VULNERABILITY INTELLIGENCE

CVE-2021-21374

CVSS score8.1 HIGH
EPSS probability1.04%
CISA KEVNot currently listed
Published2021-03-26
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:L

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 without full verification of the SSL/TLS certificate due to the default setting of httpClient. 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.

Weakness classification

  • CWE-295: Improper Certificate Validation
  • CWE-348: Use of Less Trusted Source
  • CWE-349: Acceptance of Extraneous Untrusted Data With Trusted Data
  • CWE-599: Missing Validation of OpenSSL Certificate

Primary references