B426 Web Configuration Authentication Bypass
Priority MEDIUM 40CWE-284Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-284.
Summary
This vulnerability could allow an attacker to hijack a session while a user is logged in the configuration web page. This vulnerability was discovered by a security researcher in B426 and found during internal product tests in B426-CN/B429-CN, and B426-M and has been fixed already starting from version 3.08 on, which was released on June 2019.
Why it matters now
EPSS 0.00839 58th percentileScored 2026-11-07
Fix Fixed B426 Firmware (Bosch): 03.08B426-CN/B429- CN Firmware (Bosch): 03.08+1 more product
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Bosch | B426 Firmware | before 03.08 | 03.08 | Patch available | CNA |
| Bosch | B426-CN/B429- CN Firmware | before 03.08 | 03.08 | Patch available | CNA |
| Bosch | B426-M Firmware | before 03.10 | 03.10 | Patch available | CNA |
- B426 Firmware VendorBosch Affected before 03.08 Fixed in 03.08 Patch available CNA
- B426-CN/B429- CN Firmware VendorBosch Affected before 03.08 Fixed in 03.08 Patch available CNA
- B426-M Firmware VendorBosch Affected before 03.10 Fixed in 03.10 Patch available CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:bosch:b426_firmware:*:*:*:*:*:*:*:* | before 03.08 | Vulnerable | Bosch |
| cpe:2.3:h:bosch:b426:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Bosch |
| cpe:2.3:o:bosch:b426-cn_firmware:*:*:*:*:*:*:*:* | before 03.08 | Vulnerable | Bosch |
| cpe:2.3:h:bosch:b426-cn:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Bosch |
| cpe:2.3:o:bosch:b429-cn_firmware:*:*:*:*:*:*:*:* | before 03.08 | Vulnerable | Bosch |
| cpe:2.3:h:bosch:b429-cn:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Bosch |
| cpe:2.3:o:bosch:b426-m_firmware:*:*:*:*:*:*:*:* | before 03.10 | Vulnerable | Bosch |
| cpe:2.3:h:bosch:b426-m:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Bosch |
- cpe:2.3:o:bosch:b426_firmware:*:*:*:*:*:*:*:* Versions before 03.08 Vulnerable ·Bosch
- cpe:2.3:h:bosch:b426:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Bosch
- cpe:2.3:o:bosch:b426-cn_firmware:*:*:*:*:*:*:*:* Versions before 03.08 Vulnerable ·Bosch
- cpe:2.3:h:bosch:b426-cn:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Bosch
- cpe:2.3:o:bosch:b429-cn_firmware:*:*:*:*:*:*:*:* Versions before 03.08 Vulnerable ·Bosch
- cpe:2.3:h:bosch:b429-cn:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Bosch
- cpe:2.3:o:bosch:b426-m_firmware:*:*:*:*:*:*:*:* Versions before 03.10 Vulnerable ·Bosch
- cpe:2.3:h:bosch:b426-m:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Bosch
Remediation
- Fix · CNA B426 Firmware (Bosch) Fixed in 03.08
- Fix · CNA B426-CN/B429- CN Firmware (Bosch) Fixed in 03.08
- Fix · CNA B426-M Firmware (Bosch) Fixed in 03.10
Timeline
- 2026-10-02 Threatist record created from CVE-2021-23845
- 2026-10-03 Alias added: GHSA-4fvc-h857-qw9g
References
Sources
- CVE-2021-23845 · CVE Program
- CVE-2021-23845 · NVD
- FIRST EPSS
- GHSA-4fvc-h857-qw9g · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences