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Vulnerability record · CVE-2018-1000140 · published 23 March 2018

CVE-2018-1000140: Rsyslog librelp out-of-bounds write vulnerability

Rsyslog · Librelp

rsyslog librelp version 1.2.14 and earlier contains a Buffer Overflow vulnerability in the checking of x509 certificates from a peer that can result in Remote code execution. This attack appear to be exploitable a remote attacker that can connect to rsyslog and trigger a stack buffer overflow by sending a specially crafted x509 certificate.

9.8 CVSS 3.0 Critical EPSS 9.3% · top 4.8% CWE-787 · Out-of-bounds write
9.8CVSS 3.0 base score, v2 7.5
9.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
26References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

rsyslog librelp version 1.2.14 and earlier contains a Buffer Overflow vulnerability in the checking of x509 certificates from a peer that can result in Remote code execution. This attack appear to be exploitable a remote attacker that can connect to rsyslog and trigger a stack buffer overflow by sending a specially crafted x509 certificate.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

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

References

LinkTags
http://packetstormsecurity.com/files/172829/librelp-Remote-Code-Execution.html
https://access.redhat.com/errata/RHSA-2018:1223 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1225 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1701 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1702 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1703 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1704 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1707 Third Party Advisory
https://github.com/rsyslog/librelp/blob/532aa362f0f7a8d037505b0a27a1df452f9bac9e/src/tcp.c#L1205 PatchThird Party Advisory
https://lgtm.com/rules/1505913226124/ ExploitThird Party Advisory
https://security.gentoo.org/glsa/201804-21 Third Party Advisory
https://usn.ubuntu.com/3612-1/ Third Party Advisory
https://www.debian.org/security/2018/dsa-4151 Third Party Advisory
http://packetstormsecurity.com/files/172829/librelp-Remote-Code-Execution.html
https://access.redhat.com/errata/RHSA-2018:1223 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1225 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1701 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1702 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1703 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1704 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:1707 Third Party Advisory
https://github.com/rsyslog/librelp/blob/532aa362f0f7a8d037505b0a27a1df452f9bac9e/src/tcp.c#L1205 PatchThird Party Advisory
https://lgtm.com/rules/1505913226124/ ExploitThird Party Advisory
https://security.gentoo.org/glsa/201804-21 Third Party Advisory
https://usn.ubuntu.com/3612-1/ Third Party Advisory
https://www.debian.org/security/2018/dsa-4151 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-1000140), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.