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CVE-2020-12403

9.1 · CRITICAL

A flaw was found in the way CHACHA20-POLY1305 was implemented in NSS in versions before 3.55.

Published May 27, 2021CWE-125EPSS 1.54%

Overview

CVE-2020-12403 is a critical-severity vulnerability. It was published on May 27, 2021 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A flaw was found in the way CHACHA20-POLY1305 was implemented in NSS in versions before 3.55. When using multi-part Chacha20, it could cause out-of-bounds reads. This issue was fixed by explicitly disabling multi-part ChaCha20 (which was not functioning correctly) and strictly enforcing tag length. The highest threat from this vulnerability is to confidentiality and 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=1868931Refdeveloper.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.55_release_notesReflists.debian.org/debian-lts-announce/2023/02/msg00021.htmlRefsecurity.netapp.com/advisory/ntap-20230324-0006/Refbugzilla.redhat.com/show_bug.cgi?id=1868931Refdeveloper.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.55_release_notesReflists.debian.org/debian-lts-announce/2023/02/msg00021.htmlRefsecurity.netapp.com/advisory/ntap-20230324-0006/

How CyberStrike helps

Frequently asked questions

What is CVE-2020-12403?

CVE-2020-12403 is a critical-severity vulnerability. It was published on May 27, 2021 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2020-12403?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2020-12403?

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-2020-12403?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-12403 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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