CVE-2021-35978

Name: CVE-2021-35978
Creator: NVD / NIST
Published: 2021-12-10T13:15:07.62+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.56%

Last modified Jun 17, 2026

CVE-2021-35978 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered in Digi TransPort DR64, SR44 VC74, and WR. The ZING protocol allows arbitrary remote command execution with SUPER privileges. EPSS estimates a 3.56% chance of exploitation in the next 30 days.

Description

An issue was discovered in Digi TransPort DR64, SR44 VC74, and WR. The ZING protocol allows arbitrary remote command execution with SUPER privileges. This allows an attacker (with knowledge of the protocol) to execute arbitrary code on the controller including overwriting firmware, adding/removing users, disabling the internal firewall, etc.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

3.56%

87.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-77

Affected Software

Vendor	Product	Versions
Digi	Transport Dr64 Firmware	<= 5.2.4.9
Digi	Transport Sr44 Firmware	All versions
Digi	Transport Vc74 Firmware	<= 5.2.4.9
Digi	Transport Wr11 Firmware	<= 8.2.1.3
Digi	Transport Wr11 Xt Firmware	<= 8.2.1.3
Digi	Transport Wr21 Firmware	<= 8.2.1.3
Digi	Transport Wr31 Firmware	<= 8.2.1.3
Digi	Transport Wr41 Firmware	>= 5.0.0.0, <= 5.2.4.6
Digi	Transport Wr41 Firmware	>= 6.0.0.0, <= 6.1.3.5
Digi	Transport Wr41 Firmware	>= 8.0.0.0, <= 8.3.1.2
Digi	Transport Wr44 Firmware	<= 8.3.1.2

References

https://digi.comVendor Advisory
https://raw.githubusercontent.com/reidmefirst/vuln-disclosure/main/2021-04.txtThird Party Advisory
https://digi.comVendor Advisory
https://raw.githubusercontent.com/reidmefirst/vuln-disclosure/main/2021-04.txtThird Party Advisory

Timeline

Published: Dec 10, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-35978?

How severe is CVE-2021-35978?

CVE-2021-35978 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.56% probability of exploitation in the next 30 days.

How do I fix CVE-2021-35978?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-35978?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST