Critical severity · published Jan 13, 2026
CVE-2023-54330
Inbit Messenger 4.9.0 - Unauthenticated Remote SEH Overflow
9.8
CVSS
0.8%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 57% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
IM
Inbit Messenger · Inbit
4.6.0 through 4.9.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-54330
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-54330
Exploit
https://github.com/a-rey/exploits/blob/main/writeups/Inbit_Messenger/v4.6.0/writeup.md
Product
https://web.archive.org/web/20200122082432/https://www.softsea.com/review/Inbit-Messenger-Basic-Edition.html
Exploit
https://www.exploit-db.com/exploits/51126
Third Party Advisory
https://www.vulncheck.com/advisories/inbit-messenger-unauthenticated-remote-seh-overflow
More from Inbit Messenger
9.8
CVE-2023-54329
Inbit Messenger 4.9.0 - Unauthenticated Remote Command Execution (RCE)