CVE-2013-6404

Exp

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/.

Published: 2013-12-09 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2013-6404 is rated High Exploit Risk (60.2/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.06%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.61% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2013-6404

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2013-6404

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.45% 2.06% +1.61%
2 2025-03-30 0.84% 0.45% -0.40%
3 2025-03-29 — 0.84% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2013-6404

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.0 2.0 MEDIUM
AV:N/AC:L/Au:S/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.0 2.9 [email protected]

Weakness enumeration for CVE-2013-6404

OS Trackers for CVE-2013-6404

vendor priority summary link
debian low CVE-2013-6404 low priority: Debian including 1 source packages (quassel), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2013-6404
ubuntu low CVE-2013-6404 low priority: Ubuntu including 1 source packages (quassel), 6 status rows across 6 suites (lucid, precise, quantal, raring, saucy, upstream): released 4, ignored 2. https://ubuntu.com/security/CVE-2013-6404

Affected software / configurations for CVE-2013-6404

Vendor Product Version Raw CPE
quassel-irc quassel_irc <= 0.9.1 cpe:2.3:a:quassel-irc:quassel_irc:*:*:*:*:*:*:*:*
quassel-irc quassel_irc 0.9.0 cpe:2.3:a:quassel-irc:quassel_irc:0.9.0:*:*:*:*:*:*:*

References for CVE-2013-6404

cvelogic Threat Intelligence