CVE-2010-20119

HIGH

CommuniCrypt Mail <=1.16 - Buffer Overflow

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 2 public exploits for CVE-2010-20119. PoCs published by Lincoln, Lincoln, dookie, including Metasploit module exploits/windows/browser/communicrypt_mail_activex.

AI-analyzed exploit summary This exploit targets a SEH overflow vulnerability in CommuniCrypt Mail 1.16 via the ANSMTP.dll/AOSMTP.dll ActiveX control. It uses a crafted payload to overwrite the SEH handler and execute shellcode.

Description

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.

Exploits (2)

exploitdb WORKING POC VERIFIED
by Lincoln · htmlremotewindows
https://www.exploit-db.com/exploits/12663

This exploit targets a SEH overflow vulnerability in CommuniCrypt Mail 1.16 via the ANSMTP.dll/AOSMTP.dll ActiveX control. It uses a crafted payload to overwrite the SEH handler and execute shellcode.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: CommuniCrypt Mail 1.16 (ANSMTP.dll/AOSMTP.dll)
No auth needed
Prerequisites: Victim must open the malicious HTML file in a browser with ActiveX enabled
devstral-2 · analyzed Feb 16, 2026 Full analysis →
metasploit WORKING POC GREAT
by Lincoln, dookie · rubypocwin
https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/browser/communicrypt_mail_activex.rb

This Metasploit module exploits a stack buffer overflow in CommuniCrypt Mail 1.16's ActiveX control (ANSMTP.dll/AOSMTP.dll) via the 'AddAttachments()' method. It delivers a crafted payload through an HTML page with embedded JavaScript to trigger arbitrary code execution.

Classification
Working Poc 100%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: CommuniCrypt Mail 1.16
No auth needed
Prerequisites: Victim must visit a malicious webpage or open a malicious HTML file · ActiveX control must be installed and enabled
devstral-2 · analyzed Feb 19, 2026 Full analysis →

Scores

CVSS v4 8.6
EPSS 0.0106
EPSS Percentile 59.9%
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact total

Details

CWE
CWE-121
Status published
Products (1)
CommuniCrypt Software/CommuniCrypt Mail < 1.16
Published Aug 21, 2025
Tracked Since Feb 18, 2026