CVE-2010-20119 CommuniCrypt Mail <= 1.16 ANSMTP/AOSMTP ActiveX Control Buffer Overflow
A stack-based buffer overflow in CommuniCrypt Mail's ActiveX controls allows attackers to execute arbitrary code via crafted input.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2010-20119?
CVE-2010-20119 is a high-severity memory corruption vulnerability in CommuniCrypt Mail, published on 21 Aug 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-121
Which versions are affected by CVE-2010-20119?
How do I fix CVE-2010-20119?
No fix has been published for CVE-2010-20119 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2010-20119 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2010-20119 exists.
Public exploit code: 1 Metasploit module.
Sources
Also known as GHSA-mcx6-3vph-g228.