USN-5168-4

    Dashboard / Vulnerabilities / USN-5168-4

    USN-5168-4

    Published: 7 Dec 2021Last Modified: 29 Jun 2026

    Summary: nss regression

    Details: USN-5168-3 fixed a vulnerability in NSS. Unfortunately that update introduced a regression that could break SSL connections. This update fixes the problem. We apologize for the inconvenience. Original advisory details: Tavis Ormandy discovered that NSS incorrectly handled verifying DSA/RSA-PSS signatures. A remote attacker could use this issue to cause NSS to crash, resulting in a denial of service, or possibly execute arbitrary code.

    References: https://ubuntu.com/security/notices/USN-5168-4, https://ubuntu.com/security/CVE-2021-43527

    Affected packages

    Package

    Name: nss

    Purl: pkg:deb/ubuntu/nss?arch=source&distro=trusty%2Fesm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2:3.28.4-0ubuntu0.14.04.5+esm10

    Affected versions

    2:3.15.1-1ubuntu1
    2:3.15.2-1
    2:3.15.3-1
    2:3.15.3.1-1
    2:3.15.3.1-1.1
    2:3.15.3.1-1.1ubuntu1
    2:3.15.4-1ubuntu3
    2:3.15.4-1ubuntu4
    2:3.15.4-1ubuntu5
    2:3.15.4-1ubuntu6
    2:3.15.4-1ubuntu7
    2:3.15.4-1ubuntu7.1

    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
    USN-5168-4 | CVE-DB