CVE-2020-12403

    Dashboard / Vulnerabilities / CVE-2020-12403

    CVE-2020-12403

    Published: 27 May 2021Last Modified: 16 Apr 2026

    Summary:

    Details: 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.

    References: https://lists.debian.org/debian-lts-announce/2023/02/msg00021.html, https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.55_release_notes, https://security.netapp.com/advisory/ntap-20230324-0006/, https://bugzilla.redhat.com/show_bug.cgi?id=1868931

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2020-12403 | CVE-DB