CVSS 3.1
8.1 highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HCVE-2021-21374
High (8.1) in nim-lang nim. EPSS 1.0% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 1.0% chance of exploitation in the next 30 days; higher than 64% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-295, CWE-348, CWE-349, CWE-599
- Published
- Modified
- Record from
- the NVD, synced
Affected
- nim-lang:nim
References
- https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/
- https://github.com/nim-lang/Nim/pull/16940
- https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130
- https://github.com/nim-lang/security/security/advisories/GHSA-c2wm-v66h-xhxx
- https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/