{"id":"CVE-2020-3923","url":"https://www.cyber-defence.io/tools/cve/CVE-2020-3923","generatedAt":"2026-10-27T23:28:53.395Z","title":"Attackers can crack the default password and gain access to the system.","description":"DVR firmware in TAT-76 and TAT-77 series of products, provided by TONNET, contain misconfigured authentication mechanism. Attackers can crack the default password and gain access to the system.","published":"2020-02-27T04:15:11.000Z","lastModified":"2026-06-17T03:19:16.000Z","status":"Modified","sourceIdentifier":"twcert@cert.org.tw","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-287"],"affected":["tonnet/tat-77104g1 firmware","tonnet/tat-70432n firmware","tonnet/tat-71416g1 firmware","tonnet/tat-71832g1 firmware","tonnet/tat-76104g3 firmware","tonnet/tat-76108g3 firmware","tonnet/tat-76116g3 firmware","tonnet/tat-76132g3 firmware"],"epss":{"score":0.01679,"percentile":0.76757,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (1.68%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://tvn.twcert.org.tw/taiwanvn/TVN-201910003","tags":["Third Party Advisory"],"source":"twcert@cert.org.tw"},{"url":"https://www.chtsecurity.com/news/4ef5eb3a-fdc3-4d78-8dd7-ec7213e2bbcf","tags":["Third Party Advisory"],"source":"twcert@cert.org.tw"},{"url":"https://tvn.twcert.org.tw/taiwanvn/TVN-201910003","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.chtsecurity.com/news/4ef5eb3a-fdc3-4d78-8dd7-ec7213e2bbcf","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-3923","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."}