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CVE-2020-3924

TONNET DVR – Firmware Injection

No known exploitation. EPSS puts it in the 69th percentile. A vendor fix is available.

CVSS 3.16.4MediumEPSS percentile69th1.3% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFixVendor fixNo build named by the sources

Published Updated Sources: CVE.org, NVD

NVD CVE.org

What to do

The vendor has published a fix. Version details are below where the sources state them.

  • TONNET DVRAffected: ≤ 20191216Upgrade to: after 20191216Stated by: CVE record
  • Tonnet Tat-77104g1 FirmwareAffected: ≤ tat-77104g1_20190107Upgrade to: after tat-77104g1_20190107Stated by: NVD
  • Tonnet Tat-70432n FirmwareAffected: ≤ tat-77208g1_20181225Upgrade to: after tat-77208g1_20181225Stated by: NVD
  • Tonnet Tat-71416g1 FirmwareAffected: ≤ tat-71416g1_20181225Upgrade to: after tat-71416g1_20181225Stated by: NVD
  • Tonnet Tat-71832g1 FirmwareAffected: ≤ tat-71832g1_20190510Upgrade to: after tat-71832g1_20190510Stated by: NVD

Versions as the sources state them. 4 more products have version data. Full version matrix after sign-in

What it is

From the CVE record

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.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS69th
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

1.3% chance of exploitation activity in the next 30 days, which ranks it in the 69th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

5 events over 1729 days, from the signal feeds we watch.

  1. Patch availablerecord updated
  2. Publishedweakness classified, att&ck mapped

Affected products

And 1 more affected product. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H

Scored 6.4 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity HighRequires specific conditions like a race condition or non-default configuration
  • Privileges Required HighRequires admin or elevated privileges
  • User Interaction RequiredA user must click a link, open a file, or perform some action

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity HighTotal loss of integrity — attacker can modify any data in the component
  • Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

ATT&CK techniques

Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.

Sources

References in the record

Watch the software you run.

My Stack ranks new CVEs for your products by real-world exploitation, so the next serious one reaches you without reading every advisory.

We'll flag the next CVE, public exploit or patch for Tat-77104g1 Firmware, not every advisory.