Vulnerability Database

313,825

Total vulnerabilities in the database

CVE-2021-22212

ntpkeygen can generate keys that ntpd fails to parse. NTPsec 1.2.0 allows ntpkeygen to generate keys with '#' characters. ntpd then either pads, shortens the key, or fails to load these keys entirely, depending on the key type and the placement of the '#'. This results in the administrator not being able to use the keys as expected or the keys are shorter than expected and easier to brute-force, possibly resulting in MITM attacks between ntp clients and ntp servers. For short AES128 keys, ntpd generates a warning that it is padding them.

  • Published: Jun 8, 2021
  • Updated: Nov 16, 2025
  • CVE: CVE-2021-22212
  • Severity: Low
  • Exploit:

CVSS v3:

  • Severity: Low
  • Score: 4
  • AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:H/A:N

CVSS v2:

  • Severity: Medium
  • Score: 5.8
  • AV:N/AC:M/Au:N/C:P/I:P/A:N

CWEs:

OWASP TOP 10:

Software From Fixed in
ntpsec / ntpsec 1.2.0 1.2.0.x
fedoraproject / fedora 34 34.x