{"cve":{"cve_id":"CVE-2021-43527","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.17563,"epss_percentile":0.96745,"epss_as_of":"2026-06-23","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.","published_at":"2021-12-08T00:00:00Z","last_modified_at":null,"cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":null,"nvd_references":["https://www.mozilla.org/security/advisories/mfsa2021-51/","https://bugzilla.mozilla.org/show_bug.cgi?id=1737470","https://ftp.mozilla.org/pub/security/nss/releases/NSS_3_73_RTM/","https://ftp.mozilla.org/pub/security/nss/releases/NSS_3_68_1_RTM/","https://www.oracle.com/security-alerts/cpuapr2022.html","https://security.netapp.com/advisory/ntap-20211229-0002/","https://cert-portal.siemens.com/productcert/pdf/ssa-594438.pdf","https://www.starwindsoftware.com/security/sw-20220802-0001/","https://security.gentoo.org/glsa/202212-05"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:16:21.280568Z"},"effective_severity":null,"badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"mozilla","vendor_name":"Mozilla","product_slug":"nss","product_name":"NSS","version_start":"unspecified","version_start_inclusive":true,"version_end":"3.73","version_end_inclusive":false,"cpe23_uri":"cve5:mozilla:nss:unspecified:3.73"},{"vendor_slug":"mozilla","vendor_name":"Mozilla","product_slug":"nss","product_name":"NSS","version_start":"unspecified","version_start_inclusive":true,"version_end":"3.68.1","version_end_inclusive":false,"cpe23_uri":"cve5:mozilla:nss:unspecified:3.68.1"}],"exploit_refs":[],"news":[],"references":[{"url":"https://www.mozilla.org/security/advisories/mfsa2021-51/","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1737470","source_type":"MISC","tags":[]},{"url":"https://ftp.mozilla.org/pub/security/nss/releases/NSS_3_73_RTM/","source_type":"MISC","tags":[]},{"url":"https://ftp.mozilla.org/pub/security/nss/releases/NSS_3_68_1_RTM/","source_type":"MISC","tags":[]},{"url":"https://www.oracle.com/security-alerts/cpuapr2022.html","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20211229-0002/","source_type":"MISC","tags":[]},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-594438.pdf","source_type":"MISC","tags":[]},{"url":"https://www.starwindsoftware.com/security/sw-20220802-0001/","source_type":"MISC","tags":[]},{"url":"https://security.gentoo.org/glsa/202212-05","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2021-12-08T00:00:00Z","label":"CVE published","source":null}]}