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CVE-2018-16881

26
FAUCET Score

CVE-2018-16881 describes a denial-of-service vulnerability in rsyslog's imptcp module, affecting versions prior to 8.27.0, including those found in Debian and Red Hat. An unauthenticated attacker can crash the rsyslog service by sending a specially crafted message to the imptcp socket, resulting in a high-severity impact (CVSS 7.5). Despite its potential for disruption, there is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 8.27.0CPE matchmatch criteria
cpe:2.3:a:rsyslog:rsyslog:*:*:*:*:*:*:*:*
4.3CPE matchmatch criteria
cpe:2.3:a:redhat:virtualization_manager:4.3:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:7.0:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_for_power_big_endian:7.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.24%
Probability of exploitation in next 30 days
EPSS Percentile
81.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0224 is in the 66th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (9)

redhatpatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: rsyslog-0:8.24.0-38.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Virtualization 4 for Red Hat Enterprise Linux 7Fixed in: rsyslog-0:8.24.0-41.el7_7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Virtualization 4 for Red Hat Enterprise Linux 7Fixed in: imgbased-0:1.1.9-0.1.el7ev
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Virtualization 4 for Red Hat Enterprise Linux 7Fixed in: ovirt-node-ng-0:4.3.5-0.20190717.0.el7ev
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Virtualization 4 for Red Hat Enterprise Linux 7Fixed in: redhat-release-virtualization-host-0:4.3.5-2.el7ev
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Virtualization 4 for Red Hat Enterprise Linux 7Fixed in: redhat-virtualization-host-0:4.3.5-20190722.0.el7_7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Virtualization 4 for Red Hat Enterprise Linux 7Fixed in: rhvm-appliance-0:4.3-20190722.0.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Virtualization Engine 4.3Fixed in: rsyslog-0:8.24.0-41.el7_7
View patch

Vendor Advisories (1)

redhatCVE-2018-16881Moderate

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

Apr 19, 2017

References

access.redhat.com / errata/RHBA-2019:2501
Third Party Advisory
access.redhat.com / errata/RHSA-2019:2110
Third Party Advisory
access.redhat.com / errata/RHSA-2019:2437
Third Party Advisory
access.redhat.com / errata/RHSA-2019:2439
Third Party Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingMitigationPatchThird Party Advisory
lists.debian.org / debian-lts-announce/2022/05/msg00028.html
Mailing ListThird Party Advisory