What’s Vulnerable › Vulnerabilities

CVE-2020-3924: TONNET DVR – Firmware Injection

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-02-27 · updated 2026-06-17
• Weakness: CWE-77

Description

DVR firmware in TAT-76 and TAT-77 series of products, provided by TONNET do not properly verify patch files. Attackers can inject a specific command into a patch file and gain access to the system.

Affected products

• TONNET Tat-70432N Firmware: through tat-77208g1_20181225
• TONNET Tat-71416G1 Firmware: through tat-71416g1_20181225
• TONNET Tat-71832G1 Firmware: through tat-71832g1_20190510
• TONNET Tat-76104G3 Firmware: through 20181220_76104g3
• TONNET Tat-76108G3 Firmware: through 20181221_76208g3
• TONNET Tat-76116G3 Firmware: through 20181221_76216g3
• TONNET Tat-76132G3 Firmware: through tat-70832g3_20181221-1
• TONNET Tat-77104G1 Firmware: through tat-77104g1_20190107

References

• https://tvn.twcert.org.tw/taiwanvn/TVN-201910004
• https://www.chtsecurity.com/news/4ef5eb3a-fdc3-4d78-8dd7-ec7213e2bbcf
• https://tvn.twcert.org.tw/taiwanvn/TVN-201910004
• https://www.chtsecurity.com/news/4ef5eb3a-fdc3-4d78-8dd7-ec7213e2bbcf

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