---
cve: "CVE-2023-50387"
severity: "HIGH"
cvss: 7.5
epss: "100%"
vendor: "n/a"
kev: false
exploited: false
published: "2024-02-14 16:15:45"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-16T16:40:52+02:00"
---

# CVE-2023-50387

> 7.5 HIGH

## Beschreibung

Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the "KeyTrap" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- c6dd1e116df75242a0c032295c152f06c721b3cd (Commit)
- a4bc1426238b28b07c0c07cd5e55478a42ed0a18 (Commit)

## Referenzen

- <https://www.athene-center.de/aktuelles/key-trap>
- <https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/>
- <https://kb.isc.org/docs/cve-2023-50387>
- <https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html>
- <https://www.theregister.com/2024/02/13/dnssec_vulnerability_internet/>
- <https://news.ycombinator.com/item?id=39367411>
- <https://www.securityweek.com/keytrap-dns-attack-could-disable-large-parts-of-internet-researchers/>
- <https://www.isc.org/blogs/2024-bind-security-release/>
- <https://news.ycombinator.com/item?id=39372384>
- <https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1>
- <https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html>
- <https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50387>
- <https://access.redhat.com/security/cve/CVE-2023-50387>
- <https://bugzilla.suse.com/show_bug.cgi?id=1219823>
- <https://www.athene-center.de/fileadmin/content/PDF/Technical_Report_KeyTrap.pdf>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2023-50387) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_