Auerswald COMfortel - Path Traversal (CVE-2021-40856)
Description
Auerswald COMfortel 1400 IP and 2600 IP before 2.8G devices allow Authentication Bypass via the /about/../ substring.
psychologyCrowdSec Analysis
CVE-2021-40856 is a vulnerability affecting Auerswald COMfortel IP devices, where improper path handling enables authentication bypass through certain crafted requests.
CrowdSec has been tracking this vulnerability and its exploits since 1st of June 2025.
Insights from the CrowdSec network reveal that the attackers trying to exploit CVE-2021-40856 are composed of a fairly even mix of opportunistic and targeted actors. Some attackers employ preliminary reconnaissance, while others use indiscriminate scanning. Data from the CrowdSec community also indicates a gradual decrease in attacks targeting CVE-2021-40856. While still present in the wild, exploitation levels have dropped noticeably week-over-week. This may signal that the vulnerability is becoming less relevant or that defenses are improving fast enough for attackers to lose interest.
Observed exploitation attempts typically target URLs containing /about/.. combined with specific request patterns.
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| Event | Date |
|---|---|
| CVE Published | 2021-12-13 |
| Rule Released | 2025-06-01 |
| CrowdSec First Seen | 2025-06-05 |