Is CVE-2020-37221 actively exploited?

No active exploitation of CVE-2020-37221 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-37221 be exploited remotely?

No. CVE-2020-37221 requires local access to exploit.

What is the CVSS score of CVE-2020-37221?

CVE-2020-37221 has a CVSS score of 8.4 (HIGH).

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HIGH

CVE-2020-37221

CWE-121Published: May 13, 2026· Updated: May 13, 2026

8.4

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:1.9th

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.

NVD Source

Technical Analysis

CVE-2020-37221 requires local access, meaning attackers must already have a foothold on the target system.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.4.