CVE-2023-31209: Improper neutralization of active check command arguments in Checkmk < 2.1.0p32, < 2.0.0p38, < 2.2.0p4 leads t

Q: How do I fix CVE-2023-31209?

checkmk: downgrade or apply the listed mitigation; checkmk: upgrade to 2.0.0. Exact commands for each OS are on this page.

Q: Is CVE-2023-31209 being exploited?

CVE-2023-31209 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-31209 affect?

CVE-2023-31209 affects checkmk, checkmk. Severity is high (CVSS 8.8). Improper neutralization of active check command arguments in Checkmk < 2.1.0p32, < 2.0.0p38, < 2.2.0p4 leads to arbitrary command execution for authenticated users.

This month

HIGH 8.8DOWNGRADEUPGRADE

CVE-2023-31209 is a high-severity flaw (CVSS 8.8) affecting checkmk, checkmk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper neutralization of active check command arguments in Checkmk < 2.1.0p32, < 2.0.0p38, < 2.2.0p4 leads to arbitrary command execution for authenticated users.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-78, CWE-74
Published	2023-08-10
Last modified	2026-10-24

Publisher (CNA): Checkmk GmbH · Vendor: checkmk · tribe29

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-08-10 09:15 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

checkmk checkmk DOWNGRADE

Affected: 2.0.0 · 2.0.0 b1 · 2.0.0 b2 · 2.0.0 b3 · 2.0.0 b4 · 2.0.0 b5 · 2.0.0 b6 · 2.0.0 b7

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy checkmk || rpm -q checkmk || checkmk --version

2. No fixed release: DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison checkmk sudo apt install checkmk=<VERSION_BEFORE_2.0.0> sudo apt-mark hold checkmk

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list checkmk sudo dnf downgrade checkmk-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add checkmk

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

tribe29 checkmk UPGRADE

Affected: < 2.0.0

Fixed in: 2.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy checkmk || rpm -q checkmk || checkmk --version

2. UPGRADE to 2.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade checkmk

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade checkmk

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · gnome-shell-extension-tiling-assistant · FIXED · 56-1.fc46 · FEDORA-2026-ebf66a5321 · source

sudo dnf upgrade --advisory=FEDORA-2026-ebf66a5321

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-31209?

checkmk: downgrade or apply the listed mitigation; checkmk: upgrade to 2.0.0. Exact commands for each OS are on this page.

Is CVE-2023-31209 being exploited?

CVE-2023-31209 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-31209 affect?

CVE-2023-31209 affects checkmk, checkmk. Severity is high (CVSS 8.8). Improper neutralization of active check command arguments in Checkmk < 2.1.0p32, < 2.0.0p38, < 2.2.0p4 leads to arbitrary command execution for authenticated users.

How urgent is CVE-2023-31209?

Priority 47/100. High severity

Related CVEs

CVE-2023-31208 HIGH 8.3 DOWNGRADE UPGRADE Improper neutralization of livestatus command delimiters in the RestAPI in Checkmk < 2.0.0p36, < 2.1.0p28, and
CVE-2026-33456 HIGH 7.6 DOWNGRADE Livestatus injection in the notification test mode in Checkmk <2.5.0b4 and <2.4.0p26 allows an authenticated u
CVE-2024-47091 HIGH 7.8 DOWNGRADE Privilege escalation in the mk_mysql agent plugin on Windows in Checkmk <2.4.0p29, <2.3.0p47, and 2.2.0 (EOL)
CVE-2023-22348 MEDIUM 4.3 DOWNGRADE UPGRADE Improper Authorization in RestAPI in Checkmk GmbH's Checkmk versions <2.1.0p28 and <2.2.0b8 allows remote auth
CVE-2023-23548 MEDIUM 5.4 UPGRADE Reflected XSS in business intelligence in Checkmk <2.2.0p8, <2.1.0p32, <2.0.0p38, <=1.6.0p30.

References

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