Is CVE-2021-36767 actively exploited?

No active exploitation of CVE-2021-36767 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-36767 be exploited remotely?

Yes. CVE-2021-36767 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-36767?

CVE-2021-36767 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-36767

CRITICAL

CVE-2021-36767

CWE-916Published: October 8, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

In Digi RealPort through 4.10.490, authentication relies on a challenge-response mechanism that gives access to the server password, making the protection ineffective. An attacker may send an unauthenticated request to the server. The server will reply with a weakly-hashed version of the server's access password. The attacker may then crack this hash offline in order to successfully login to the server.

NVD Source

Technical Analysis

CVE-2021-36767 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

digi37 product(s)

realportconnectport ts 8\/16 firmwareconnectport ts 8\/16connectport lts 8\/16\/32 firmwareconnectport lts 8\/16\/32passport integrated console server firmwarepassport integrated console servercm firmwarecmportserver ts firmwareportserver tsportserver ts mei firmware+25

Source: NVD CPE · 37 total CPE entries