Is CVE-2021-4105 actively exploited?

No active exploitation of CVE-2021-4105 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-4105 be exploited remotely?

Yes. CVE-2021-4105 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-4105?

CVE-2021-4105 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2021-4105

CWE-755Published: February 24, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Improper Handling of Parameters vulnerability in BG-TEK COSLAT Firewall allows Remote Code Inclusion.

This issue affects COSLAT Firewall: from 5.24.0.R.20180630 before 5.24.0.R.20210727.

NVD Source

Technical Analysis

CVE-2021-4105 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

bg-tek16 product(s)

coslat bx5s1d3 firmwarecoslat bx5s1d3coslat bx5s1d4 firmwarecoslat bx5s1d4coslat bx5s1d5 firmwarecoslat bx5s1d5coslat rm1ds1000 firmwarecoslat rm1ds1000coslat rm2ds2000 firmwarecoslat rm2ds2000coslat rm2s200 firmwarecoslat rm2s200+4

Source: NVD CPE · 16 total CPE entries