CVE-2021-43138

7.8 HIGH 3% exploit odds Fix listed

What it is

In Async before 2.6.4 and 3.x before 3.2.2, a malicious user can obtain privileges via the mapValues() method, aka lib/internal/iterator.js createObjectIterator prototype pollution.

At a glance

Exploitability: Can be exploited locally on the machine without logging in, but needs a user to act. High risk of data exposure, data tampering, service disruption.
Exploit odds: 3.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2022-04-06 17:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 04:10 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 3.3% in the next 30 days (EPSS).
Severity: 7.8 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2022-04-06 17:15 UTC
Last modified: 2026-06-17 04:10 UTC
Exploit probability: 3.3% · EPSS, next 30 days
Weakness: CWE-1321 · Prototype pollution
Record status: Modified

Affected

Async Project Async < 2.6.4
Async Project Async < 3.2.2
Fedoraproject Fedora 36
Fedoraproject Fedora 37

Attack profile CVSS 3.1 · 7.8

Attack vector: Local
Complexity: Low
Privileges needed: None
User interaction: Required
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-43138.md and follow it. Check whether this project is affected by CVE-2021-43138. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record