CVE-2009-4492

Name: CVE-2009-4492
Creator: NVD / NIST
Published: 2010-01-13T20:30:00.53+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 16.10%

Last modified Jun 16, 2026

CVE-2009-4492 is a vulnerability of currently unknown severity. WEBrick 1.3.1 in Ruby 1.8.6 through patchlevel 383, 1.8.7 through patchlevel 248, 1.8.8dev, 1.9.1 through patchlevel 376, and 1.9.2dev writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.. EPSS estimates a 16.10% chance of exploitation in the next 30 days.

Description

WEBrick 1.3.1 in Ruby 1.8.6 through patchlevel 383, 1.8.7 through patchlevel 248, 1.8.8dev, 1.9.1 through patchlevel 376, and 1.9.2dev writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.

Metrics

EPSS Probability

16.10%

96.5th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Ruby-Lang	Webrick	1.3.1

References

http://secunia.com/advisories/37949Not Applicable, Vendor Advisory
http://securitytracker.com/id?1023429Broken Link, Exploit, Third Party Advisory, VDB Entry
http://www.redhat.com/support/errata/RHSA-2011-0908.htmlThird Party Advisory
http://www.redhat.com/support/errata/RHSA-2011-0909.htmlThird Party Advisory
http://www.ruby-lang.org/en/news/2010/01/10/webrick-escape-sequence-injectionPatch, Vendor Advisory
http://www.securityfocus.com/archive/1/508830/100/0/threadedBroken Link, Third Party Advisory, VDB Entry
http://www.securityfocus.com/bid/37710Broken Link, Exploit, Third Party Advisory, VDB Entry
http://www.ush.it/team/ush/hack_httpd_escape/adv.txtBroken Link, Exploit
http://www.vupen.com/english/advisories/2010/0089Permissions Required
http://secunia.com/advisories/37949Not Applicable, Vendor Advisory
http://securitytracker.com/id?1023429Broken Link, Exploit, Third Party Advisory, VDB Entry
http://www.redhat.com/support/errata/RHSA-2011-0908.htmlThird Party Advisory
http://www.redhat.com/support/errata/RHSA-2011-0909.htmlThird Party Advisory
http://www.ruby-lang.org/en/news/2010/01/10/webrick-escape-sequence-injectionPatch, Vendor Advisory
http://www.securityfocus.com/archive/1/508830/100/0/threadedBroken Link, Third Party Advisory, VDB Entry
http://www.securityfocus.com/bid/37710Broken Link, Exploit, Third Party Advisory, VDB Entry
http://www.ush.it/team/ush/hack_httpd_escape/adv.txtBroken Link, Exploit
http://www.vupen.com/english/advisories/2010/0089Permissions Required

Timeline

Published: Jan 13, 2010
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2009-4492?

How severe is CVE-2009-4492?

Severity scoring for CVE-2009-4492 is pending analysis. The EPSS model estimates a 16.10% probability of exploitation in the next 30 days.

How do I fix CVE-2009-4492?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2009-4492?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST