CVE & CISA-KEV Catalog

CVE-2021-4105

CRITICAL

9.8

CVSS v3

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.

How to fix

Remediation Available

coslat bx5s1d3 firmwareNVD

Affected:>= 5.24.0.r.20180630, < 5.24.0.r.20210727Fixed in:5.24.0.r.20210727CVE-2021-4105derived from NVD

coslat bx5s1d4 firmwareNVD

Affected:>= 5.24.0.r.20180630, < 5.24.0.r.20210727Fixed in:5.24.0.r.20210727CVE-2021-4105derived from NVD

coslat bx5s1d5 firmwareNVD

Affected:>= 5.24.0.r.20180630, < 5.24.0.r.20210727Fixed in:5.24.0.r.20210727CVE-2021-4105derived from NVD

coslat rm1ds1000 firmwareNVD

Affected:>= 5.24.0.r.20180630, < 5.24.0.r.20210727Fixed in:5.24.0.r.20210727CVE-2021-4105derived from NVD

coslat rm2ds2000 firmwareNVD

Affected:>= 5.24.0.r.20180630, < 5.24.0.r.20210727Fixed in:5.24.0.r.20210727CVE-2021-4105derived from NVD

coslat rm2s200 firmwareNVD

Affected:>= 5.24.0.r.20180630, < 5.24.0.r.20210727Fixed in:5.24.0.r.20210727CVE-2021-4105derived from NVD

coslat rm3s300 firmwareNVD

Affected:>= 5.24.0.r.20180630, < 5.24.0.r.20210727Fixed in:5.24.0.r.20210727CVE-2021-4105derived from NVD

coslat rm4s500 firmwareNVD

Affected:>= 5.24.0.r.20180630, < 5.24.0.r.20210727Fixed in:5.24.0.r.20210727CVE-2021-4105derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

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

Exploit Intelligence

0.86%probability of exploitation in 30 days

54thpercentile

Moderate risk: more likely to be exploited than 54% of all known CVEs.

References

Vendor Advisory1

blog.coslat.com

Third-Party Advisory1

usom.gov.tr

Other references1

siberguvenlik.gov.tr

Related Vulnerabilities

Other CWE-755 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-5638	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-7247	Critical	9.8	99%	KEV	Fix
CVE-2023-36933	High	7.5	72%	-	Fix
CVE-2018-0934	High	7.5	66%	-	Fix
CVE-2019-14287	High	8.8	64%	-	Fix
CVE-2019-12815	Critical	9.8	58%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-18.