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CVE-2008-1891

17
FAUCET Score

CVE-2008-1891 describes a directory traversal vulnerability in WEBrick, a Ruby web server, affecting various versions of Ruby 1.8.x and 1.9.0. This flaw allows remote attackers to read arbitrary CGI files by manipulating URIs with specific trailing characters, particularly on NTFS or FAT filesystems. The vulnerability has a CVSS score of 5.0, indicating a medium severity with a network attack vector, low attack complexity, and potential for partial confidentiality impact. While no known exploits or active exploitation have been reported, and community discussion is minimal, the vulnerability could still pose a risk if exploited in specific configurations.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.9.0CPE matchmatch criteria
cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*
1.8.5CPE matchmatch criteria
cpe:2.3:a:ruby-lang:ruby:1.8.5:*:*:*:*:*:*:*
1.8.6CPE matchmatch criteria
cpe:2.3:a:ruby-lang:ruby:1.8.6:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:P/I:N/A:N

Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.81%
Probability of exploitation in next 30 days
EPSS Percentile
85.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0281 is in the 79th percentile among its peer group of 23,723 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2008-1891Low

ruby: WEBrick CGI source disclosure

Apr 15, 2008

References

aluigi.altervista.org / adv/webrickcgi-adv.txt
lists.opensuse.org / opensuse-security-announce/2008-08/msg00006.html
secunia.com / advisories/29794
Vendor Advisory
secunia.com / advisories/30831
secunia.com / advisories/31687
exchange.xforce.ibmcloud.com / vulnerabilities/41824
redhat.com / archives/fedora-package-announce/2008-June/msg00937.html
mandriva.com / security/advisories
mandriva.com / security/advisories
ruby-lang.org / en/news/2008/06/20/arbitrary-code-execution-vulnerabilities
vupen.com / english/advisories/2008/1245/references