CVE-2021-40663
CVE-2021-40663 is a critical-severity vulnerability in Deep.assign Project Deep.assign with a CVSS 3.x base score of 9.8. 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 9.8)
- CVSS v2: 7.5
- EPSS exploit prediction: 2% (74th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-1321
- Affected product: Deep.assign Project Deep.assign
- Published:
- Last modified:
Description
deep.assign npm package 0.0.0-alpha.0 is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').
Frequently asked questions
- What is CVE-2021-40663?
- deep.assign npm package 0.0.0-alpha.0 is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').
- How severe is CVE-2021-40663?
- CVE-2021-40663 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-40663 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-40663?
- CVE-2021-40663 affects Deep.assign Project Deep.assign. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-40663?
- 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-2021-40663 published?
- CVE-2021-40663 was published on 2022-06-30 and last updated on 2026-06-17.
References
- https://github.com/janbialostok/deep-assign/issues/1
- https://security.netapp.com/advisory/ntap-20220826-0002/
- https://www.npmjs.com/package/deep.assign
Affected products (1)
- cpe:2.3:a:deep.assign_project:deep.assign:0.0.0:alpha0:*:*:*:node.js:*:*
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