CVE-2020-28477 | Prototype Pollution

Exp

This affects all versions of package immer.

Published: 2021-01-19 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-28477 is rated High Exploit Risk (75.3/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.29%). 2 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +2.01% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2020-28477

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2020-28477

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.29% 2.29% +2.01%
2 2026-06-01 0.22% 0.29% +0.07%
3 2026-03-11 — 0.22% —

Full EPSS history (21 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-28477

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2020-28477

GitHub Security Advisory for CVE-2020-28477

OS Trackers for CVE-2020-28477

vendor priority summary link
alpine high CVE-2020-28477: 1 source package rows (immer); 5 state rows across 4 repos (3.20-community, 3.22-community, 3.23-community, edge-community); fixed 0, open 5. https://security.alpinelinux.org/vuln/CVE-2020-28477
redhat medium — https://access.redhat.com/security/cve/CVE-2020-28477

Affected software / configurations for CVE-2020-28477

Vendor Product Version Raw CPE
immer_project immer < 8.0.1 cpe:2.3:a:immer_project:immer:*:*:*:*:*:node.js:*:*

References for CVE-2020-28477

cvelogic Threat Intelligence