CVE-2003-0526

Isa Server vulnerability

CVSS

6.8

EPSS

22.5%

EPSS pct

97th

Exploited

No known

Cross-site scripting (XSS) vulnerability in Microsoft Internet Security and Acceleration (ISA) Server 2000 allows remote attackers to inject arbitrary web script via a URL containing the script in the domain name portion, which is not properly cleansed in the default error pages (1) 500.htm for "500 Internal Server error" or (2) 404.htm for "404 Not Found."

Affected vendor

Microsoft

Affected product

Isa Server

CVSS vector

AV:N/AC:M/Au:N/C:P/I:P/A:P

Published

2003-08-18

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, medium attack complexity, requiring no authentication. Successful exploitation leads to partial impact to confidentiality, partial impact to integrity, partial impact to availability.

Its EPSS score of 22.5% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 97% of all scored CVEs.

Check your external exposure to CVE-2003-0526

Confirm whether Microsoft Isa Server is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2003-0526.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2003-0526

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2003-0526 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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