0 base score
4.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
22References
16 Jun 2026Last modified by NVD

Description

Heap-based buffer overflow in Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha allows remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unspecified vectors.

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

Affected products

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

References

LinkTags
http://archives.seul.org/or/announce/Jan-2011/msg00000.html Patch
http://blog.torproject.org/blog/tor-02129-released-security-patches PatchVendor Advisory
http://secunia.com/advisories/42905 Vendor Advisory
http://secunia.com/advisories/42907 Vendor Advisory
http://www.debian.org/security/2011/dsa-2148
http://www.securityfocus.com/bid/45832
http://www.securitytracker.com/id?1024980
http://www.vupen.com/english/advisories/2011/0131 Vendor Advisory
http://www.vupen.com/english/advisories/2011/0132 Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/64748
https://gitweb.torproject.org/tor.git/blob/refs/heads/release-0.2.2:/ChangeLog Patch
http://archives.seul.org/or/announce/Jan-2011/msg00000.html Patch
http://blog.torproject.org/blog/tor-02129-released-security-patches PatchVendor Advisory
http://secunia.com/advisories/42905 Vendor Advisory
http://secunia.com/advisories/42907 Vendor Advisory
http://www.debian.org/security/2011/dsa-2148
http://www.securityfocus.com/bid/45832
http://www.securitytracker.com/id?1024980
http://www.vupen.com/english/advisories/2011/0131 Vendor Advisory
http://www.vupen.com/english/advisories/2011/0132 Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/64748
https://gitweb.torproject.org/tor.git/blob/refs/heads/release-0.2.2:/ChangeLog Patch

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Related vulnerabilities

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

10.0CVE-2010-1676Tor memory buffer overflow vulnerabilityHeap-based buffer overflow in Tor before 0.2.1.28 and 0.2.2.x before 0.2.2.20-alpha allows remote attackers to cause a denial of service (daemon cras…EPSS 7.9%10.0CVE-2009-0939Tor vulnerabilityTor before 0.2.0.34 treats incomplete IPv4 addresses as valid, which has unknown impact and attack vectors related to "Spec conformance," as demonstr…EPSS 2.1%10.0CVE-2009-0414Tor vulnerabilityUnspecified vulnerability in Tor before 0.2.0.33 has unspecified impact and remote attack vectors that trigger heap corruption.EPSS 3.0%9.3CVE-2008-5398Tor permissions and access controls vulnerabilityTor before 0.2.0.32 does not properly process the ClientDNSRejectInternalAddresses configuration option in situations where an exit relay issues a po…EPSS 2.0%7.6CVE-2011-2778Tor memory buffer overflow vulnerabilityMultiple heap-based buffer overflows in Tor before 0.2.2.35 allow remote attackers to cause a denial of service (memory corruption) or possibly execu…EPSS 3.8%7.5CVE-2006-3409Tor vulnerabilityInteger overflow in Tor before 0.1.1.20 allows remote attackers to execute arbitrary code via crafted large inputs, which result in a buffer overflow…EPSS 3.7%7.2CVE-2008-5397Tor permissions and access controls vulnerabilityTor before 0.2.0.32 does not properly process the (1) User and (2) Group configuration options, which might allow local users to gain privileges by l…EPSS 0.36%6.4CVE-2007-4097Tor vulnerabilityTor before 0.1.2.15 sends "destroy cells" containing the reason for tearing down a circuit, which allows remote attackers to obtain sensitive informa…EPSS 2.2%

Source: NIST National Vulnerability Database (record CVE-2011-0427), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.