Critical 9.8Published Jan 13, 2026

CVE-2023-54330Inbit Messenger 4.9.0 - Unauthenticated Remote SEH Overflow

Updated under an hour ago (Oct 28, 2026, 11:40 AM ET)

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It affects Inbit Messenger and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Inbit Messenger

Exploited in the last 30 days

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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-121
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Analyzed
Record last updated: Mar 4, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Inbit Inbit Messenger inbit:messenger (from the name)	from 4.6.0 through 4.9.0	CNA record
inbit inbit_messenger inbit:inbit_messenger	from 4.6.0 through 4.9.0	NVD

References

References

https://www.exploit-db.com/exploits/51126	exploit, third-party-advisory
https://web.archive.org/web/20200122082432/https://www.softsea.com/review/Inbit-Messenger-Basic-Edition.html	product
https://github.com/a-rey/exploits/blob/main/writeups/Inbit_Messenger/v4.6.0/writeup.md	technical-description, exploit, third-party-advisory
https://www.vulncheck.com/advisories/inbit-messenger-unauthenticated-remote-seh-overflow	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.