CVE-2021-21372

Name: CVE-2021-21372
Creator: NVD / NIST
Published: 2021-03-26T22:15:12.697+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 3.64%

Last modified Jun 17, 2026

CVE-2021-21372 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Nimble is a package manager for the Nim programming language. In Nim release version before versions 1.2.10 and 1.4.4, Nimble doCmd is used in different places and can be leveraged to execute arbitrary commands. EPSS estimates a 3.64% chance of exploitation in the next 30 days.

Description

Nimble is a package manager for the Nim programming language. In Nim release version before versions 1.2.10 and 1.4.4, Nimble doCmd is used in different places and can be leveraged to execute arbitrary commands. An attacker can craft a malicious entry in the packages.json package list to trigger code execution.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

3.64%

88.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nim-Lang	Nim	< 1.2.10
Nim-Lang	Nim	>= 1.4.0, < 1.4.4

References

https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/Exploit, Third Party Advisory
https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130Release Notes, Third Party Advisory
https://github.com/nim-lang/nimble/commit/7bd63d504a4157b8ed61a51af47fb086ee818c37Patch, Third Party Advisory
https://github.com/nim-lang/security/security/advisories/GHSA-rg9f-w24h-962pThird Party Advisory
https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/Exploit, Third Party Advisory
https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130Release Notes, Third Party Advisory
https://github.com/nim-lang/nimble/commit/7bd63d504a4157b8ed61a51af47fb086ee818c37Patch, Third Party Advisory
https://github.com/nim-lang/security/security/advisories/GHSA-rg9f-w24h-962pThird Party Advisory

Timeline

Published: Mar 26, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21372?

How severe is CVE-2021-21372?

CVE-2021-21372 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 3.64% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21372?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-21372?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST