CVE-2009-0085
The Secure Channel (aka SChannel) authentication component in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP1 and SP2, Vista Gold and SP1, and Server 2008, when certificate authentication is used, does not properly validate the client's key…
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 15.2%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.
Description
The Secure Channel (aka SChannel) authentication component in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP1 and SP2, Vista Gold and SP1, and Server 2008, when certificate authentication is used, does not properly validate the client's key exchange data in Transport Layer Security (TLS) handshake messages, which allows remote attackers to spoof authentication by crafting a TLS packet based on knowledge of the certificate but not the private key, aka "SChannel Spoofing Vulnerability."
- CVSS 2.0
- 7.1 HIGHAV:N/AC:M/Au:N/C:N/I:C/A:N
- EPSS
- 15.19% probability · 97th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-287
- Affected
- microsoft/windows 2000 · microsoft/windows server 2003 · microsoft/windows server 2008 · microsoft/windows vista · microsoft/windows xp
- Source
- secure@microsoft.com
EPSS 15.2% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://osvdb.org/52521
- http://secunia.com/advisories/34215
- http://www.securitytracker.com/id?1021828
- http://www.us-cert.gov/cas/techalerts/TA09-069A.htmlUS Government Resource
- http://www.vupen.com/english/advisories/2009/0660
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-007
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6011
- http://osvdb.org/52521
- http://secunia.com/advisories/34215
- http://www.securitytracker.com/id?1021828
- http://www.us-cert.gov/cas/techalerts/TA09-069A.htmlUS Government Resource
- http://www.vupen.com/english/advisories/2009/0660
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-007
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6011
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.