High severity · published Mar 5, 2021
CVE-2021-28040
An issue was discovered in OSSEC 3.6.0
7.5
CVSS
1.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.2% · higher than 68% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OS
Ossec · Ossec
3.6.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-28040
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-28040
Exploit
https://github.com/ossec/ossec-hids/issues/1953
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