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Vulnerability record · CVE-2009-1135 · published 15 July 2009

CVE-2009-1135: Microsoft isa server permissions and access controls vulnerability

Microsoft · Isa Server

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."

9.0 CVSS 2.0 High EPSS 26% · top 2.1% CWE-264 · Permissions and access controls
9.0CVSS 2.0 base score
26%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
12References
16 Jun 2026Last modified by NVD

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."

AV:N/AC:L/Au:S/C:C/I:C/A:C

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://secunia.com/advisories/35784
http://www.securitytracker.com/id?1022547
http://www.us-cert.gov/cas/techalerts/TA09-195A.html US Government Resource
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 US Government Resource
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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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2009-1135), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.