CVE-2020-12403
CRITICAL
9.1
CVSS Score
Published: May 27, 2021 at 12:00 AM UTC
Updated: June 17, 2026 at 02:51 AM UTC
1 product affected across 1 vendorNSS
Using nss by N/A?
Get instant alerts when new vulnerabilities affect nss - before attackers find them.
Real-time alertsTrack your software stackFree plan available
Severity
CRITICAL9.1
Exploit prediction
EPSS 2%
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.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (4)
Issue TrackingPatchThird Party Advisory
Source: [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=1868931Release NotesVendor Advisory
Source: [email protected]
https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.55_release_notesCVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-125
Get alerted
Stop reading CVE feeds looking for your own stack
Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.
Free plan, no card