CVE-2020-12403
CRITICAL9.1EPSS 0.72%Published: 5/27/2021Modified: 12/3/2025
Also known as:ALPINE-CVE-2020-12403DEBIAN-CVE-2020-12403
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.
Affected packages (2)
- Alpine/nssfrom 0, < 3.55-r0
- Debian/nssfrom 0, < 2:3.55-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |