Is CVE-2013-6404 in the CISA KEV catalog?

No. CVE-2013-6404 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2013-6404?

CVE-2013-6404 has a CVSS v2 base score of 4.0 (MEDIUM).

What is the EPSS score for CVE-2013-6404?

CVE-2013-6404 has an EPSS score of 2.06% (79th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2013-6404?

Upgrade quassel on debian 11 to 0.9.2-1 or later.

CVE & CISA-KEV Catalog

CVE-2013-6404

MEDIUMEPSS 79th pctl

4.0

CVSS v2

NVD

Description

Quassel core (server daemon) in Quassel IRC before 0.9.2 does not properly verify the user ID when accessing user backlogs, which allows remote authenticated users to read other users' backlogs via the bufferid in (1) 16/select_buffer_by_id.sql, (2) 16/select_buffer_by_id.sql, and (3) 16/select_buffer_by_id.sql in core/SQL/PostgreSQL/.

CWE-264Permissions, Privileges, and Access Controls

How to fix

Remediation Available

quasselDebian

Fixed in:0.9.2-1CVE-2013-6404

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

2.06%probability of exploitation in 30 days

79thpercentile

Elevated risk: more likely to be exploited than 79% of all known CVEs.

References

Patch2

Vendor Advisory1

secunia.com

Other references5

Related Vulnerabilities

Other CWE-264 (Permissions, Privileges, and Access Controls) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2012-1456	Medium	4.3	100%	-	-
CVE-2012-1459	Medium	4.3	100%	-	Fix
CVE-2012-1446	Medium	4.3	100%	-	-
CVE-2012-1443	Medium	4.3	100%	-	-
CVE-2012-1442	Medium	4.3	99%	-	-
CVE-2012-1457	Medium	4.3	98%	-	Fix

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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 2026-04-29.