vulnerability
Microsoft Windows: CVE-2023-50387: MITRE: CVE-2023-50387 DNSSEC verification complexity can be exploited to exhaust CPU resources and stall DNS resolvers
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 8 | (AV:N/AC:L/Au:N/C:N/I:N/A:C) | Feb 13, 2024 | Feb 13, 2024 | Sep 5, 2025 |
Severity
8
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:C)
Published
Feb 13, 2024
Added
Feb 13, 2024
Modified
Sep 5, 2025
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.
Solutions
microsoft-windows-windows_server_2012-kb5034830microsoft-windows-windows_server_2012_r2-kb5034819microsoft-windows-windows_server_2016-1607-kb5034767microsoft-windows-windows_server_2019-1809-kb5034768microsoft-windows-windows_server_2022-21h2-kb5034770microsoft-windows-windows_server_2022-22h2-kb5034770microsoft-windows-windows_server_2022-23h2-kb5034769msft-kb5034809-2fa57b92-5154-4971-9913-d857fbe00d31
References
- CVE-2023-50387
- https://attackerkb.com/topics/CVE-2023-50387
- CWE-770
- https://support.microsoft.com/help/5034767
- https://support.microsoft.com/help/5034768
- https://support.microsoft.com/help/5034769
- https://support.microsoft.com/help/5034770
- https://support.microsoft.com/help/5034819
- https://support.microsoft.com/help/5034830
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