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CVE-2002-1973

50
FAUCET Score

CVE-2002-1973 describes a buffer overflow vulnerability in the ISAPI extension (Isapi.cpp) of CHttpServer::OnParseError, specifically when built with Microsoft Foundation Class (MFC) static libraries in Visual C++ 5.0 and 6.0 (before SP3). This flaw affects products like BadBlue and allows remote attackers to trigger a denial of service through an access violation and crash, with potential for arbitrary code execution, by submitting a long query string that causes a parsing error. With a CVSS score of 7.5, it is considered highly severe due to its network-based attack vector, low attack complexity, and potential for complete compromise of confidentiality, integrity, and availability. While not listed in CISA's KEV catalog and lacking Metasploit or Nuclei modules, an ExploitDB entry (EDB-21601) exists, indicating public exploit code availability, though there is no evidence of active exploitation or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
7.0CPE matchmatch criteria
cpe:2.3:a:microsoft:foundation_class_library:7.0:*:*:*:*:*:*:*
personal_1.7.3CPE matchmatch criteria
cpe:2.3:a:working_resources_inc.:badblue:personal_1.7.3:*:*:*:*:*:*:*

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
40.05%
Probability of exploitation in next 30 days
EPSS Percentile
98.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
ExploitDB: EDB-21601 · Jul 8, 2002
This CVE's current EPSS score of 0.4005 is in the 97th percentile among its peer group of 51,485 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

archives.neohapsis.com / archives/bugtraq/2002-07/0082.html
archives.neohapsis.com / archives/bugtraq/2002-07/0135.html
Exploit
archives.neohapsis.com / archives/bugtraq/2002-07/0144.html
archives.neohapsis.com / archives/bugtraq/2002-07/0145.html
Patch
exchange.xforce.ibmcloud.com / vulnerabilities/9529
support.microsoft.com / default.aspx
support.microsoft.com / default.aspx
securityfocus.com / bid/5188
Exploit