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CVE-2020-12403

Critical

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.

SeverityCritical
CVSS9.1
Exploit probability—
ProductMozilla Nss
PublishedMay 27, 2021
First seenMay 27, 2021
Weakness typeCWE-125Out-of-bounds read

How to fix

Update
  • mozilla nss3.55 or later

Affected products

ProductAffected versionsFixed in
mozilla nssv < 3.553.55

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