Buffer overflow in Inbit Messenger
CVE-2023-54330
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (54.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.008 · change: +0.001
Affected products
- Inbit Messenger — versions 4.6.0
- Inbit Messenger
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/51126 (Exploit, Third Party Advisory, exploit)
- web.archive.org/web/20200122082432/https://www.softsea.com/review/Inbit-Messeng… (Product, product)
- github.com/a-rey/exploits/blob/main/writeups/Inbit_Messenger/v4.6.0/writeup.md (Exploit, technical-description, Third Party Advisory)
- www.vulncheck.com/advisories/inbit-messenger-unauthenticated-remote-seh-overflow (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2023-54330?
- CVE-2023-54330 is a critical-severity vulnerability in Inbit Messenger, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-01-13.
- How severe is CVE-2023-54330?
- Critical severity. CVSS v3 base score is 9.8 out of 10.