{"cve":{"cve_id":"CVE-2026-20353","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":0.00373,"epss_percentile":0.30856,"epss_as_of":"2026-09-15","description":"As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Email Gateway and Cisco Secure Email and Web Manager engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.\r\n\r\nThe vulnerabilities tracked by CVE-2026-20353 are related to issues with improper control of a resource through its lifetime that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-664.","published_at":"2026-09-14T16:08:50.062000Z","last_modified_at":"2026-09-15T18:17:19.887000Z","cvss_v3_score":9.8,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_v3_severity":"CRITICAL","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":["CWE-664"],"nvd_references":["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-esa-dfCrfXkm"],"vuln_status":"Awaiting Analysis","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":"2026-09-14T18:01:07.990582Z","updated_at":"2026-09-16T00:09:06.500756Z"},"effective_severity":"CRITICAL","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"14.0.0-698","version_start_inclusive":true,"version_end":"14.0.0-698","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:14.0.0-698:14.0.0-698"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"13.5.1-277","version_start_inclusive":true,"version_end":"13.5.1-277","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:13.5.1-277:13.5.1-277"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"13.0.0-392","version_start_inclusive":true,"version_end":"13.0.0-392","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:13.0.0-392:13.0.0-392"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"14.2.0-620","version_start_inclusive":true,"version_end":"14.2.0-620","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:14.2.0-620:14.2.0-620"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"13.0.5-007","version_start_inclusive":true,"version_end":"13.0.5-007","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:13.0.5-007:13.0.5-007"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"13.5.4-038","version_start_inclusive":true,"version_end":"13.5.4-038","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:13.5.4-038:13.5.4-038"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"14.2.1-020","version_start_inclusive":true,"version_end":"14.2.1-020","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:14.2.1-020:14.2.1-020"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"14.3.0-032","version_start_inclusive":true,"version_end":"14.3.0-032","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:14.3.0-032:14.3.0-032"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"15.0.0-104","version_start_inclusive":true,"version_end":"15.0.0-104","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:15.0.0-104:15.0.0-104"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"15.0.1-030","version_start_inclusive":true,"version_end":"15.0.1-030","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:15.0.1-030:15.0.1-030"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"15.5.0-048","version_start_inclusive":true,"version_end":"15.5.0-048","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:15.5.0-048:15.5.0-048"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"15.5.1-055","version_start_inclusive":true,"version_end":"15.5.1-055","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:15.5.1-055:15.5.1-055"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"15.5.2-018","version_start_inclusive":true,"version_end":"15.5.2-018","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:15.5.2-018:15.5.2-018"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"16.0.0-050","version_start_inclusive":true,"version_end":"16.0.0-050","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:16.0.0-050:16.0.0-050"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"15.0.3-002","version_start_inclusive":true,"version_end":"15.0.3-002","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:15.0.3-002:15.0.3-002"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"16.0.0-054","version_start_inclusive":true,"version_end":"16.0.0-054","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:16.0.0-054:16.0.0-054"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"15.5.3-022","version_start_inclusive":true,"version_end":"15.5.3-022","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:15.5.3-022:15.5.3-022"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"16.0.1-017","version_start_inclusive":true,"version_end":"16.0.1-017","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:16.0.1-017:16.0.1-017"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"15.5.4-012","version_start_inclusive":true,"version_end":"15.5.4-012","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:15.5.4-012:15.5.4-012"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"16.0.4-016","version_start_inclusive":true,"version_end":"16.0.4-016","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:16.0.4-016:16.0.4-016"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"15.0.5-016","version_start_inclusive":true,"version_end":"15.0.5-016","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:15.0.5-016:15.0.5-016"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"16.0.2-112","version_start_inclusive":true,"version_end":"16.0.2-112","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:16.0.2-112:16.0.2-112"},{"vendor_slug":"cisco","vendor_name":"Cisco","product_slug":"cisco-secure-email","product_name":"Cisco Secure Email","version_start":"16.0.3-044","version_start_inclusive":true,"version_end":"16.0.3-044","version_end_inclusive":true,"cpe23_uri":"cve5:cisco:cisco-secure-email:16.0.3-044:16.0.3-044"}],"exploit_refs":[],"news":[],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-esa-dfCrfXkm","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2026-09-14T16:08:50.062000Z","label":"CVE published","source":null}]}