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CVE-2008-3905

18
FAUCET Score

CVE-2008-3905 describes a vulnerability in the resolv.rb library within Ruby versions 1.8.5 and earlier, specific 1.8.6 and 1.8.7 patches, and 1.9 r18423 and earlier. This flaw stems from the use of predictable sequential transaction IDs and constant source ports for DNS requests, making it susceptible to DNS response spoofing. With a CVSS score of 5.8, this medium-severity vulnerability allows remote attackers to potentially impact data integrity and availability with moderate attack complexity. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.8.5CPE matchmatch criteria
cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*
<= 1.8.6CPE matchmatch criteria
cpe:2.3:a:ruby-lang:ruby:*:p286:*:*:*:*:*:*
<= 1.8.7CPE matchmatch criteria
cpe:2.3:a:ruby-lang:ruby:*:p71:*:*:*:*:*:*
<= 1.9CPE matchmatch criteria
cpe:2.3:a:ruby-lang:ruby:*:r18423:*:*:*:*:*:*
1.6CPE matchmatch criteria
cpe:2.3:a:ruby-lang:ruby:1.6:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.8MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
4.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.42%
Probability of exploitation in next 30 days
EPSS Percentile
82.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0242 is in the 72nd percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 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

Patch Available

Vendor Patches (3)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 3Fixed in: ruby-0:1.6.8-13.el3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: ruby-0:1.8.1-7.el4_7.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: ruby-0:1.8.5-5.el5_2.5
View patch

Vendor Advisories (1)

redhatCVE-2008-3905Moderate

ruby: use of predictable source port and transaction id in DNS requests done by resolv.rb module

Aug 8, 2008

References

secunia.com / advisories/31430
secunia.com / advisories/32165
secunia.com / advisories/32219
secunia.com / advisories/32255
secunia.com / advisories/32256
secunia.com / advisories/32371
secunia.com / advisories/32948
secunia.com / advisories/33178
security.gentoo.org / glsa/glsa-200812-17.xml
exchange.xforce.ibmcloud.com / vulnerabilities/45935
slackware.com / security/viewer.php
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10034
support.avaya.com / elmodocs2/security/ASA-2008-424.htm
usn.ubuntu.com / 651-1
redhat.com / archives/fedora-package-announce/2008-October/msg00259.html
redhat.com / archives/fedora-package-announce/2008-October/msg00299.html
debian.org / security/2008/dsa-1651
debian.org / security/2008/dsa-1652
openwall.com / lists/oss-security/2008/09/03/3
Exploit
openwall.com / lists/oss-security/2008/09/04/9
redhat.com / support/errata/RHSA-2008-0897.html
ruby-lang.org / en/news/2008/08/08/multiple-vulnerabilities-in-ruby
Patch
securityfocus.com / bid/31699
vupen.com / english/advisories/2008/2334