CVE-2011-4623

Integer overflow in the rsCStrExtendBuf function in runtime/stringbuf.c in the imfile module in rsyslog 4.x before 4.6.6, 5.x before 5.7.4, and 6.x before 6.1.4 allows local users to cause a denial of service (daemon hang) via a large file, which triggers a heap-based buffer overflow.

Published: 2012-09-25 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-4623 is rated Low Risk (20.4/100): CVSS Low severity, with low exploitation likelihood (EPSS 0.42%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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

Exploit prediction scoring system (EPSS) score for CVE-2011-4623

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 0.09% 0.42% +0.33%
2 2025-03-17 0.04% 0.09% +0.05%
3 2023-03-07 — 0.04% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-4623

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
2.1 2.0 LOW
AV:L/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 3.9 2.9 [email protected]

Weakness enumeration for CVE-2011-4623

OS Trackers for CVE-2011-4623

vendor priority summary link
debian not yet assigned CVE-2011-4623 not yet assigned priority: Debian including 1 source packages (rsyslog), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2011-4623
gentoo normal CVE-2011-4623: 1 GLSA(s) (201412-35), 1 atom(s) (app-admin/rsyslog); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2011-4623
redhat medium — https://access.redhat.com/security/cve/CVE-2011-4623
ubuntu medium CVE-2011-4623 medium priority: Ubuntu including 1 source packages (rsyslog), 6 status rows across 6 suites (hardy, lucid, maverick, natty, oneiric, upstream): not-affected 4, released 2. https://ubuntu.com/security/CVE-2011-4623

Affected software / configurations for CVE-2011-4623

Vendor Product Version Raw CPE
rsyslog rsyslog 4.1.0 cpe:2.3:a:rsyslog:rsyslog:4.1.0:*:*:*:*:*:*:*
rsyslog rsyslog 4.1.1 cpe:2.3:a:rsyslog:rsyslog:4.1.1:*:*:*:*:*:*:*
rsyslog rsyslog 4.1.2 cpe:2.3:a:rsyslog:rsyslog:4.1.2:*:*:*:*:*:*:*
rsyslog rsyslog 4.1.3 cpe:2.3:a:rsyslog:rsyslog:4.1.3:*:*:*:*:*:*:*
rsyslog rsyslog 4.1.4 cpe:2.3:a:rsyslog:rsyslog:4.1.4:*:*:*:*:*:*:*
rsyslog rsyslog 4.1.5 cpe:2.3:a:rsyslog:rsyslog:4.1.5:*:*:*:*:*:*:*
rsyslog rsyslog 4.1.6 cpe:2.3:a:rsyslog:rsyslog:4.1.6:*:*:*:*:*:*:*
rsyslog rsyslog 4.1.7 cpe:2.3:a:rsyslog:rsyslog:4.1.7:*:*:*:*:*:*:*
rsyslog rsyslog 4.2.0 cpe:2.3:a:rsyslog:rsyslog:4.2.0:*:*:*:*:*:*:*
rsyslog rsyslog 4.3.0 cpe:2.3:a:rsyslog:rsyslog:4.3.0:*:*:*:*:*:*:*
rsyslog rsyslog 4.3.1 cpe:2.3:a:rsyslog:rsyslog:4.3.1:*:*:*:*:*:*:*
rsyslog rsyslog 4.3.2 cpe:2.3:a:rsyslog:rsyslog:4.3.2:*:*:*:*:*:*:*
rsyslog rsyslog 4.4.0 cpe:2.3:a:rsyslog:rsyslog:4.4.0:*:*:*:*:*:*:*
rsyslog rsyslog 4.4.1 cpe:2.3:a:rsyslog:rsyslog:4.4.1:*:*:*:*:*:*:*
rsyslog rsyslog 4.4.2 cpe:2.3:a:rsyslog:rsyslog:4.4.2:*:*:*:*:*:*:*
rsyslog rsyslog 4.5.0 cpe:2.3:a:rsyslog:rsyslog:4.5.0:*:*:*:*:*:*:*
rsyslog rsyslog 4.5.1 cpe:2.3:a:rsyslog:rsyslog:4.5.1:*:*:*:*:*:*:*
rsyslog rsyslog 4.5.2 cpe:2.3:a:rsyslog:rsyslog:4.5.2:*:*:*:*:*:*:*
rsyslog rsyslog 4.5.3 cpe:2.3:a:rsyslog:rsyslog:4.5.3:*:*:*:*:*:*:*
rsyslog rsyslog 4.5.4 cpe:2.3:a:rsyslog:rsyslog:4.5.4:*:*:*:*:*:*:*
rsyslog rsyslog 4.5.5 cpe:2.3:a:rsyslog:rsyslog:4.5.5:*:*:*:*:*:*:*
rsyslog rsyslog 4.5.6 cpe:2.3:a:rsyslog:rsyslog:4.5.6:*:*:*:*:*:*:*
rsyslog rsyslog 4.5.7 cpe:2.3:a:rsyslog:rsyslog:4.5.7:*:*:*:*:*:*:*
rsyslog rsyslog 4.5.8 cpe:2.3:a:rsyslog:rsyslog:4.5.8:*:*:*:*:*:*:*
rsyslog rsyslog 4.6.0 cpe:2.3:a:rsyslog:rsyslog:4.6.0:*:*:*:*:*:*:*
rsyslog rsyslog 4.6.1 cpe:2.3:a:rsyslog:rsyslog:4.6.1:*:*:*:*:*:*:*
rsyslog rsyslog 4.6.2 cpe:2.3:a:rsyslog:rsyslog:4.6.2:*:*:*:*:*:*:*
rsyslog rsyslog 4.6.3 cpe:2.3:a:rsyslog:rsyslog:4.6.3:*:*:*:*:*:*:*
rsyslog rsyslog 4.6.4 cpe:2.3:a:rsyslog:rsyslog:4.6.4:*:*:*:*:*:*:*
rsyslog rsyslog 4.6.5 cpe:2.3:a:rsyslog:rsyslog:4.6.5:*:*:*:*:*:*:*
rsyslog rsyslog 5.1.0 cpe:2.3:a:rsyslog:rsyslog:5.1.0:*:*:*:*:*:*:*
rsyslog rsyslog 5.1.1 cpe:2.3:a:rsyslog:rsyslog:5.1.1:*:*:*:*:*:*:*
rsyslog rsyslog 5.1.2 cpe:2.3:a:rsyslog:rsyslog:5.1.2:*:*:*:*:*:*:*
rsyslog rsyslog 5.1.3 cpe:2.3:a:rsyslog:rsyslog:5.1.3:*:*:*:*:*:*:*
rsyslog rsyslog 5.1.4 cpe:2.3:a:rsyslog:rsyslog:5.1.4:*:*:*:*:*:*:*
rsyslog rsyslog 5.1.5 cpe:2.3:a:rsyslog:rsyslog:5.1.5:*:*:*:*:*:*:*
rsyslog rsyslog 5.1.6 cpe:2.3:a:rsyslog:rsyslog:5.1.6:*:*:*:*:*:*:*
rsyslog rsyslog 5.2.0 cpe:2.3:a:rsyslog:rsyslog:5.2.0:*:*:*:*:*:*:*
rsyslog rsyslog 5.2.1 cpe:2.3:a:rsyslog:rsyslog:5.2.1:*:*:*:*:*:*:*
rsyslog rsyslog 5.2.2 cpe:2.3:a:rsyslog:rsyslog:5.2.2:*:*:*:*:*:*:*
rsyslog rsyslog 5.3.1 cpe:2.3:a:rsyslog:rsyslog:5.3.1:*:*:*:*:*:*:*
rsyslog rsyslog 5.3.2 cpe:2.3:a:rsyslog:rsyslog:5.3.2:*:*:*:*:*:*:*
rsyslog rsyslog 5.3.3 cpe:2.3:a:rsyslog:rsyslog:5.3.3:*:*:*:*:*:*:*
rsyslog rsyslog 5.3.4 cpe:2.3:a:rsyslog:rsyslog:5.3.4:*:*:*:*:*:*:*
rsyslog rsyslog 5.3.5 cpe:2.3:a:rsyslog:rsyslog:5.3.5:*:*:*:*:*:*:*
rsyslog rsyslog 5.3.6 cpe:2.3:a:rsyslog:rsyslog:5.3.6:*:*:*:*:*:*:*
rsyslog rsyslog 5.3.7 cpe:2.3:a:rsyslog:rsyslog:5.3.7:*:*:*:*:*:*:*
rsyslog rsyslog 5.4.0 cpe:2.3:a:rsyslog:rsyslog:5.4.0:*:*:*:*:*:*:*
rsyslog rsyslog 5.4.1 cpe:2.3:a:rsyslog:rsyslog:5.4.1:*:*:*:*:*:*:*
rsyslog rsyslog 5.4.2 cpe:2.3:a:rsyslog:rsyslog:5.4.2:*:*:*:*:*:*:*
rsyslog rsyslog 5.5.0 cpe:2.3:a:rsyslog:rsyslog:5.5.0:*:*:*:*:*:*:*
rsyslog rsyslog 5.5.1 cpe:2.3:a:rsyslog:rsyslog:5.5.1:*:*:*:*:*:*:*
rsyslog rsyslog 5.5.2 cpe:2.3:a:rsyslog:rsyslog:5.5.2:*:*:*:*:*:*:*
rsyslog rsyslog 5.5.3 cpe:2.3:a:rsyslog:rsyslog:5.5.3:*:*:*:*:*:*:*
rsyslog rsyslog 5.5.4 cpe:2.3:a:rsyslog:rsyslog:5.5.4:*:*:*:*:*:*:*
rsyslog rsyslog 5.5.5 cpe:2.3:a:rsyslog:rsyslog:5.5.5:*:*:*:*:*:*:*
rsyslog rsyslog 5.5.6 cpe:2.3:a:rsyslog:rsyslog:5.5.6:*:*:*:*:*:*:*
rsyslog rsyslog 5.5.7 cpe:2.3:a:rsyslog:rsyslog:5.5.7:*:*:*:*:*:*:*
rsyslog rsyslog 5.6.0 cpe:2.3:a:rsyslog:rsyslog:5.6.0:*:*:*:*:*:*:*
rsyslog rsyslog 5.6.1 cpe:2.3:a:rsyslog:rsyslog:5.6.1:*:*:*:*:*:*:*
rsyslog rsyslog 5.6.2 cpe:2.3:a:rsyslog:rsyslog:5.6.2:*:*:*:*:*:*:*
rsyslog rsyslog 5.6.3 cpe:2.3:a:rsyslog:rsyslog:5.6.3:*:*:*:*:*:*:*
rsyslog rsyslog 5.6.4 cpe:2.3:a:rsyslog:rsyslog:5.6.4:*:*:*:*:*:*:*
rsyslog rsyslog 5.6.5 cpe:2.3:a:rsyslog:rsyslog:5.6.5:*:*:*:*:*:*:*
rsyslog rsyslog 5.7.0 cpe:2.3:a:rsyslog:rsyslog:5.7.0:*:*:*:*:*:*:*
rsyslog rsyslog 5.7.1 cpe:2.3:a:rsyslog:rsyslog:5.7.1:*:*:*:*:*:*:*
rsyslog rsyslog 5.7.2 cpe:2.3:a:rsyslog:rsyslog:5.7.2:*:*:*:*:*:*:*
rsyslog rsyslog 5.7.3 cpe:2.3:a:rsyslog:rsyslog:5.7.3:*:*:*:*:*:*:*
rsyslog rsyslog 6.1.0 cpe:2.3:a:rsyslog:rsyslog:6.1.0:*:*:*:*:*:*:*
rsyslog rsyslog 6.1.1 cpe:2.3:a:rsyslog:rsyslog:6.1.1:*:*:*:*:*:*:*
rsyslog rsyslog 6.1.2 cpe:2.3:a:rsyslog:rsyslog:6.1.2:*:*:*:*:*:*:*
rsyslog rsyslog 6.1.3 cpe:2.3:a:rsyslog:rsyslog:6.1.3:*:*:*:*:*:*:*

References for CVE-2011-4623

cvelogic Threat Intelligence