CVE-2020-3923 json
TONNET DVR – Broken Access Control
published 2020-02-27 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-25188
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.7%
- EPSS 1.7% chance of exploitation in 30 days, percentile 77%
- public exploits
- 0
- none known
Summary
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.
Exploit prediction
1.68% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 10.0 | AV:N/AC:L/Au:N/C:C/I:C/A:C |
Affected products
- TONNET DVR
Classification
- Weakness
-
- CWE-287 Improper Authentication
References
-
tvn.twcert.org.tw
/taiwanvn/TVN-201910003
third-party-advisory
-
chtsecurity.com
/news/4ef5eb3a-fdc3-4d78-8dd7-ec7213e2bbcf
third-party-advisory
Sources
- CVE List CVE-2020-3923
- NVD CVE-2020-3923
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.