CVE-2023-54329: Inbit Messenger 4.6.0 - 4.9.0 contains a remote command execution vulnerability that allows unauthenticated at

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CRITICAL 9.8REMOTEUPGRADE

CVE-2023-54329 is a critical-severity flaw (CVSS 9.8) affecting inbit messenger. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Inbit Messenger 4.6.0 - 4.9.0 contains a remote command execution vulnerability that allows unauthenticated attackers to execute arbitrary commands by exploiting a stack overflow in the messenger's protocol. Attackers can send specially crafted XML packets to port 10883 with a malicious payload to trigger the vulnerability and execute commands with system privileges.

Why this priority

Critical severity
Public exploit reference
CISA SSVC: automatable with total technical impact
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 32%)
CISA exploited list	No
Weakness	CWE-121, CWE-787
Published	2026-01-13
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: inbit

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

Am I affected?

Timeline

2026-01-13 23:15 UTCPublished CVE record published
2026-06-17 06:47 UTCUpdated Record last modified

inbit inbit messenger UPGRADE

Affected: >= 4.6.0 and <= 4.9.0

Fixed in: newer than 4.9.0

Safe to downgrade to: a release before 4.6.0

1. Check installed version

apt-cache policy inbit-messenger || rpm -q inbit-messenger || inbit-messenger --version

2. UPGRADE to newer than 4.9.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade inbit-messenger

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade inbit-messenger

Note

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

3. If no update is available yet, DOWNGRADE to a release before 4.6.0 (Debian / Ubuntu)

apt-cache madison inbit-messenger sudo apt install inbit-messenger=<VERSION_BEFORE_4.6.0> sudo apt-mark hold inbit-messenger

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list inbit-messenger sudo dnf downgrade inbit-messenger-<VERSION_BEFORE_4.6.0> sudo dnf versionlock add inbit-messenger

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.

Exact fixes by distribution

Fedora 46 · jgmenu · FIXED · 4.7.0-1.fc46 · FEDORA-2026-3053ee4399 · source

sudo dnf upgrade --advisory=FEDORA-2026-3053ee4399

Fedora ELN · python-tkrzw · FIXED · 0.1.32-12.eln159 · FEDORA-2026-0161d71544 · source

sudo dnf upgrade --advisory=FEDORA-2026-0161d71544

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/a-rey/exploits/blob/main/writeups/Inbit_Messenger/v4.6.0/writeup.md
Write-up: www.exploit-db.com/exploits/51127

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-2023-54329?

inbit messenger: upgrade to newer than 4.9.0. Exact commands for each OS are on this page.

Is CVE-2023-54329 being exploited?

CVE-2023-54329 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-2023-54329 affect?

CVE-2023-54329 affects inbit messenger. Severity is critical (CVSS 9.8). Inbit Messenger 4.6.0 - 4.9.0 contains a remote command execution vulnerability that allows unauthenticated attackers to execute arbitrary commands by exploiting a stack overflow in the messenger's protocol. Attackers can send specially cra

How urgent is CVE-2023-54329?

Priority 64/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-54330 CRITICAL 9.8 UPGRADE Inbit Messenger versions 4.6.0 to 4.9.0 contain a remote stack-based buffer overflow vulnerability that allows

References

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