CVE-2011-0520: Maradns

High severity, CVSS 7.5. EPSS: 5.2% chance of exploitation in the next 30 days.

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 Maradns: version 1.4.03 only; version 1.4.05 only

Published 2011-01-28. Last modified 2026-06-16.