Is CVE-2006-6811 in the CISA KEV catalog?

No. CVE-2006-6811 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2006-6811?

CVE-2006-6811 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2006-6811?

CVE-2006-6811 has an EPSS score of 9.99% (95th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2006-6811?

No published fix for CVE-2006-6811 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2006-6811

MEDIUMEPSS 95th pctl

6.5

CVSS v3

NVD

Description

KsIRC 1.3.12 allows remote attackers to cause a denial of service (crash) via a long PRIVMSG string when connecting to an Internet Relay Chat (IRC) server, which causes an assertion failure and results in a NULL pointer dereference. NOTE: this issue was originally reported as a buffer overflow.

CWE-617

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

9.99%probability of exploitation in 30 days

95thpercentile

Very high risk: more likely to be exploited than 95% of all known CVEs.

References

Exploit2

Third-Party Advisory6

Other references5

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.