{
    "id": "CVE-2021-43527",
    "published": "2021-12-08 22:15:09",
    "last_modified": "2026-06-17 04:11:04",
    "cvss_score": "9.8",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "cwe": "CWE-787",
    "description": "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.",
    "epss_score": "0.17563",
    "epss_percentile": "0.97059",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-03 18:17:31",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "EPSS 17.6% — above the 10% action threshold."
    },
    "products": [
        {
            "vendor": "mozilla",
            "product": "nss"
        },
        {
            "vendor": "mozilla",
            "product": "nss_esr"
        },
        {
            "vendor": "netapp",
            "product": "cloud_backup"
        },
        {
            "vendor": "netapp",
            "product": "e-series_santricity_os_controller"
        },
        {
            "vendor": "oracle",
            "product": "communications_cloud_native_core_binding_support_function"
        },
        {
            "vendor": "oracle",
            "product": "communications_cloud_native_core_network_repository_function"
        },
        {
            "vendor": "oracle",
            "product": "communications_cloud_native_core_network_slice_selection_function"
        },
        {
            "vendor": "oracle",
            "product": "communications_policy_management"
        },
        {
            "vendor": "starwindsoftware",
            "product": "starwind_san_\\&_nas"
        },
        {
            "vendor": "starwindsoftware",
            "product": "starwind_virtual_san"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "https://bugzilla.mozilla.org/show_bug.cgi?id=1737470",
        "https://cert-portal.siemens.com/productcert/pdf/ssa-594438.pdf",
        "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://www.mozilla.org/security/advisories/mfsa2021-51/",
        "https://www.oracle.com/security-alerts/cpuapr2022.html",
        "https://www.starwindsoftware.com/security/sw-20220802-0001/",
        "https://bugzilla.mozilla.org/show_bug.cgi?id=1737470",
        "https://cert-portal.siemens.com/productcert/pdf/ssa-594438.pdf",
        "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://www.mozilla.org/security/advisories/mfsa2021-51/",
        "https://www.oracle.com/security-alerts/cpuapr2022.html",
        "https://www.starwindsoftware.com/security/sw-20220802-0001/"
    ]
}