CVE-2009-1135

Severity: critical (CVSS 9.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 26.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2009-07-15 · updated 2026-06-16
Weakness: CWE-264

Description

Microsoft Internet Security and Acceleration (ISA) Server 2006 Gold and SP1, when Radius OTP is enabled, uses the HTTP-Basic authentication method, which allows remote attackers to gain the privileges of an arbitrary account, and access published web pages, via vectors involving attempted access to a network resource behind the ISA Server, aka "Radius OTP Bypass Vulnerability."

Affected products

Microsoft Isa Server: 2006, 2006-sp1, 2006-supportability

References

http://secunia.com/advisories/35784
http://www.securitytracker.com/id?1022547
http://www.us-cert.gov/cas/techalerts/TA09-195A.html
http://www.vupen.com/english/advisories/2009/1889
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-031
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5649
http://secunia.com/advisories/35784
http://www.securitytracker.com/id?1022547
http://www.us-cert.gov/cas/techalerts/TA09-195A.html
http://www.vupen.com/english/advisories/2009/1889
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-031
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5649

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