CVE-2010-20119

CommuniCrypt Mail <= 1.16 ANSMTP/AOSMTP ActiveX Control Buffer Overflow

CommuniCrypt Mail versions up to and including 1.16 contains a stack-based buffer overflow vulnerability in its ANSMTP.dll and AOSMTP.dll ActiveX controls, specifically within the AddAttachments() method. This method fails to properly validate the length of input strings, allowing data to exceed the bounds of a fixed-size stack buffer. When invoked with an overly long string, the control can corrupt adjacent memory structures, including exception handlers, leading to potential control flow disruption.

Affected

CommuniCrypt Software · CommuniCrypt Mail

CVSS v4.0 VULNCHECK

8.6 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS

1.62% chance of exploitation in the next 30 days, 76th percentile

Published

2025-08-21

Updated

2026-05-15

Proof-of-concept exploits (2)

• https://www.exploit-db.com/exploits/12663
• https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/win…

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/exploits/windows/browser/communicrypt_mai…

References

• CVE Record
• NVD entry