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

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CRITICAL 9.8REMOTEUPGRADE

CVE-2023-54330 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 versions 4.6.0 to 4.9.0 contain a remote stack-based buffer overflow vulnerability that allows unauthenticated attackers to execute arbitrary code by sending malformed network packets. Attackers can craft a specially designed payload targeting the messenger's network handler to overwrite the Structured Exception Handler (SEH) and execute shellcode on vulnerable Windows systems.

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	0.8% (top 43%)
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 23:16 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/51126

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-2023-54330?

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

Is CVE-2023-54330 being exploited?

CVE-2023-54330 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-2023-54330 affect?

CVE-2023-54330 affects inbit messenger. Severity is critical (CVSS 9.8). Inbit Messenger versions 4.6.0 to 4.9.0 contain a remote stack-based buffer overflow vulnerability that allows unauthenticated attackers to execute arbitrary code by sending malformed network packets. Attackers can craft a specially designe

How urgent is CVE-2023-54330?

Priority 61/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

Windows vulnerabilities

Related CVEs

CVE-2023-54329 CRITICAL 9.8 UPGRADE Inbit Messenger 4.6.0 - 4.9.0 contains a remote command execution vulnerability that allows unauthenticated at

References

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