What is CVE-2021-28040?

CVE-2021-28040 is a high-severity vulnerability in Ossec, classified under Uncontrolled Recursion. CVSS score: 7.5/10. Published 2021-03-05.

How severe is CVE-2021-28040?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2021-28040 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Ossec

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.

EPSS: 0.012 (64.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Ossec — versions 3.6.0
N/a — versions n/a

Weakness classification (CWE)

CWE-674 — Uncontrolled Recursion

Public proof-of-concept exploits

FUAZA/ECE9069_

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC, Issue Tracking)

Frequently asked questions

What is CVE-2021-28040?: CVE-2021-28040 is a high-severity vulnerability in Ossec, classified under Uncontrolled Recursion. CVSS score: 7.5/10. Published 2021-03-05.
How severe is CVE-2021-28040?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-28040 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.