How severe is CVE-2021-42581?

CVE-2021-42581 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2021-42581 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42581?

CVE-2021-42581 affects Ramdajs Ramda. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42581?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-42581 published?

CVE-2021-42581 was published on 2022-05-10 and last updated on 2026-06-17.

CVE-2021-42581

CVE-2021-42581 is a critical-severity vulnerability in Ramdajs Ramda with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1321.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.4
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1321
Affected product: Ramdajs Ramda
Published: 2022-05-10
Last modified: 2026-06-17

Description

Prototype poisoning in function mapObjIndexed in Ramda 0.27.0 and earlier allows attackers to compromise integrity or availability of application via supplying a crafted object (that contains an own property "__proto__") as an argument to the function. NOTE: the vendor disputes this because the observed behavior only means that a user can create objects that the user didn't know would contain custom prototypes

Frequently asked questions

What is CVE-2021-42581?: Prototype poisoning in function mapObjIndexed in Ramda 0.27.0 and earlier allows attackers to compromise integrity or availability of application via supplying a crafted object (that contains an own property "__proto__") as an argument to the function. NOTE: the vendor disputes this because the observed behavior only means that a user can create objects that the user didn't know would contain custom prototypes
How severe is CVE-2021-42581?: CVE-2021-42581 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2021-42581 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42581?: CVE-2021-42581 affects Ramdajs Ramda. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42581?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-42581 published?: CVE-2021-42581 was published on 2022-05-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ramdajs:ramda:*:*:*:*:*:*:*:*

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