{"id":"CVE-2020-5135","url":"https://www.cyber-defence.io/tools/cve/CVE-2020-5135","generatedAt":"2026-10-27T22:25:33.942Z","title":"SonicWall SonicOS Buffer Overflow Vulnerability","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":"2020-10-12T11:15:13.000Z","lastModified":"2026-06-17T03:20:57.000Z","status":"Analyzed","sourceIdentifier":"PSIRT@sonicwall.com","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-120"],"affected":["sonicwall/sonicos","sonicwall/sonicosv"],"epss":{"score":0.26869,"percentile":0.98022,"date":"2026-10-26","history":[]},"kev":{"listed":true,"dateAdded":"2022-03-15","dueDate":"2022-04-05","knownRansomwareCampaignUse":"Known","notes":"Apply updates per vendor instructions.\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-5135"},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"Known to be exploited in the wild (CISA KEV, CISA remediation deadline 5 April 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise."},"changes":[],"references":[{"url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2020-0010","tags":["Vendor Advisory"],"source":"PSIRT@sonicwall.com"},{"url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2020-0010","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-5135","tags":["US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-5135","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}