How severe is CVE-2020-28477?

CVE-2020-28477 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-28477 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-28477?

CVE-2020-28477 affects Immer Project Immer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-28477?

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

When was CVE-2020-28477 published?

CVE-2020-28477 was published on 2021-01-19 and last updated on 2026-06-17.

CVE-2020-28477

CVE-2020-28477 is a high-severity vulnerability in Immer Project Immer with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Immer Project Immer
Published: 2021-01-19
Last modified: 2026-06-17

Description

This affects all versions of package immer.

Frequently asked questions

What is CVE-2020-28477?: This affects all versions of package immer.
How severe is CVE-2020-28477?: CVE-2020-28477 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-28477 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-28477?: CVE-2020-28477 affects Immer Project Immer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-28477?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-28477 published?: CVE-2020-28477 was published on 2021-01-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:immer_project:immer:*:*:*:*:*:node.js:*:*

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CVE-2021-3757 — Critical (CVSS 9.8): immer is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
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