Vulnerability · Published May 13, 2026 · Assigned by VulnCheck

CVE-2020-37221Atomic Alarm Clock 6.3 Stack Overflow via SEH Unicode

High 8.4

In plain English

A high-severity stack buffer overflow in Atomic Alarm Clock from Drive-software. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 4% of all known vulnerabilities).

Severity (CVSS 3.1)8.4High

Exploit odds (30 days)0.2%top 95.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
Drive-software	Atomic Alarm Clock	6.3

Weakness: CWE-121 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

ExploitDB-48346 exploit
VulnCheck Advisory: Atomic Alarm Clock 6.3 Stack Overflow via SEH Unicode third-party-advisory