Is CVE-2003-0526 being actively exploited?

CVE-2003-0526 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2003-0526?

CVE-2003-0526 has a CVSS 2.0 base score of 6.8 (MEDIUM).

CVE-2003-0526

MEDIUM · CVSS 6.8EPSS 22.5%EU EUVD

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."

Key facts

CVSS score: 6.8 (v2.0)
Severity: MEDIUM
CVSS vector: AV:N/AC:M/Au:N/C:P/I:P/A:P
EPSS score: 22.5% (98th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2003-0520)
Published: August 18, 2003
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2003-0520 in the EU Vulnerability Database. Last updated in EUVD on August 8, 2024.

View on the EU Vulnerability Database

Affected products

microsoft / isa server
microsoft / isa server
microsoft / isa server

Certified products that may be affected

1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.

ISA Server 2000 with Service Pack 1 and Feature Pack 1, Firewall - Microsoft Corporation - Common Criteria BSI-DSZ-CC-0218-2003 - archived

References

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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