{"id":"CVE-2020-5735","published":"2020-04-08T13:15:13Z","modified":"2026-06-17T03:22:08Z","title":"Amcrest Cameras and NVR Stack-based Buffer Overflow Vulnerability","vendor":"Amcrest","product":"Cameras and Network Video Recorder (NVR)","tier":"core","eol":null,"description":{"text":"Amcrest cameras and NVR are vulnerable to a stack-based buffer overflow over port 37777. An authenticated remote attacker can abuse this issue to crash the device and possibly execute arbitrary code.","provenance":"source","from":"NVD"},"summary":{"text":"The Amcrest cameras and Network Video Recorder (NVR) contain a stack-based buffer overflow in the service listening on port 37777. An authenticated remote attacker can exploit it over the network without user interaction to crash the device and possibly execute arbitrary code.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:10:32Z"},"cvss":{"score":8.8,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.36217,"percentile":0.98475,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2021-11-03","dueDate":"2022-05-03","ransomware":false,"requiredAction":"Apply updates per vendor instructions.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2020-5735","provenance":"source"},"vulncheckKev":{"dateAdded":"2021-11-03","exploitedFirstSeen":"2021-11-03","ransomware":false,"evidence":[{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2021-11-03"}],"evidenceTotal":1,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-787","name":"Out-of-bounds Write"},{"id":"CWE-121","name":"Stack-based Buffer Overflow"}],"references":[{"url":"http://packetstormsecurity.com/files/157164/Amcrest-Dahua-NVR-Camera-IP2M-841-Denial-Of-Service.html","tags":["Exploit","Third Party Advisory","VDB Entry"]},{"url":"https://www.tenable.com/security/research/tra-2020-20","tags":["Third Party Advisory"]},{"url":"http://packetstormsecurity.com/files/157164/Amcrest-Dahua-NVR-Camera-IP2M-841-Denial-Of-Service.html","tags":["Exploit","Third Party Advisory","VDB Entry"]},{"url":"https://www.tenable.com/security/research/tra-2020-20","tags":["Third Party Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-5735","tags":["US Government Resource"]}],"techniques":[{"id":"T1574","name":"Hijack Execution Flow","tactics":["execution","stealth"],"provenance":"source","basis":"ctid-kev","bases":["ctid-kev"],"basisDetail":"CTID Mappings Explorer KEV 07/28/2025 (ATT&CK 16.1); capability: Buffer Overflow","mappingType":"primary_impact","evidence":[],"comment":"CVE-2020-5735 is a stack-based buffer overflow vulnerability in Amcrest cameras and NVR that allows an authenticated remote attacker to possibly execute unauthorized code over port 37777 and crash the device.","confidence":"high"},{"id":"T1499","name":"Endpoint Denial of Service","tactics":["impact"],"provenance":"source","basis":"ctid-kev","bases":["ctid-kev"],"basisDetail":"CTID Mappings Explorer KEV 07/28/2025 (ATT&CK 16.1); capability: Buffer Overflow","mappingType":"secondary_impact","evidence":[],"comment":"CVE-2020-5735 is a stack-based buffer overflow vulnerability in Amcrest cameras and NVR that allows an authenticated remote attacker to possibly execute unauthorized code over port 37777 and crash the device.","confidence":"high"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2020-26894","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-26894","exploited":true,"exploitedSince":"2021-11-03","provenance":"source"},"exploits":[{"id":48304,"url":"https://www.exploit-db.com/exploits/48304","title":"Amcrest Dahua NVR Camera IP2M-841 - Denial of Service (PoC)","type":"dos","platform":"hardware","date":"2020-04-08","verified":false,"provenance":"source"}],"exploitSources":{"exploitdb":{"count":1,"earliest":"2020-04-08"},"first":{"date":"2020-04-08","source":"Exploit-DB","url":"https://www.exploit-db.com/exploits/48304"},"provenance":"source"},"exploitRefs":["http://packetstormsecurity.com/files/157164/Amcrest-Dahua-NVR-Camera-IP2M-841-Denial-Of-Service.html"],"flow":[{"stage":"primary","techniques":["T1574"],"provenance":"source"},{"stage":"secondary","techniques":["T1499"],"provenance":"source"}],"timeline":[{"date":"2020-04-08","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5735","provenance":"source"},{"date":"2020-04-08","kind":"exploit-public","label":"First public exploit: Exploit-DB (EDB-48304)","url":"https://www.exploit-db.com/exploits/48304","provenance":"source"},{"date":"2021-11-03","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","provenance":"source"},{"date":"2021-11-03","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2021-11-03","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-26894","provenance":"source"}],"speed":{"daysToPublicExploit":0,"firstExploitFrom":"Exploit-DB","daysToKev":574},"priority":{"score":68.9,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 1821 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.7,"detail":"percentile 0.9848"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 NVD reference tagged Exploit; 1 Exploit-DB entry"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":6.16,"detail":"base score 8.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}