CVE-2021-43527

    Dashboard / Vulnerabilities / CVE-2021-43527

    CVE-2021-43527

    Published: 8 Dec 2021Last Modified: 16 Apr 2026

    Summary:

    Details: NSS (Network Security Services) versions prior to 3.73 or 3.68.1 ESR are vulnerable to a heap overflow when handling DER-encoded DSA or RSA-PSS signatures. Applications using NSS for handling signatures encoded within CMS, S/MIME, PKCS \#7, or PKCS \#12 are likely to be impacted. Applications using NSS for certificate validation or other TLS, X.509, OCSP or CRL functionality may be impacted, depending on how they configure NSS. *Note: This vulnerability does NOT impact Mozilla Firefox.* However, email clients and PDF viewers that use NSS for signature verification, such as Thunderbird, LibreOffice, Evolution and Evince are believed to be impacted. This vulnerability affects NSS < 3.73 and NSS < 3.68.1.

    References: https://ftp.mozilla.org/pub/security/nss/releases/NSS_3_68_1_RTM/, https://ftp.mozilla.org/pub/security/nss/releases/NSS_3_73_RTM/, https://security.gentoo.org/glsa/202212-05, https://security.netapp.com/advisory/ntap-20211229-0002/, https://cert-portal.siemens.com/productcert/pdf/ssa-594438.pdf, https://www.mozilla.org/security/advisories/mfsa2021-51/, https://www.starwindsoftware.com/security/sw-20220802-0001/, https://bugzilla.mozilla.org/show_bug.cgi?id=1737470, https://www.oracle.com/security-alerts/cpuapr2022.html

    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-2021-43527 | CVE-DB