Critical severity · published May 27, 2021
CVE-2020-12403
A flaw was found in the way CHACHA20-POLY1305 was implemented in NSS in versions before 3.55
9.1
CVSS
1.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.5% · higher than 75% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NS
Nss · Mozilla
before 3.55 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-12403
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-12403
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=1868931
Release Notes
https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.55_release_notes
lists.debian.org
https://lists.debian.org/debian-lts-announce/2023/02/msg00021.html
security.netapp.com
https://security.netapp.com/advisory/ntap-20230324-0006/
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