THREATPORT/VULNERABILITY/CVE-2009-1135
HIGH SEVERITY

CVE-2009-1135

Isa Server vulnerability

CVSS
9.0
EPSS
26.5%
EPSS pct
98th
Exploited
No known
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 vendor
Microsoft
Affected product
Isa Server
CVSS vector
AV:N/AC:L/Au:S/C:C/I:C/A:C
Weakness type (CWE)
  • CWE-264 — Permissions, Privileges, and Access Controls
Published
2009-07-15

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring single-factor authentication. Successful exploitation leads to complete impact to confidentiality, complete impact to integrity, complete impact to availability.

Its EPSS score of 26.5% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 98% of all scored CVEs.

Check your external exposure to CVE-2009-1135

  • Confirm whether Microsoft Isa Server is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2009-1135.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2009-1135

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2009-1135 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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