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Vulnerability record · CVE-2011-2778 · published 23 December 2011

CVE-2011-2778: Tor memory buffer overflow vulnerability

Tor · Tor

Multiple heap-based buffer overflows in Tor before 0.2.2.35 allow remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code by (1) establishing a SOCKS connection to SocksPort or (2) leveraging a SOCKS proxy configuration.

7.6 CVSS 2.0 High EPSS 3.8% · top 10.5% CWE-119 · Memory buffer overflow
7.6CVSS 2.0 base score
3.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
16 Jun 2026Last modified by NVD

Description

Multiple heap-based buffer overflows in Tor before 0.2.2.35 allow remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code by (1) establishing a SOCKS connection to SocksPort or (2) leveraging a SOCKS proxy configuration.

AV:N/AC:H/Au:N/C:C/I:C/A:C

Affected products

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

References

LinkTags
http://www.debian.org/security/2011/dsa-2363
https://blog.torproject.org/blog/tor-02235-released-security-patches PatchVendor Advisory
http://www.debian.org/security/2011/dsa-2363
https://blog.torproject.org/blog/tor-02235-released-security-patches 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-2011-2778), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.