How severe is CVE-2002-1973?

CVE-2002-1973 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2002-1973 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 40% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2002-1973?

CVE-2002-1973 primarily affects Microsoft Foundation Class Library. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2002-1973?

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-2002-1973 published?

CVE-2002-1973 was published on 2002-12-31 and last updated on 2026-06-16.

CVE-2002-1973

CVE-2002-1973 is a high-severity vulnerability in Microsoft Foundation Class Library with a CVSS 2.0 base score of 7.5. Its EPSS exploit-prediction score of 40% 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: 40% (98th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Foundation Class Library
Published: 2002-12-31
Last modified: 2026-06-16

Description

Buffer overflow in CHttpServer::OnParseError in the ISAPI extension (Isapi.cpp) when built using Microsoft Foundation Class (MFC) static libraries in Visual C++ 5.0, and 6.0 before SP3, as used in multiple products including BadBlue, allows remote attackers to cause a denial of service (access violation and crash) and possibly execute arbitrary code via a long query string that causes a parsing error.

Frequently asked questions

What is CVE-2002-1973?: Buffer overflow in CHttpServer::OnParseError in the ISAPI extension (Isapi.cpp) when built using Microsoft Foundation Class (MFC) static libraries in Visual C++ 5.0, and 6.0 before SP3, as used in multiple products including BadBlue, allows remote attackers to cause a denial of service (access violation and crash) and possibly execute arbitrary code via a long query string that causes a parsing error.
How severe is CVE-2002-1973?: CVE-2002-1973 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2002-1973 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 40% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2002-1973?: CVE-2002-1973 primarily affects Microsoft Foundation Class Library. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2002-1973?: 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-2002-1973 published?: CVE-2002-1973 was published on 2002-12-31 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:microsoft:foundation_class_library:7.0:*:*:*:*:*:*:*
cpe:2.3:a:working_resources_inc.:badblue:personal_1.7.3:*:*:*:*:*:*:*