CVE-2021-40856
Auerswald COMfortel 1400 IP and 2600 IP before 2.8G devices allow Authentication Bypass via the ...
Auerswald COMfortel 1400 IP and 2600 IP before 2.8G devices allow Authentication Bypass via the /about/../ substring.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
Auerswald COMfortel 1400 IP and 2600 IP before 2.8G devices allow Authentication Bypass via the /about/../ substring.
- Record
CVE-2021-40856- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:P/I:N/A:N - Weakness
- CWE-706
- Updated
- 2026-11-02
CVE List No score
Auerswald COMfortel 1400 IP and 2600 IP before 2.8G devices allow Authentication Bypass via the /about/../ substring.
- Record
CVE-2021-40856- Updated
- 2026-11-02
EUVDEUVD-2021-28012 No score
Auerswald COMfortel 1400 IP and 2600 IP before 2.8G devices allow Authentication Bypass via the /about/../ substring.
- Record
EUVD-2021-28012- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-j9m7-v9vc-r99f
Auerswald COMfortel 1400 IP and 2600 IP before 2.8G devices allow Authentication Bypass via the ...
Auerswald COMfortel 1400 IP and 2600 IP before 2.8G devices allow Authentication Bypass via the /about/../ substring.
- Record
GHSA-j9m7-v9vc-r99f- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-287
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Nuclei | Auerswald COMfortel 1400/2600/3600 IP - Authentication Bypass |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, Nuclei, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-40856 is a high vulnerability (CVSS 7.5) in Auerswald Comfortel 1400 Ip Firmware, published December 13, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 50.1%, the 98th percentile. No source names a fixed version.
References
redteam-pentesting.de/en/advisories/-advisories-publicised-vulnerability-analyses
packetstormsecurity.com/files/165162/Auerswald-COMfortel-1400-2600-3600-IP-2.8F-Authentication-Bypass.html
nvd.nist.gov/vuln/detail/CVE-2021-40856
github.com/advisories/GHSA-j9m7-v9vc-r99f