High severity7.5NVD Advisory· Published Mar 5, 2021· Updated Jun 17, 2026
CVE-2021-28040
CVE-2021-28040
Description
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.
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Affected products
2- OSSEC/OSSECdescription
Patches
Vulnerability mechanics
References
1- github.com/ossec/ossec-hids/issues/1953nvdExploitIssue TrackingThird Party Advisory
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