CVE-2020-12403
9.1
CRITICAL
CVSS 3.1
EPSS 0.72%
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.
How to fix CVE-2020-12403
To remediate CVE-2020-12403, upgrade the affected package to a fixed version below.
- —upgrade to 3.55-r0 or later
- —upgrade to 2:3.55-1 or later
Is CVE-2020-12403 being exploited?
Low — EPSS is 0.7%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 3.55-r0
- from 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 |