CVE-2024-21623: OTCLient is an alternative tibia client for otserv

Q: How do I fix CVE-2024-21623?

otclient: upgrade to 2023-12-30. Exact commands for each OS are on this page.

Q: Is CVE-2024-21623 being exploited?

CVE-2024-21623 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-2024-21623 affect?

CVE-2024-21623 affects otclient. Severity is critical (CVSS 9.8). OTCLient is an alternative tibia client for otserv. Prior to commit db560de0b56476c87a2f967466407939196dd254, the /mehah/otclient "`Analysis - SonarCloud`" workflow is vulnerable to an expression injection in Actions, allowing an attacker t

Q: How urgent is CVE-2024-21623?

Priority 61/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2024-21623 is a critical-severity flaw (CVSS 9.8) affecting otclient. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OTCLient is an alternative tibia client for otserv. Prior to commit db560de0b56476c87a2f967466407939196dd254, the /mehah/otclient "`Analysis - SonarCloud`" workflow is vulnerable to an expression injection in Actions, allowing an attacker to run commands remotely on the runner, leak secrets, and alter the repository using this workflow. Commit db560de0b56476c87a2f967466407939196dd254 contains a fix for this issue.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-74
Published	2024-01-02
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: mehah

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-01-02 21:15 UTCPublished CVE record published
2026-06-17 07:09 UTCUpdated Record last modified

mehah otclient UPGRADE

Affected: < 2023-12-30

Fixed in: 2023-12-30

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2023-12-30 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade otclient

Note

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

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-2024-21623?

otclient: upgrade to 2023-12-30. Exact commands for each OS are on this page.

Is CVE-2024-21623 being exploited?

CVE-2024-21623 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-2024-21623 affect?

CVE-2024-21623 affects otclient. Severity is critical (CVSS 9.8). OTCLient is an alternative tibia client for otserv. Prior to commit db560de0b56476c87a2f967466407939196dd254, the /mehah/otclient "`Analysis - SonarCloud`" workflow is vulnerable to an expression injection in Actions, allowing an attacker t

How urgent is CVE-2024-21623?

Priority 61/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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