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CVE-2017-6181

26
FAUCET Score

CVE-2017-6181 describes a denial-of-service vulnerability in the Onigmo regular expression library, specifically affecting Ruby 2.4.0. A remote attacker can trigger deep recursion and an application crash by providing a specially crafted regular expression. Rated 7.5 HIGH, this vulnerability has a low attack complexity and requires no user interaction, leading to a high impact on availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
2.4.0CPE matchmatch criteria
cpe:2.3:a:ruby-lang:ruby:2.4.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.65%
Probability of exploitation in next 30 days
EPSS Percentile
88.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0365 is in the 79th percentile among its peer group of 51,551 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

redhatend of lifevia redhat_api
Product: Red Hat Software CollectionsFixed in: rh-ruby24-ruby

Vendor Advisories (1)

redhatCVE-2017-6181Moderate

ruby: Stack overflow in parse_char_class() in Onigmo

Feb 20, 2017

References

bugs.ruby-lang.org / issues/13234
Issue TrackingVendor Advisory
bugs.ruby-lang.org / projects/ruby-trunk/repository/revisions/57660
Issue TrackingVendor Advisory
securityfocus.com / bid/97304
Third Party AdvisoryVDB Entry