{"cve":{"cve_id":"CVE-2020-5135","is_kev":true,"kev_date_added":"2022-03-15","kev_vendor_project":"SonicWall","kev_product":"SonicOS","kev_vulnerability_name":"SonicWall SonicOS Buffer Overflow Vulnerability","kev_short_description":"A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by sending a malicious request to the firewall.","kev_required_action":"Apply updates per vendor instructions.","kev_due_date":"2022-04-05","kev_known_ransomware":false,"kev_notes":"https://nvd.nist.gov/vuln/detail/CVE-2020-5135","kev_cwes":["CWE-120"],"epss_score":0.26869,"epss_percentile":0.97773,"epss_as_of":"2026-06-23","description":"A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by sending a malicious request to the firewall. This vulnerability affected SonicOS Gen 6 version 6.5.4.7, 6.5.1.12, 6.0.5.3, SonicOSv 6.5.4.v and Gen 7 version 7.0.0.0.","published_at":"2020-10-12T10:40:28Z","last_modified_at":null,"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":"active","ssvc_automatable":true,"ssvc_technical_impact":"total","cwes":["CWE-120"],"nvd_references":["https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2020-0010"],"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":"2026-06-24T00:09:31.350578Z","updated_at":"2026-06-28T23:14:24.437790Z"},"effective_severity":"CRITICAL","badges":["kev"],"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":"sonicwall","vendor_name":"SonicWall","product_slug":"sonicos","product_name":"SonicOS","version_start":"SonicOS 6.5.4.7-79n and earlier","version_start_inclusive":true,"version_end":"SonicOS 6.5.4.7-79n and earlier","version_end_inclusive":true,"cpe23_uri":"cve5:sonicwall:sonicos:SonicOS 6.5.4.7-79n and earlier:SonicOS 6.5.4.7-79n and earlier"},{"vendor_slug":"sonicwall","vendor_name":"SonicWall","product_slug":"sonicos","product_name":"SonicOS","version_start":"SonicOS 6.5.1.11-4n and earlier","version_start_inclusive":true,"version_end":"SonicOS 6.5.1.11-4n and earlier","version_end_inclusive":true,"cpe23_uri":"cve5:sonicwall:sonicos:SonicOS 6.5.1.11-4n and earlier:SonicOS 6.5.1.11-4n and earlier"},{"vendor_slug":"sonicwall","vendor_name":"SonicWall","product_slug":"sonicos","product_name":"SonicOS","version_start":"SonicOS 6.0.5.3-93o and earlier","version_start_inclusive":true,"version_end":"SonicOS 6.0.5.3-93o and earlier","version_end_inclusive":true,"cpe23_uri":"cve5:sonicwall:sonicos:SonicOS 6.0.5.3-93o and earlier:SonicOS 6.0.5.3-93o and earlier"},{"vendor_slug":"sonicwall","vendor_name":"SonicWall","product_slug":"sonicos","product_name":"SonicOS","version_start":"SonicOSv 6.5.4.4-44v-21-794 and earlier","version_start_inclusive":true,"version_end":"SonicOSv 6.5.4.4-44v-21-794 and earlier","version_end_inclusive":true,"cpe23_uri":"cve5:sonicwall:sonicos:SonicOSv 6.5.4.4-44v-21-794 and earlier:SonicOSv 6.5.4.4-44v-21-794 and earlier"},{"vendor_slug":"sonicwall","vendor_name":"SonicWall","product_slug":"sonicos","product_name":"SonicOS","version_start":"SonicOS 7.0.0.0-1","version_start_inclusive":true,"version_end":"SonicOS 7.0.0.0-1","version_end_inclusive":true,"cpe23_uri":"cve5:sonicwall:sonicos:SonicOS 7.0.0.0-1:SonicOS 7.0.0.0-1"}],"exploit_refs":[],"news":[],"references":[{"url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2020-0010","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2020-10-12T10:40:28Z","label":"CVE published","source":null},{"type":"cisa_reported","at":"2022-03-15T00:00:00Z","label":"Added to CISA KEV catalog","source":"kev"},{"type":"ssvc_changed","at":"2026-06-24T00:31:35.223313Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-24T00:31:35.223313Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-24T00:31:35.223313Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:35.223313Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:35.223313Z","label":"CVSS score revised","source":"vulnrichment"},{"type":"cvss_changed","at":"2026-06-24T00:31:35.223313Z","label":"CVSS score revised","source":"vulnrichment"}]}