Cyber Resilience

CVE-2020-12403

Critical

Published: 27 May 2021

Published
27 May 2021
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS Score 0.0072 72.9th percentile
Risk Priority 19 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2020-12403 is a critical-severity Out-of-bounds Read (CWE-125) vulnerability in Mozilla Nss. Its CVSS base score is 9.1 (Critical).

Operationally, ranked in the top 27.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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…

more

strictly enforcing tag length. The highest threat from this vulnerability is to confidentiality and system availability.

CWE(s)
CWE-125

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

mozilla
nss
≤ 3.55

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References