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Fencer Vulns
medium 5.3

CVE-2018-16881 json

A denial of service vulnerability was found in rsyslog in the imptcp module.

published 2019-01-25 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-8671

cvss
5.3
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.2%
EPSS 2.2% chance of exploitation in 30 days, percentile 82%
public exploits
0
none known

Summary

A denial of service vulnerability was found in rsyslog in the imptcp module. An attacker could send a specially crafted message to the imptcp socket, which would cause rsyslog to crash. Versions before 8.27.0 are vulnerable.

Patch / fix

  • rsyslog rsyslog 8.27.0
  • rsyslog Debian 14, Debian 13, Debian 12 8.27.0-2

debian advisories DEBIAN-CVE-2018-16881

  • rsyslog Ubuntu Pro 16.04 LTS 8.16.0-1ubuntu3.1+esm1

ubuntu advisories UBUNTU-CVE-2018-16881

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • rhvm-appliance RHEL 7 2:4.3-20190722.0.el7
  • imgbased RHEL 7 1.1.9-0.1.el7ev
  • ovirt-node-ng RHEL 7 4.3.5-0.20190717.0.el7ev
  • python-imgbased RHEL 7 1.1.9-0.1.el7ev
  • ovirt-node-ng-nodectl RHEL 7 4.3.5-0.20190717.0.el7ev
  • redhat-virtualization-host RHEL 7 4.3.5-20190722.0.el7_7
  • python2-ovirt-node-ng-nodectl RHEL 7 4.3.5-0.20190717.0.el7ev
  • redhat-release-virtualization-host RHEL 7 4.3.5-2.el7ev

red hat advisories RHSA-2019:2439RHSA-2019:2437RHSA-2019:2110RHBA-2019:2501

  • rsyslog SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES 12 SP4 +3 more 8.24.0-3.19.1

suse advisories SUSE-SU-2019:0209-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-16881 updated cvss 5.3

rsyslog: imptcp: integer overflow when Octet-Counted TCP Framing is enabled

  • Red Hat Enterprise Linux Client (v. 7) rsyslog 8.24.0-38.el7, rsyslog-relp 8.24.0-38.el7, rsyslog-kafka 8.24.0-38.el7, rsyslog-gnutls 8.24.0-38.el7, rsyslog-gssapi 8.24.0-38.el7, rsyslog-mmjsonparse 8.24.0-38.el7 Red Hat Enterprise Linux Client Optional (v. 7) rsyslog-snmp 8.24.0-38.el7, rsyslog-mysql 8.24.0-38.el7, rsyslog-pgsql 8.24.0-38.el7, rsyslog-crypto 8.24.0-38.el7, rsyslog-libdbi 8.24.0-38.el7, rsyslog-mmaudit 8.24.0-38.el7, +5 more Red Hat Enterprise Linux ComputeNode (v. 7) rsyslog 8.24.0-38.el7, rsyslog-relp 8.24.0-38.el7, rsyslog-kafka 8.24.0-38.el7, rsyslog-gnutls 8.24.0-38.el7, rsyslog-gssapi 8.24.0-38.el7, rsyslog-mmjsonparse 8.24.0-38.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) rsyslog-snmp 8.24.0-38.el7, rsyslog-mysql 8.24.0-38.el7, rsyslog-pgsql 8.24.0-38.el7, rsyslog-crypto 8.24.0-38.el7, rsyslog-libdbi 8.24.0-38.el7, rsyslog-mmaudit 8.24.0-38.el7, +5 more Red Hat Enterprise Linux Server (v. 7) rsyslog 8.24.0-38.el7, rsyslog-relp 8.24.0-38.el7, rsyslog-kafka 8.24.0-38.el7, rsyslog-mysql 8.24.0-38.el7, rsyslog-pgsql 8.24.0-38.el7, rsyslog-gnutls 8.24.0-38.el7, +2 more Red Hat Enterprise Linux Server Optional (v. 7) rsyslog-snmp 8.24.0-38.el7, rsyslog-crypto 8.24.0-38.el7, rsyslog-libdbi 8.24.0-38.el7, rsyslog-mmaudit 8.24.0-38.el7, rsyslog-udpspoof 8.24.0-38.el7, rsyslog-mmjsonparse 8.24.0-38.el7, +4 more
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 7) rsyslog 8.24.0-38.el7, rsyslog-relp 8.24.0-38.el7, rsyslog-kafka 8.24.0-38.el7, rsyslog-mysql 8.24.0-38.el7, rsyslog-pgsql 8.24.0-38.el7, rsyslog-gnutls 8.24.0-38.el7, +2 more Red Hat Enterprise Linux Workstation Optional (v. 7) rsyslog-snmp 8.24.0-38.el7, rsyslog-crypto 8.24.0-38.el7, rsyslog-libdbi 8.24.0-38.el7, rsyslog-mmaudit 8.24.0-38.el7, rsyslog-udpspoof 8.24.0-38.el7, rsyslog-mmnormalize 8.24.0-38.el7, +3 more
    fixed: vendor fix RHSA-2019:2110
  • Red Hat Virtualization 4 Hypervisor for RHEL 7 rhvm-appliance 4.3-20190722.0.el7, redhat-virtualization-host 4.3.5-20190722.0.el7_7, redhat-virtualization-host-image-update 4.3.5-20190722.0.el7_7 Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts rsyslog 8.24.0-41.el7_7, rhvm-appliance 4.3-20190722.0.el7, rsyslog-mmjsonparse 8.24.0-41.el7_7, rsyslog-mmnormalize 8.24.0-41.el7_7, rsyslog-elasticsearch 8.24.0-41.el7_7
    fixed: vendor fix RHSA-2019:2439
  • Red Hat RHEL 7-based RHEV-H for RHEV 4 (build requirements) imgbased 1.1.9-0.1.el7ev, python-imgbased 1.1.9-0.1.el7ev, ovirt-node-ng 4.3.5-0.20190717.0.el7ev, ovirt-node-ng-nodectl 4.3.5-0.20190717.0.el7ev, redhat-release-virtualization-host 4.3.5-2.el7ev, python2-ovirt-node-ng-nodectl 4.3.5-0.20190717.0.el7ev, +1 more
    fixed: vendor fix RHSA-2019:2437
  • Red Hat RHV-M 4.3 rsyslog 8.24.0-41.el7_7, rsyslog-mmnormalize 8.24.0-41.el7_7, rsyslog-elasticsearch 8.24.0-41.el7_7
    fixed: vendor fix RHBA-2019:2501
  • Red Hat Enterprise Linux 5 rsyslog, rsyslog5 Red Hat Enterprise Linux 6 rsyslog, rsyslog7, rsyslog-relp, rsyslog-snmp, rsyslog-mysql, rsyslog-pgsql, +9 more Red Hat Enterprise Linux 8 rsyslog, rsyslog-relp, rsyslog-snmp, rsyslog-kafka, rsyslog-mysql, rsyslog-pgsql, +13 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.24% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 5.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • The rsyslog Project rsyslog:

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.