🛡️ CVE-2023-50387
🟠 CVSS 7.5 — High ✅ No Known Exploit CWE-770 NVD
7.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Details

Severity HIGH
CVSS Score 7.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-770
Public Exploit ✅ No
Source NVD
Published 2024-02-14
Updated 2026-06-08
Modified 2025-11-04

Affected Packages

Software From version Fixed in
bind 9.19.0 9.19.20
dnsmasq — 2.90
enterprise-linux — —
fedora — —
knot-resolver — 5.71
recursor 5.0.0 5.0.2
unbound — 1.19.1
windows-server-2008 — —
windows-server-2012 — —
windows-server-2016 — —
windows-server-2019 — —
windows-server-2022 — —
windows-server-2022-23h2 — —

References

Third Party Advisory, VDB Entry https://kb.isc.org/docs/cve-2023-50387
Third Party Advisory, VDB Entry https://kb.isc.org/docs/cve-2023-50387

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