---
cve: "CVE-2021-22212"
severity: "MEDIUM"
cvss: 4.0
epss: "52%"
vendor: "NTPsec"
kev: false
exploited: false
published: "2021-06-08 13:15:07"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-02T16:48:55+02:00"
---

# CVE-2021-22212

> 4.0 MEDIUM

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:H/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Hoch | good |
| PR Privilegien | Hoch | good |
| UI Interaktion | Erforderlich | good |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Keine | good |

## Referenzen

- <https://gitlab.com/NTPsec/ntpsec/-/issues/699>
- <https://bugzilla.redhat.com/show_bug.cgi?id=1955859>
- <https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22212.json>
- <https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3GIT2HYL5BQXPGKI6ZDNG473IEQ5WQF2/>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2021-22212) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_