CVE-2021-4105Network attack vector

Unauthenticated code execution via improper parameter handling

Published Feb 24, 2023 · Updated May 18, 2026

Remote code inclusion in BG-TEK COSLAT Firewall before 5.24.0.R.20210727 allows remote attackers to execute arbitrary code. The vendor and CNA identify improper parameter handling but do not disclose the affected request, parameter, or code path. The flaw is remotely reachable without authentication or user interaction and grants control over appliance data and operation.

CVSS severity9.8
Critical
EPSS probability0.87%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code inclusion in BG-TEK COSLAT Firewall before 5.24.0.R.20210727 allows remote attackers to execute arbitrary code. The vendor and CNA identify improper parameter handling but do not disclose the affected request, parameter, or code path. The flaw is remotely reachable without authentication or user interaction and grants control over appliance data and operation.

The record

CVE
CVE-2021-4105
Published
Feb 24, 2023
Updated
May 18, 2026
Vendor
BG-TEK
Product
COSLAT Firewall
Classifications
CWE-755, CAPEC-253, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 24, 2023CVE publishedPublication date reported by the CVE source.
  2. May 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.24.0.r.20180630 <5.24.0.r.20210727

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

BG-TEK · COSLAT Firewallversion=5.24.0.r.20180630 <5.24.0.r.20210727

Published CVSS scores

9.8TR-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-755Improper Handling of Exceptional Conditions
CAPEC-253Remote Code Inclusion
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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