CVE-2009-4492

Exp

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.

Published: 2010-01-13 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2009-4492 is rated High Exploit Risk (73.8/100): CVSS High severity, with high exploitation likelihood (EPSS 15.97%, 96th percentile). 4 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2009-4492

EDB-ID Source Kind Published Link
33489 exploit_db edb 2010-01-11 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2009-4492

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 21.10% 15.97% -5.13%
2 2026-06-04 18.18% 21.10% +2.92%
3 2026-06-03 — 18.18% —

Full EPSS history (33 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2009-4492

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2009-4492

GitHub Security Advisory for CVE-2009-4492

GHSA-6mq2-37j5-w6r6 · Severity: medium · Ecosystem: rubygems — WEBrick Improper Input Validation vulnerability

OS Trackers for CVE-2009-4492

vendor priority summary link
gentoo normal CVE-2009-4492: 1 GLSA(s) (201001-09), 1 atom(s) (dev-lang/ruby); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2009-4492
redhat low — https://access.redhat.com/security/cve/CVE-2009-4492
ubuntu negligible CVE-2009-4492 negligible priority: Ubuntu including 3 source packages (ruby1.8, ruby1.9, ruby1.9.1), 30 status rows across 10 suites (dapper, hardy, intrepid, jaunty, karmic, lucid, maverick, natty, oneiric, upstream): ignored 8, not-affected 8, DNE 7, released 6, needs-triage 1. https://ubuntu.com/security/CVE-2009-4492

Vendor comments (NVD) for CVE-2009-4492

  • Red Hat (2010-01-21T00:00:00)

    Red Hat is aware of this issue and is tracking it via the following bug: https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2009-4492 The Red Hat Security Response Team has rated this issue as having low security impact, a future update may address this flaw.

Affected software / configurations for CVE-2009-4492

Vendor Product Version Raw CPE
ruby-lang webrick 1.3.1 cpe:2.3:a:ruby-lang:webrick:1.3.1:*:*:*:*:ruby:*:*

References for CVE-2009-4492

cvelogic Threat Intelligence