CVSS 3.1
9.1 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:HCVE-2020-12403
Critical (9.1) in mozilla nss. EPSS 1.5% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 1.5% chance of exploitation in the next 30 days; higher than 74% of CVEs (scores of 2026-10-31)
- CWE
- CWE-125
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mozilla:nss
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1868931
- https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.55_release_notes
- https://lists.debian.org/debian-lts-announce/2023/02/msg00021.html
- https://security.netapp.com/advisory/ntap-20230324-0006/
- https://bugzilla.redhat.com/show_bug.cgi?id=1868931