vulnerability
Arch Linux: Man-in-the-middle (CVE-2021-21373)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 4 | (AV:N/AC:M/Au:N/C:N/I:P/A:N) | Mar 26, 2021 | Jul 11, 2025 | Nov 27, 2025 |
Severity
4
CVSS
(AV:N/AC:M/Au:N/C:N/I:P/A:N)
Published
Mar 26, 2021
Added
Jul 11, 2025
Modified
Nov 27, 2025
Description
In Nimble before version 0.13.0, "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.
Solution
arch-linux-upgrade-latest
References
- CVE-2021-21373
- https://attackerkb.com/topics/CVE-2021-21373
- URL-https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/
- URL-https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130
- URL-https://github.com/nim-lang/security/security/advisories/GHSA-8w52-r35x-rgp8
- URL-https://security.archlinux.org/ASA-202104-6
- CWE-348
- CWE-295
NEW
Explore Exposure Command
Confidently identify and prioritize exposures from endpoint to cloud with full attack surface visibility and threat-aware risk context.