CVE-2009-1135

What it is

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."

At a glance

Exploitability

Can be exploited over the network with a login. High risk of data exposure, data tampering, service disruption.

Exploit odds

26.5% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2009-03-25 00:00 UTC ReservedThe CVE id was reserved by its CNA
2. 2009-07-15 15:30 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2026-06-16 23:06 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 26.5% in the next 30 days (EPSS).
• Severity: 9.0 HIGH (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2009-07-15 15:30 UTC

Last modified

2026-06-16 23:06 UTC

Exploit probability

26.5% · EPSS, next 30 days

Weakness

CWE-264

Record status

Modified

Affected

• Microsoft Isa Server 2006

Attack profile CVSS 2.0 · 9.0

Attack vector

Network

Complexity

Low

Authentication

Single

Confidentiality

Complete

Integrity

Complete

Availability

Complete

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2009-1135.md and follow it. Check whether this project is affected by CVE-2009-1135. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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