CVE-2002-0840
MediumPublic exploitCross-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:…
Published Oct 11, 2002 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2002-0840
Key Facts
Patch immediately- CVE-2002-0840 is a medium-severity vulnerability (CVSS 6.8 v2) affecting HTTP Server (Apache), Application Server (Oracle), Database Server (Oracle) and 7 more products.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 95% probability of exploitation in the next 30 days.
- Fixed versions are available, including apache 1.3.26-0woody, apache-perl 1.3.26-1-1.26-0woody2, apache-ssl 1.3.26.1+1.48-0woody3.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v2
6.8
AV:N/AC:M/Au:N/C:P/I:P/A:P
EPSS (30-day exploit likelihood)
95%
Higher than 99.8% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2002-0840 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Affected Products
63 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| HTTP ServerApache | 1.3, 1.3.1, 1.3.11, 1.3.12, 1.3.14, 1.3.17, 1.3.18, 1.3.19 | n/a |
| Application ServerOracle | 1.0.2, 1.0.2.1s, 1.0.2.2, 9.0.2, 9.0.2.1, 9.0.2-r2 | n/a |
| Database ServerOracle | 8.1.7, 9.2.1, 9.2.2 | n/a |
| Oracle8iOracle | 8.1.7, 8.1.7_.0.0_enterprise, 8.1.7.1, 8.1.7_.1.0_enterprise | n/a |
| Oracle9iOracle | 9.0, 9.0.1, 9.0.1.2, 9.0.1.3, 9.0.2 | n/a |
Patched Releases
apache
1.3.26-0woody
apache-perl
1.3.26-1-1.26-0woody2
apache-ssl
1.3.26.1+1.48-0woody3
apache2
2.0.43-1
rootio-apache2
2.0.43-1
Timeline
Publicly disclosed
Oct 11, 2002
Last updated
Aug 4, 2026
References
- advisoryRHSA-2002:222
- advisoryRHSA-2002:243
- advisoryRHSA-2002:244
- advisoryRHSA-2002:248
- advisoryRHSA-2002:251
FAQ
Common Questions.
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-2…
Affected: HTTP Server (Apache) versions 1.3, 1.3.1, 1.3.11, 1.3.12, 1.3.14, 1.3.17, 1.3.18, 1.3.19; Application Server (Oracle) versions 1.0.2, 1.0.2.1s, 1.0.2.2, 9.0.2, 9.0.2.1, 9.0.2-r2; Database Server (Oracle) versions 8.1.7, 9.2.1, 9.2.2, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including apache 1.3.26-0woody, apache-perl 1.3.26-1-1.26-0woody2, apache-ssl 1.3.26.1+1.48-0woody3.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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