CVE-2021-4105

Name: CVE-2021-4105
Creator: NVD / NIST
Published: 2023-02-24T12:15:30.127+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.86%

Last modified Jun 17, 2026

CVE-2021-4105 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 0.86% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

0.86%

54.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-755

Affected Software

Vendor	Product	Versions
Bg-Tek	Coslat Bx5s1d3 Firmware	>= 5.24.0.r.20180630, < 5.24.0.r.20210727
Bg-Tek	Coslat Bx5s1d4 Firmware	>= 5.24.0.r.20180630, < 5.24.0.r.20210727
Bg-Tek	Coslat Bx5s1d5 Firmware	>= 5.24.0.r.20180630, < 5.24.0.r.20210727
Bg-Tek	Coslat Rm1ds1000 Firmware	>= 5.24.0.r.20180630, < 5.24.0.r.20210727
Bg-Tek	Coslat Rm2ds2000 Firmware	>= 5.24.0.r.20180630, < 5.24.0.r.20210727
Bg-Tek	Coslat Rm2s200 Firmware	>= 5.24.0.r.20180630, < 5.24.0.r.20210727
Bg-Tek	Coslat Rm3s300 Firmware	>= 5.24.0.r.20180630, < 5.24.0.r.20210727
Bg-Tek	Coslat Rm4s500 Firmware	>= 5.24.0.r.20180630, < 5.24.0.r.20210727

References

http://blog.coslat.com/2021/07/onemli-kritik-guncelleme-2021-07-27.htmlVendor Advisory
https://siberguvenlik.gov.tr/guvenlik-bildirimleri/detay/tr-23-0108
https://www.usom.gov.tr/bildirim/tr-23-0108Third Party Advisory
http://blog.coslat.com/2021/07/onemli-kritik-guncelleme-2021-07-27.htmlVendor Advisory
https://www.usom.gov.tr/bildirim/tr-23-0108Third Party Advisory

Timeline

Published: Feb 24, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4105?

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.

How severe is CVE-2021-4105?

CVE-2021-4105 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.86% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4105?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-4105?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST