Unauthenticated Remote Code Execution on COSLAT Firewall
Summary
| CVE | CVE-2021-4105 |
|---|---|
| State | PUBLISHED |
| Assigner | TR-CERT |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2023-02-24 12:15:30 UTC |
| Updated | 2026-05-18 13:16:31 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 9.8 CRITICAL from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.007250000 probability, percentile 0.728010000 (date 2026-05-25)
Problem Types: CWE-755 | NVD-CWE-Other | CWE-755 CWE-755 Improper Handling of Exceptional Conditions
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | [email protected] | Secondary | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Hardware | Bg-tek | Coslat Bx5s1d3 | - | All | All | All |
| Operating System | Bg-tek | Coslat Bx5s1d3 Firmware | All | All | All | All |
| Hardware | Bg-tek | Coslat Bx5s1d4 | - | All | All | All |
| Operating System | Bg-tek | Coslat Bx5s1d4 Firmware | All | All | All | All |
| Hardware | Bg-tek | Coslat Bx5s1d5 | - | All | All | All |
| Operating System | Bg-tek | Coslat Bx5s1d5 Firmware | All | All | All | All |
| Hardware | Bg-tek | Coslat Rm1ds1000 | - | All | All | All |
| Operating System | Bg-tek | Coslat Rm1ds1000 Firmware | All | All | All | All |
| Hardware | Bg-tek | Coslat Rm2ds2000 | - | All | All | All |
| Operating System | Bg-tek | Coslat Rm2ds2000 Firmware | All | All | All | All |
| Hardware | Bg-tek | Coslat Rm2s200 | - | All | All | All |
| Operating System | Bg-tek | Coslat Rm2s200 Firmware | All | All | All | All |
| Hardware | Bg-tek | Coslat Rm3s300 | - | All | All | All |
| Operating System | Bg-tek | Coslat Rm3s300 Firmware | All | All | All | All |
| Hardware | Bg-tek | Coslat Rm4s500 | - | All | All | All |
| Operating System | Bg-tek | Coslat Rm4s500 Firmware | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | BG-TEK | COSLAT Firewall | affected 5.24.0.r.20180630 5.24.0.r.20210727 custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| ÖNEMLİ: Kritik Güncelleme - 27-07-2021 tarihinde yayınlanan güncelleme içeriği ~ Coslat Firewall Blog | af854a3a-2127-422b-91ae-364da2661108 | blog.coslat.com | Vendor Advisory |
| Ulusal Siber Olaylara Müdahale Merkezi - USOM | af854a3a-2127-422b-91ae-364da2661108 | www.usom.gov.tr | Third Party Advisory |
| siberguvenlik.gov.tr/guvenlik-bildirimleri/detay/tr-23-0108 | [email protected] | siberguvenlik.gov.tr | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2021-07-26T21:00:00.000Z | Vendor patched the vulnerability. |
Solutions
CNA: Update the version to >= 5.24.0.r.20210727
There are currently no legacy QID mappings associated with this CVE.