CVE-2002-0840: Apache HTTP Server

Medium severity, CVSS 6.8. EPSS: 95.1% chance of exploitation in the next 30 days.

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.

Affected products

• Apache HTTP Server: version 1.3 only; version 1.3.1 only; version 1.3.3 only; version 1.3.4 only; version 1.3.6 only; version 1.3.9 only; …
• Oracle Application Server: version 1.0.2 only; version 1.0.2.1s only; version 1.0.2.2 only; version 9.0.2 only; version 9.0.2.1 only
• Oracle Database Server: version 8.1.7 only; version 9.2.1 only; version 9.2.2 only
• Oracle ORACLE8I: version 8.1.7 only; version 8.1.7.1 only; version 8.1.7_.0.0_enterprise only; version 8.1.7_.1.0_enterprise only
• Oracle ORACLE9I: version 9.0 only; version 9.0.1 only; version 9.0.1.2 only; version 9.0.1.3 only; version 9.0.2 only

Published 2002-10-11. Last modified 2026-06-16.