Is CVE-2021-35978 actively exploited?

No active exploitation of CVE-2021-35978 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-35978 be exploited remotely?

Yes. CVE-2021-35978 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-35978?

CVE-2021-35978 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-35978

CRITICAL

CVE-2021-35978

CWE-77Published: December 10, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-35978 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Affected Vendors & Products

digi18 product(s)

transport dr64 firmwaretransport dr64transport sr44 firmwaretransport sr44transport vc74 firmwaretransport vc74transport wr11 firmwaretransport wr11transport wr11 xt firmwaretransport wr11 xttransport wr21 firmwaretransport wr21+6

Source: NVD CPE · 18 total CPE entries