What is CVE-2021-35978?

CVE-2021-35978 is a critical-severity vulnerability in Digi Transport Dr64, classified under Command Injection. CVSS score: 9.8/10. Published 2021-12-10.

How severe is CVE-2021-35978?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Digi Transport Dr64

CVE-2021-35978

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.

Vulnerability class: Command Injection (OS Command Injection)

Published 2021-12-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.036 (88.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 88.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.036 · newest: 0.036 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-77 — Command Injection

References

digi.com (Vendor Advisory)
raw.githubusercontent.com/reidmefirst/vuln-disclosure/main/2021-04.txt (Third Party Advisory)

Frequently asked questions

What is CVE-2021-35978?: CVE-2021-35978 is a critical-severity vulnerability in Digi Transport Dr64, classified under Command Injection. CVSS score: 9.8/10. Published 2021-12-10.
How severe is CVE-2021-35978?: Critical severity. CVSS v3 base score is 9.8 out of 10.