CVE-2009-4492
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…
- 7.5HighCVSS base score
- 16.2%Exploitation in 30 daysEPSS · top 3.0% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- 1Public exploitsMetasploit, Nuclei and Exploit-DB
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.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. The public collections list an Exploit-DB entry for it.
Show the exploits1
Exploit-DB1 entry
- Ruby 1.9.1 - WEBrick 'Terminal Escape Sequence in Logs' Command Injection (Exploit-DB entry) (opens in a new tab)
EDB-ID 33489remote, multiplepublished 11 Jan 2010Verified
Modules, templates and exploits as listed by the Metasploit Framework (BSD-3-Clause), ProjectDiscovery's Nuclei templates (MIT) and the Exploit Database (GPLv2), read once a day. Where the data comes from
Timeline
ID reserved
By mitre
- 14 days later
· 14 days later
Published
- 15 years later
· 15 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | High7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
- EPSS (exploitation in 30 days)
- 16.2% · top 3.0% of all CVEs (11 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
n/a
- affected n/a
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- RubyGemswebrickGHSA-6mq2-37j5-w6r6 (opens in a new tab)
References
References9
- http://www.ruby-lang.org/en/news/2010/01/10/webrick-escape-sequence-injection (opens in a new tab)x_refsource_CONFIRMx_transferred
- RHSA-2011:0909 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- 37949 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- ADV-2010-0089 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
- RHSA-2011:0908 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- http://www.ush.it/team/ush/hack_httpd_escape/adv.txt (opens in a new tab)x_refsource_MISCx_transferred
- 37710 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- 20100110 Nginx, Varnish, Cherokee, thttpd, mini-httpd, WEBrick, Orion, AOLserver, Yaws and Boa log escape sequence injection (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- 1023429 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2017-0178 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-6mq2-37j5-w6r6 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2009-4492)Record last updated .