What is CVE-2020-8147?

CVE-2020-8147 is a critical-severity vulnerability in Utils-Extend Project, classified under Modification of Assumed-Immutable Data (MAID). CVSS score: 9.8/10. Published 2020-04-03.

How severe is CVE-2020-8147?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2020-8147 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in Utils-Extend Project

CVE-2020-8147

Flaw in input validation in npm package utils-extend version 1.0.8 and earlier may allow prototype pollution attack that may result in remote code execution or denial of service of applications using utils-extend.

Published 2020-04-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.031 (87.7th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 87.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.031 · newest: 0.031 · change: 0.000

Affected products

Utils-Extend Project
Utils-Extend — versions version 1.0.8 and earlier, Not Fixed

Weakness classification (CWE)

Public proof-of-concept exploits

References

hackerone.com/reports/801522 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-8147?: CVE-2020-8147 is a critical-severity vulnerability in Utils-Extend Project, classified under Modification of Assumed-Immutable Data (MAID). CVSS score: 9.8/10. Published 2020-04-03.
How severe is CVE-2020-8147?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2020-8147 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.