CVE-2020-8443

Name: CVE-2020-8443
Creator: NVD / NIST
Published: 2020-01-30T01:15:10.777+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.69%

Last modified Jun 17, 2026

CVE-2020-8443 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. In OSSEC-HIDS 2.7 through 3.5.0, the server component responsible for log analysis (ossec-analysisd) is vulnerable to an off-by-one heap-based buffer overflow during the cleaning of crafted syslog msgs (received from authenticated remote agents and delivered to the analysisd processing queue by ossec-remoted).. EPSS estimates a 2.69% chance of exploitation in the next 30 days.

Description

In OSSEC-HIDS 2.7 through 3.5.0, the server component responsible for log analysis (ossec-analysisd) is vulnerable to an off-by-one heap-based buffer overflow during the cleaning of crafted syslog msgs (received from authenticated remote agents and delivered to the analysisd processing queue by ossec-remoted).

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.69%

83.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Ossec	Ossec	>= 2.7, <= 3.5.0

References

https://github.com/ossec/ossec-hids/issues/1816Exploit, Third Party Advisory
https://github.com/ossec/ossec-hids/issues/1821Third Party Advisory
https://security.gentoo.org/glsa/202007-33Third Party Advisory
https://www.ossec.net/Vendor Advisory
https://github.com/ossec/ossec-hids/issues/1816Exploit, Third Party Advisory
https://github.com/ossec/ossec-hids/issues/1821Third Party Advisory
https://security.gentoo.org/glsa/202007-33Third Party Advisory
https://www.ossec.net/Vendor Advisory

Timeline

Published: Jan 30, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-8443?

How severe is CVE-2020-8443?

CVE-2020-8443 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.69% probability of exploitation in the next 30 days.

How do I fix CVE-2020-8443?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-8443?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST