How severe is CVE-2001-0239?

CVE-2001-0239 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2001-0239 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 28% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-0239?

CVE-2001-0239 affects Microsoft Isa Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2001-0239?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2001-0239 published?

CVE-2001-0239 was published on 2001-07-02 and last updated on 2026-06-16.

CVE-2001-0239

CVE-2001-0239 is a high-severity vulnerability in Microsoft Isa Server with a CVSS 2.0 base score of 7.5. Its EPSS exploit-prediction score of 28% places it in the 98th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 28% (98th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Isa Server
Published: 2001-07-02
Last modified: 2026-06-16

Description

Microsoft Internet Security and Acceleration (ISA) Server 2000 Web Proxy allows remote attackers to cause a denial of service via a long web request with a specific type.

Frequently asked questions

What is CVE-2001-0239?: Microsoft Internet Security and Acceleration (ISA) Server 2000 Web Proxy allows remote attackers to cause a denial of service via a long web request with a specific type.
How severe is CVE-2001-0239?: CVE-2001-0239 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2001-0239 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 28% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-0239?: CVE-2001-0239 affects Microsoft Isa Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2001-0239?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2001-0239 published?: CVE-2001-0239 was published on 2001-07-02 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:microsoft:isa_server:2000:*:*:*:*:*:*:*

More vulnerabilities in Microsoft Isa Server

CVE-2006-7027 — Critical (CVSS 10.0): Microsoft Internet Security and Acceleration (ISA) Server 2004 logs unusual ASCII characters in the Host header,…
CVE-2009-1534 — Critical (CVSS 9.3): Buffer overflow in the Office Web Components ActiveX Control in Microsoft Office XP SP3, Office 2000 Web Components…
CVE-2009-0562 — Critical (CVSS 9.3): The Office Web Components ActiveX Control in Microsoft Office XP SP3, Office 2003 SP3, Office XP Web Components SP3,…
CVE-2009-1136 — Critical (CVSS 9.3): The Microsoft Office Web Components Spreadsheet ActiveX control (aka OWC10 or OWC11), as distributed in Office XP SP3…
CVE-2009-1135 — Critical (CVSS 9.0): Microsoft Internet Security and Acceleration (ISA) Server 2006 Gold and SP1, when Radius OTP is enabled, uses the…
CVE-2006-3652 — High (CVSS 7.5): Microsoft Internet Security and Acceleration (ISA) Server 2004 allows remote attackers to bypass file extension filters…

All CVEs affecting Microsoft Isa Server →