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CVE-2020-25681

8.1 · HIGH

A flaw was found in dnsmasq before version 2.83.

Published Jan 20, 2021CWE-122EPSS 81.19%

Overview

CVE-2020-25681 is a high-severity vulnerability. It was published on January 20, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in the way RRSets are sorted before validating with DNSSEC data. An attacker on the network, who can forge DNS replies such as that they are accepted as valid, could use this flaw to cause a buffer overflow with arbitrary data in a heap memory segment, possibly executing code on the machine. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

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

Refbugzilla.redhat.com/show_bug.cgi?id=1881875Reflists.debian.org/debian-lts-announce/2021/03/msg00027.htmlReflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/Refsecurity.gentoo.org/glsa/202101-17Refwww.debian.org/security/2021/dsa-4844Refwww.jsof-tech.com/disclosures/dnspooq/Refbugzilla.redhat.com/show_bug.cgi?id=1881875Reflists.debian.org/debian-lts-announce/2021/03/msg00027.htmlReflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/

How CyberStrike helps

Frequently asked questions

What is CVE-2020-25681?

CVE-2020-25681 is a high-severity vulnerability. It was published on January 20, 2021 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2020-25681?

This vulnerability has a CVSS 3.1 base score of 8.1, 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-2020-25681?

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-2020-25681?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-25681 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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