VULNERABILITY INTELLIGENCE
CVE-2020-12403
CVSS score9.1 CRITICAL
EPSS probability1.54%
CISA KEVNot currently listed
Published2021-05-27
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
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.
Weakness classification
- security@mozilla.org: CWE-125
- nvd@nist.gov: CWE-125
Primary references
- security@mozilla.org — Issue Tracking, Patch, Third Party Advisory
- security@mozilla.org — Release Notes, Vendor Advisory
- security@mozilla.org
- security@mozilla.org
- af854a3a-2127-422b-91ae-364da2661108 — Issue Tracking, Patch, Third Party Advisory
- af854a3a-2127-422b-91ae-364da2661108 — Release Notes, Vendor Advisory
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108