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CVE-2021-42581

28
FAUCET Score

CVE-2021-42581 describes a prototype poisoning vulnerability in Ramda 0.27.0 and earlier, specifically within the mapObjIndexed function, which affects the ramdajs ramda library. This critical vulnerability (CVSS 9.1) allows attackers to compromise application integrity or availability by providing a specially crafted object containing a "__proto__" property as an argument, though the vendor disputes the severity. Despite its high severity, there is no known active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.27.0CPE matchmatch criteria
cpe:2.3:a:ramdajs:ramda:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.1CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.36%
Probability of exploitation in next 30 days
EPSS Percentile
68.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0136 is in the 56th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (8)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Ceph Storage 6.1Fixed in: rhceph/rhceph-6-dashboard-rhel9:6-75
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat Process Automation 7Fixed in: ramda
redhatvendor investigatingvia redhat_api
Product: Red Hat Decision Manager 7Fixed in: ramda
redhatno patchvia redhat_api
Product: Red Hat Ceph Storage 5Fixed in: rhceph/rhceph-5-dashboard-rhel8
redhatend of lifevia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: rhacm2/application-ui-rhel8
redhatend of lifevia redhat_api
Product: OpenShift Service Mesh 2.1Fixed in: openshift-service-mesh/kiali-rhel8
redhatend of lifevia redhat_api
Product: OpenShift Service Mesh 2.1Fixed in: servicemesh-grafana

Vendor Advisories (1)

redhatCVE-2021-42581Moderate

ramda: prototype poisoning

May 10, 2022

References

github.com / ramda/ramda/pull/3192
Issue TrackingPatchThird Party Advisory
jsfiddle.net / 3pomzw5g/2
ExploitThird Party Advisory