{"cve":"CVE-2021-43527","nvd":{"published":"2021-12-08T22:15:09.163","modified":"2026-06-17T04:11:04.203","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-787"],"references":["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"],"products":["mozilla:nss","mozilla:nss_esr","netapp:cloud_backup","netapp:e-series_santricity_os_controller","oracle:communications_cloud_native_core_binding_support_function","oracle:communications_cloud_native_core_network_repository_function","oracle:communications_cloud_native_core_network_slice_selection_function","oracle:communications_policy_management","starwindsoftware:starwind_san_\\&_nas","starwindsoftware:starwind_virtual_san"],"source":"nvd","synced_at":"2026-10-19T21:25:41.256909649+00:00"},"epss":{"cve":"CVE-2021-43527","score":0.17563,"percentile":0.9714,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}