HOMEVULNERABILITIESCVE-2020-8443
CRITICAL

CVE-2020-8443

CWE-193Published: January 30, 2020· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official 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).

NVD Source

Technical Analysis

CVE-2020-8443 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

ossec1 product(s)
ossec
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://github.com/ossec/ossec-hids/issues/1816
ADVISORYhttps://github.com/ossec/ossec-hids/issues/1821
ADVISORYhttps://security.gentoo.org/glsa/202007-33
ADVISORYhttps://www.ossec.net/
ADVISORYhttps://github.com/ossec/ossec-hids/issues/1816
ADVISORYhttps://github.com/ossec/ossec-hids/issues/1821
ADVISORYhttps://security.gentoo.org/glsa/202007-33
ADVISORYhttps://www.ossec.net/

All References (8)

→
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

Quick Facts

CVE IDCVE-2020-8443
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-193
CISA KEVNo
Affected1 vendor(s)
PublishedJan 30, 2020

Related CVEs (CWE-193)

CVE-2024-10442
10.0
CVE-2025-54349
10.0
CVE-2016-10160
9.8
CVE-2024-38441
9.8
CVE-2025-43973
9.8
CVE-2018-14599
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-8443 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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