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CVE-2023-50387

7.5 · HIGH

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,…

Published Feb 14, 2024CWE-770EPSS 99.99%

Overview

CVE-2023-50387 is a high-severity vulnerability. It was published on February 14, 2024 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.openwall.com/lists/oss-security/2024/02/16/2Refwww.openwall.com/lists/oss-security/2024/02/16/3Refaccess.redhat.com/security/cve/CVE-2023-50387Refbugzilla.suse.com/show_bug.cgi?id=1219823Refdocs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.htmlRefgitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1Refkb.isc.org/docs/cve-2023-50387Reflists.debian.org/debian-lts-announce/2024/02/msg00006.htmlReflists.debian.org/debian-lts-announce/2024/05/msg00011.htmlReflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/

How CyberStrike helps

Frequently asked questions

What is CVE-2023-50387?

CVE-2023-50387 is a high-severity vulnerability. It was published on February 14, 2024 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2023-50387?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-50387?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-50387?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-50387 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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