CVE-2011-0520

Severity: high (CVSS 7.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 5.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2011-01-28 · updated 2026-06-16
Weakness: CWE-119

Description

The compress_add_dlabel_points function in dns/Compress.c in MaraDNS 1.4.03, 1.4.05, and probably other versions allows remote attackers to cause a denial of service (segmentation fault) and possibly execute arbitrary code via a long DNS hostname with a large number of labels, which triggers a heap-based buffer overflow.

Affected products

MaraDNS: 1.4.03, 1.4.05

References

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=610834
http://osvdb.org/70630
http://secunia.com/advisories/43027
http://secunia.com/advisories/43107
http://www.debian.org/security/2011/dsa-2196
http://www.openwall.com/lists/oss-security/2011/01/24/1
http://www.openwall.com/lists/oss-security/2011/01/24/6
http://www.securityfocus.com/bid/45966
http://www.vupen.com/english/advisories/2011/0699
https://exchange.xforce.ibmcloud.com/vulnerabilities/64885
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=610834
http://osvdb.org/70630

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