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CVE-2020-19861

7.5 · HIGH

When a zone file in ldns 1.7.1 is parsed, the function ldns_nsec3_salt_data is too trusted for the length value obtained from the zone file.

Published Jan 21, 2022CWE-125EPSS 1.49%

Overview

CVE-2020-19861 is a high-severity vulnerability. It was published on January 21, 2022 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

When a zone file in ldns 1.7.1 is parsed, the function ldns_nsec3_salt_data is too trusted for the length value obtained from the zone file. When the memcpy is copied, the 0xfe - ldns_rdf_size(salt_rdf) byte data can be copied, causing heap overflow information leakage.

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

Refcwe.mitre.org/data/definitions/126.htmlGitHubgithub.com/NLnetLabs/ldns/issues/51Refcwe.mitre.org/data/definitions/126.htmlGitHubgithub.com/NLnetLabs/ldns/issues/51

How CyberStrike helps

Frequently asked questions

What is CVE-2020-19861?

CVE-2020-19861 is a high-severity vulnerability. It was published on January 21, 2022 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2020-19861?

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-2020-19861?

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-2020-19861?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-19861 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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