← Vulnerability feed

Vulnerability record · CVE-2011-1951 · published 11 July 2011

CVE-2011-1951: Oneidentity syslog-ng vulnerability

Oneidentity · Syslog Ng

lib/logmatcher.c in Balabit syslog-ng before 3.2.4, when the global flag is set and when using PCRE 8.12 and possibly other versions, allows remote attackers to cause a denial of service (memory consumption) via a message that does not match a regular expression.

4.3 CVSS 2.0 Medium EPSS 2.5% · top 16.2% CWE-399 · CWE-399
4.3CVSS 2.0 base score
2.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
12References
16 Jun 2026Last modified by NVD

Description

lib/logmatcher.c in Balabit syslog-ng before 3.2.4, when the global flag is set and when using PCRE 8.12 and possibly other versions, allows remote attackers to cause a denial of service (memory consumption) via a message that does not match a regular expression.

AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://git.balabit.hu/?p=bazsi/syslog-ng-3.2.git%3Ba=commit%3Bh=09710c0b105e579d35c7b5f6c66d1ea5e3a3d3ff
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/062107.html Mailing ListThird Party Advisory
http://secunia.com/advisories/45122 Third Party Advisory
http://www.openwall.com/lists/oss-security/2011/05/26/1 Mailing ListPatchThird Party Advisory
http://www.securityfocus.com/bid/47800 Third Party AdvisoryVDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=709088 Issue TrackingPatchThird Party Advisory
http://git.balabit.hu/?p=bazsi/syslog-ng-3.2.git%3Ba=commit%3Bh=09710c0b105e579d35c7b5f6c66d1ea5e3a3d3ff
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/062107.html Mailing ListThird Party Advisory
http://secunia.com/advisories/45122 Third Party Advisory
http://www.openwall.com/lists/oss-security/2011/05/26/1 Mailing ListPatchThird Party Advisory
http://www.securityfocus.com/bid/47800 Third Party AdvisoryVDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=709088 Issue TrackingPatchThird Party Advisory

Track CVE-2011-1951 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.3CVE-2008-5110Oneidentity syslog-ng vulnerabilitysyslog-ng does not call chdir when it calls chroot, which might allow attackers to escape the intended jail. NOTE: this is only a vulnerability when …EPSS 2.2%7.8CVE-2020-8019Oneidentity syslog-ng vulnerabilityA UNIX Symbolic Link (Symlink) Following vulnerability in the packaging of syslog-ng of SUSE Linux Enterprise Debuginfo 11-SP3, SUSE Linux Enterprise…EPSS 0.52%7.5CVE-2024-47619Oneidentity syslog-ng improper certificate validation vulnerabilitysyslog-ng is an enhanced log daemo. Prior to version 4.8.2, `tls_wildcard_match()` matches on certificates such as `foo.*.bar` although that is not a…EPSS 0.35%7.5CVE-2022-38725Oneidentity syslog-ng integer overflow vulnerabilityAn integer overflow in the RFC3164 parser in One Identity syslog-ng 3.0 through 3.37 allows remote attackers to cause a Denial of Service via crafted…EPSS 2.4%7.5CVE-2002-1200Oneidentity syslog-ng memory buffer overflow vulnerabilityBalabit Syslog-NG 1.4.x before 1.4.15, and 1.5.x before 1.5.20, when using template filenames or output, does not properly track the size of a buffer…EPSS 5.6%6.9CVE-2011-0343Oneidentity syslog-ng permissions and access controls vulnerabilityBalabit syslog-ng 2.0, 3.0, 3.1, 3.2 OSE and PE, when running on FreeBSD or HP-UX, does not properly perform cast operations, which causes syslog-ng …EPSS 0.38%8.8CVE-2010-0806Microsoft Internet Explorer Peer Objects use-after-free allows remote code executionInternet Explorer 6, 6 SP1 and 7 contain a use-after-free in the Peer Objects component (iepeers.dll), where an object is accessed after deletion, le…KEVEPSS 82%analysed5.9CVE-2018-0180Cisco IOS Login Block feature denial-of-service via crafted login attemptsMultiple flaws in the Login Enhancements (Login Block) feature of Cisco IOS Software let an unauthenticated remote attacker trigger a reload of the d…KEVEPSS 4.9%analysed

Source: NIST National Vulnerability Database (record CVE-2011-1951), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.