In OSSEC-HIDS 2.7 through 3.5.0, the server component responsible for log analysis (ossec-analysisd) is vulnerable to a heap-based buffer o…

published 2020-01-30 6y ago modified 2026-06-17 4mo ago also EUVD-2020-29308

cvss: 8.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.4%; EPSS 2.4% chance of exploitation in 30 days, percentile 84%
public exploits: 0; none known

In OSSEC-HIDS 2.7 through 3.5.0, the server component responsible for log analysis (ossec-analysisd) is vulnerable to a heap-based buffer overflow in the rootcheck decoder component via an authenticated client.

Patch / fix

links 1

github.com/ossec/ossec-hids/issues/1820 advisory

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Exploit prediction

2.39% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

github.com https://github.com/ossec/ossec-hids/issues/1820 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	6.5	AV:N/AC:L/Au:S/C:P/I:P/A:P

Classification

Weakness

CWE-787 Out-of-bounds Write

References

github.com /ossec/ossec-hids/issues/1820
exploit, patch, third-party-advisory
security.gentoo.org /glsa/202007-33
vendor-advisory, third-party-advisory
ossec.net /
vendor-advisory
github.com /ossec/ossec-hids/issues/1821
third-party-advisory

Sources

CVE List CVE-2020-8442
NVD CVE-2020-8442

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