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CVE-2021-21373

7.5 · HIGH

Nimble is a package manager for the Nim programming language.

Published Mar 26, 2021CWE-348EPSS 1.16%

Overview

CVE-2021-21373 is a high-severity vulnerability. It was published on March 26, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Nimble is a package manager for the Nim programming language. In Nim release versions before versions 1.2.10 and 1.4.4, "nimble refresh" fetches a list of Nimble packages over HTTPS by default. In case of error it falls back to a non-TLS URL http://irclogs.nim-lang.org/packages.json. An attacker able to perform MitM can deliver a modified package list containing malicious software packages. If the packages are installed and used the attack escalates to untrusted code execution.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refconsensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/GitHubgithub.com/nim-lang/nimble/blob/master/changelog.markdown#0130GitHubgithub.com/nim-lang/security/security/advisories/GHSA-8w52-r35x-rgp8Refconsensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/GitHubgithub.com/nim-lang/nimble/blob/master/changelog.markdown#0130GitHubgithub.com/nim-lang/security/security/advisories/GHSA-8w52-r35x-rgp8

How CyberStrike helps

Frequently asked questions

What is CVE-2021-21373?

CVE-2021-21373 is a high-severity vulnerability. It was published on March 26, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-21373?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-21373?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-21373?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-21373 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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