CVE-2020-12403
9.1 · CRITICALOverview
CVE-2020-12403 is a critical-severity vulnerability affecting mozilla nss. 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 and patches from mozilla. Update nss to the latest patched version. 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.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| mozilla | nss | >= 0, < 3.55 | Affected |
References
Frequently Asked Questions
What is CVE-2020-12403?
CVE-2020-12403 is a critical-severity vulnerability affecting mozilla nss. 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 and patches from mozilla. Update nss to the latest patched version. 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's AI-powered security agents can automatically detect CVE-2020-12403 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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