CVE-2018-25236 Hirschmann HiOS HiSecOS Authentication Bypass via HTTP Management
Unauthenticated remote attackers can bypass authentication in Hirschmann HiOS/HiSecOS HTTP management to gain administrative access.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2018-25236?
CVE-2018-25236 is a critical authentication bypass vulnerability in Belden Hirschmann HiOS, published on 3 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Hirschmann HiOS and HiSecOS products RSP, RSPE, RSPS, RSPL, MSP, EES, EESX, GRS, OS, RED, EAGLE contain an authentication bypass vulnerability in the HTTP(S) management module that allows unauthenticated remote attackers to gain administrative access by crafting specially formed HTTP requests. Attackers can exploit improper authentication handling to obtain the authentication status and privileges of a previously authenticated user without providing valid credentials.
Weakness: CWE-287
Which versions are affected by CVE-2018-25236?
How do I fix CVE-2018-25236?
No fix has been published for CVE-2018-25236 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2018-25236 being exploited?
There is no known exploitation of CVE-2018-25236 in the wild and no public exploit code.
Sources
Also known as GHSA-9hhf-w3pr-8g2c.