What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-01-13 · updated 2026-06-17
• Weakness: CWE-121

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.

Affected products

• Inbit Messenger: from 4.6.0 through 4.9.0

References

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

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