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CVE-2021-32740

25
FAUCET Score

CVE-2021-32740 describes an uncontrolled resource consumption vulnerability in Addressable, an alternative Ruby URI implementation, affecting versions 2.3.0 through 2.7.0. A maliciously crafted URI template can lead to denial of service due to catastrophic backtracking when matched against a URI. This vulnerability carries a CVSS score of 7.5 (High), indicating a network-exploitable attack with low complexity and high impact on availability. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.3.0, < 2.8.0CPE matchmatch criteria
cpe:2.3:a:addressable_project:addressable:*:*:*:*:*:ruby:*:*
33CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
34CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/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
3.1

Exploit Intelligence

EPSS Score
2.20%
Probability of exploitation in next 30 days
EPSS Percentile
80.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0220 is in the 66th percentile among its peer group of 51,506 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

Patch Available

Vendor Patches (12)

github_advisorypatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: 19024-16820Fixed in: 2.8.0-1
microsoftpatch availablevia msrc
Product: cm1 rubygem-addressable 2.8.0-1 on CBL Mariner 1.0Fixed in: 2.8.0-1
redhatpatch availablevia redhat_api
Product: OpenShift Logging 5.2Fixed in: openshift-logging/fluentd-rhel8:v5.2.0-10
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Satellite 6.10 for RHEL 7Fixed in: tfm-rubygem-addressable-0:2.8.0-1.el7sat
View patch
rubygemspatch availablevia ghsa
Product: addressableFixed in: 2.8.0
redhatno patchvia redhat_api
Product: Red Hat 3scale API Management Platform 2Fixed in: 3scale-toolbox
redhatno patchvia redhat_api
Product: Red Hat 3scale API Management Platform 2Fixed in: system
redhatend of lifevia redhat_api
Product: Red Hat 3scale API Management Platform 2Fixed in: 3scale-amp-system
redhatend of lifevia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: openshift4/ose-logging-fluentd
redhatend of lifevia redhat_api
Product: Red Hat Single Sign-On 7Fixed in: rcue-addressable
redhatend of lifevia redhat_api
Product: CloudForms Management Engine 5Fixed in: cfme-gemset

Vendor Advisories (3)

microsoft2021-Jul/CVE-2021-32740Important

Regular Expression Denial of Service in Addressable templates

Jul 13, 2021
rubygemsGHSA-jxhc-q857-3j6ghigh

Regular Expression Denial of Service in Addressable templates

Jul 12, 2021
redhatCVE-2021-32740Moderate

rubygem-addressable: ReDoS in templates

Jul 3, 2021

References

github.com / sporkmonger/addressable/commit/0d8a3127e35886ce9284810a7f2438bff6b43cbc
PatchRelease NotesThird Party Advisory
github.com / sporkmonger/addressable/security/advisories/GHSA-jxhc-q857-3j6g
Third Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/SDFQM2NHNAZ3NNUQZEJTYECYZYXV4UDS
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/WYPVOOQU7UB277UUERJMCNQLRCXRCIQ5