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Description

COMMAX UMS Client ActiveX Control 1.7.0.2 contains a heap-based buffer overflow vulnerability that allows attackers to execute arbitrary code by providing excessively long string arrays through multiple functions. Attackers can exploit improper boundary validation in CNC_Ctrl.dll to cause heap corruption and potentially gain system-level access.

PUBLISHED Reserved 2025-12-05 | Published 2025-12-09 | Updated 2025-12-10 | Assigner VulnCheck




HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-787: Out-of-bounds Write

Product status

Default status
unaffected

1.7.0.2
affected

Credits

LiquidWorm as Gjoko Krstic of Zero Science Lab finder

References

www.exploit-db.com/exploits/50232 (ExploitDB-50232) exploit

www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5664.php (Zero Science Lab Disclosure (ZSL-2021-5664)) third-party-advisory

www.commax.com (Reference) technical-description

www.vulncheck.com/...ntrol-cnc-ctrl-dll-heap-buffer-overflow (VulnCheck Advisory: CNC_Ctrl DllUnregisterServer Access Violation) third-party-advisory

cve.org (CVE-2021-47705)

nvd.nist.gov (CVE-2021-47705)

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