CVE-2002-0840

mediumpriority · attend · 70EPSS 0.951 · 100 %ileexploit · functionalEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · functional

Likely / severe?

95.1% (100th) EPSS

CVSS 6.8 · medium

Is it mine?

53 products

Check your exposure

Who says so?

3 sources

enisa_euvd · nvd · redhat_csaf

EPSS · scored 2026-10-23

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedRed Hat Stronghold 3redhat_csaf
Backported fixes are available for the versions of Apache, mod_ssl, and PHP included in Stronghold 3. Stronghold 3 build code 3020 is now available which includes this fix, and can be downloaded from the following URL: http://stronghold.redhat.com/sh3/ For information on how to upgrade between releases of Stronghold 3, refer to the following URL: http://stronghold.redhat.com/support/upgrade-sh3.xml
https://access.redhat.com/errata/RHSA-2002:243
FixedRed Hat Stronghold 4redhat_csaf
We have backported the security fixes for the versions of OpenSSL and mm included in Stronghold 4. The fixed packages are now available via the update agent service; run $ bin/agent from the Stronghold 4 install root to upgrade an existing Stronghold 4 installation to the new package versions. After upgrading Stronghold, the server must be completely restarted by running the following commands from the install root: $ bin/stop-server $ bin/start-server For more information on how to upgrade between releases of Stronghold 4, see http://stronghold.redhat.com/support/upgrade-sh4
https://access.redhat.com/errata/RHSA-2002:244
FixedStronghold 4 for Red Hat Enterprise Linuxredhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. To update all RPMs for your particular architecture, run: rpm -Fvh [filenames] where [filenames] is a list of the RPMs you wish to upgrade. Only those RPMs which are currently installed will be updated. Those RPMs which are not installed but included in the list will not be updated. Note that you can also use wildcards (*.rpm) if your current directory *only* contains the desired RPMs. Please note that this update is also available via Red Hat Network. Many people find this an easier way to apply updates. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system.
https://access.redhat.com/errata/RHSA-2002:248
FixedRed Hat Enterprise Linux AS (Advanced Server) version 2.1 redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. Please note that this update is available via Red Hat Network. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system. After the errata packages are installed, restart the Web service by running the following command: /sbin/service httpd restart
https://access.redhat.com/errata/RHSA-2002:251
FixedRed Hat Linux Advanced Workstation 2.1redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. Please note that this update is available via Red Hat Network. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system. After the errata packages are installed, restart the Web service by running the following command: /sbin/service httpd restart
https://access.redhat.com/errata/RHSA-2002:251
FixedRed Hat Linux 7.1redhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. To update all RPMs for your particular architecture, run: rpm -Fvh [filenames] where [filenames] is a list of the RPMs you wish to upgrade. Only those RPMs which are currently installed will be updated. Those RPMs which are not installed but included in the list will not be updated. Note that you can also use wildcards (*.rpm) if your current directory *only* contains the desired RPMs. Please note that this update is also available via Red Hat Network. Many people find this an easier way to apply updates. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system.
https://access.redhat.com/errata/RHSA-2003:106

cvss

Technical severity, 0–10. One row per scoring source.

6.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 6.4

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:P/E:Hsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USLLM-inferred

exploits (1)

Public proof-of-concept and weaponised exploit code.

EDB-21885Apache 1.3/2.0.x - Server Side Include Cross-Site Scriptingfunctional · exploit_db

affected products (53)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
apache http server= 1.3nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.1nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.11nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.12nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.14nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.17nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.18nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.19nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.20nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.22nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.23nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.24nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.25nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.26nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.3nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.4nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.6nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 1.3.9nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
apache http server= 2.0nvdUScpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*

showing 20 of 53

advisories (5)

Vendor and ecosystem advisories describing this.

RHSA-2002:243Red Hat Security Advisory: apache, mod_ssl, php security update for Stronghold2002-11-08csaf · redhat_csafUS
Updated versions of the Apache HTTP server, PHP, and mod_ssl are now available which close possible buffer overflows in the Apache HTTP server benchmarking tool, fixes two cross-site scripting vulnerabilities in the error pages, and fix possible local privilege escalation. These updates also fix vulnerabilities in the PHP mail() function that allows script authors to bypass safe mode restrictions, and possibly allow remote attackers to insert arbitrary mail headers and content into messages.
RHSA-2002:244Red Hat Security Advisory: apache, mod_ssl, php security update for Stronghold2002-11-08csaf · redhat_csafUS
Updated versions of the Apache HTTP server, PHP, and mod_ssl are now available which close possible buffer overflows in the Apache HTTP server benchmarking tool, fix two cross-site scripting vulnerabilities in the error pages, and fix possible local privilege escalation. These updates also fix vulnerabilities in the PHP mail() function that allows script authors to bypass safe mode restrictions, and possibly allow remote attackers to insert arbitrary mail headers and content into messages.
RHSA-2002:248Red Hat Security Advisory: apache, mod_ssl, php security update for Stronghold2002-11-07csaf · redhat_csafUS
Updated versions of the Apache HTTP server, PHP, and mod_ssl are now available which close possible buffer overflows in the Apache HTTP server benchmarking tool, fixes two cross-site scripting vulnerabilities in the error pages, and fix possible local privilege escalation. These updates also fix vulnerabilities in the PHP mail() function that allows script authors to bypass safe mode restrictions, and possibly allow remote attackers to insert arbitrary mail headers and content into messages.
RHSA-2002:251Red Hat Security Advisory: apache security update2003-01-09csaf · redhat_csafUS
Updated apache and httpd packages are available which fix a number of security issues for Red Hat Linux Advanced Server 2.1. [Updated 06 Feb 2003] Added fixed packages for Advanced Workstation 2.1
RHSA-2003:106Red Hat Security Advisory: : : : Updated apache and mod_ssl packages available2003-04-22csaf · redhat_csafUS
Updated Apache and mod_ssl packages which fix a number of security issues are now available for iSeries and pSeries systems.

also known as (2)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

enisa_euvd nvd redhat_csaf NVD CVE.org MITRE

published 2002-10-11modified 2026-06-16

references (72)

External citations — patches, advisories, analysis.

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