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CVE-2001-0239

42
FAUCET Score

CVE-2001-0239 describes a denial-of-service vulnerability in Microsoft Internet Security and Acceleration (ISA) Server 2000 Web Proxy. Remote attackers can exploit this by sending a specially crafted, long web request. With a CVSS score of 7.5 (HIGH), this vulnerability is easily exploitable over the network with no authentication required, potentially leading to a complete denial of service, as well as possible partial confidentiality and integrity impacts. While there is no evidence of active exploitation or KEV listing, public exploit code exists in ExploitDB, though there is no significant community discussion or media coverage surrounding this older vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
2000CPE matchmatch criteria
cpe:2.3:a:microsoft:isa_server:2000:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.5HIGH

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

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
27.96%
Probability of exploitation in next 30 days
EPSS Percentile
97.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
ExploitDB: EDB-20763 · Apr 16, 2001
This CVE's current EPSS score of 0.2796 is in the 96th percentile among its peer group of 51,466 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

docs.microsoft.com / en-us/security-updates/securitybulletins/2001/ms01-021
exchange.xforce.ibmcloud.com / vulnerabilities/6383
ciac.org / ciac/bulletins/l-073.shtml
securityfocus.com / archive/1/176912
ExploitVendor Advisory
securityfocus.com / archive/1/177160
Vendor Advisory
securityfocus.com / archive/1/179986
ExploitVendor Advisory
securityfocus.com / bid/2600
ExploitPatchVendor Advisory