What is CVE-2021-3805?

CVE-2021-3805 is a high-severity vulnerability in Mariocasciaro Mariocasciaro/object-Path, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 7.5/10. Published 2021-09-17.

How severe is CVE-2021-3805?

High severity. CVSS v3 base score is 7.5 out of 10.

Prototype Pollution in Mariocasciaro Mariocasciaro/object-Path

CVE-2021-3805

object-path is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Vulnerability class: Prototype Pollution

Published 2021-09-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.020 (80.8th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.020 · change: -0.001

Affected products

Mariocasciaro Mariocasciaro/object-Path — versions unspecified
Object-Path Project
Debian Linux — versions 10.0

Weakness classification (CWE)

CWE-1321 — Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)

References

huntr.dev/bounties/571e3baf-7c46-46e3-9003-ba7e4e623053 (Exploit, Patch, Third Party Advisory, Issue Tracking)
github.com/mariocasciaro/object-path/commit/e6bb638ffdd431176701b3e9024f80050d0… (Patch, Third Party Advisory)
lists.debian.org/debian-lts-announce/2023/01/msg00031.html (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2021-3805?: CVE-2021-3805 is a high-severity vulnerability in Mariocasciaro Mariocasciaro/object-Path, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 7.5/10. Published 2021-09-17.
How severe is CVE-2021-3805?: High severity. CVSS v3 base score is 7.5 out of 10.