CVE-2002-0840

CVE-2002-0840 is a medium-severity vulnerability in Apache Http Server with a CVSS 2.0 base score of 6.8. Its EPSS exploit-prediction score of 94% places it in the 100th percentile, indicating an elevated likelihood of exploitation.

Key facts

Description

Cross-site scripting (XSS) vulnerability in the default error page of Apache 2.0 before 2.0.43, and 1.3.x up to 1.3.26, when UseCanonicalName is "Off" and support for wildcard DNS is present, allows remote attackers to execute script as other web page visitors via the Host: header, a different vulnerability than CAN-2002-1157.

Frequently asked questions

What is CVE-2002-0840?
Cross-site scripting (XSS) vulnerability in the default error page of Apache 2.0 before 2.0.43, and 1.3.x up to 1.3.26, when UseCanonicalName is "Off" and support for wildcard DNS is present, allows remote attackers to execute script as other web page visitors via the Host: header, a different vulnerability than CAN-2002-1157.
How severe is CVE-2002-0840?
CVE-2002-0840 has a CVSS 2.0 base score of 6.8, rated medium severity.
Is CVE-2002-0840 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 94% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2002-0840?
CVE-2002-0840 primarily affects Apache Http Server. In total, 47 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2002-0840?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2002-0840 published?
CVE-2002-0840 was published on 2002-10-11 and last updated on 2026-06-16.

References

Affected products (47)

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