CVE-2021-28040

An issue was discovered in OSSEC 3.6.0. An uncontrolled recursion vulnerability in os_xml.c occurs when a large number of opening and closing XML tags is used. Because recursion is used in _ReadElem without restriction, an attacker can trigger a segmentation fault once unmapped memory is reached.

• CWE-674

• https://github.com/ossec/ossec-hids/issues/1953Exploit, Issue Tracking, Third Party Advisory
• https://github.com/ossec/ossec-hids/issues/1953Exploit, Issue Tracking, Third Party Advisory

Published

Mar 5, 2021

Last Modified

Jun 17, 2026

Status

Modified

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