CVE-2020-37221 Atomic Alarm Clock 6.3 Stack Overflow via SEH Unicode
Local attackers can execute arbitrary code via a stack overflow in the Time Zones Clock configuration display name field.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-37221?
CVE-2020-37221 is a high-severity memory corruption vulnerability in Drive-software Atomic Alarm Clock, published on 13 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Atomic Alarm Clock 6.3 contains a stack overflow vulnerability that allows local attackers to execute arbitrary code by supplying a malicious string to the display name textbox in the Time Zones Clock configuration. Attackers can craft a buffer with structured exception handling overwrite and encoded shellcode to bypass SafeSEH protections and execute arbitrary commands with application privileges.
Weakness: CWE-121
Which versions are affected by CVE-2020-37221?
How do I fix CVE-2020-37221?
No fix has been published for CVE-2020-37221 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-2020-37221 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-37221 exists.
Sources
Also known as GHSA-q8c2-hv55-wmr4.