CVE-2025-48839 Memory corruption in FortiADC
An authenticated attacker can execute arbitrary code on FortiADC devices via specially crafted HTTP requests exploiting an out-of-bounds write vulnerability.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-48839?
CVE-2025-48839 is a medium-severity memory corruption vulnerability in Fortinet FortiADC, published on 18 Nov 2025. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
An Out-of-bounds Write vulnerability [CWE-787] in FortiADC 8.0.0, 7.6.0 through 7.6.2, 7.4.0 through 7.4.7, 7.2 all versions, 7.1 all versions, 7.0 all versions, 6.2 all versions may allow an authenticated attacker to execute arbitrary code via specially crafted HTTP requests.
Weakness: CWE-787
Which versions are affected by CVE-2025-48839?
It affects 1 product.
Products include Fortinet Fortiadc.
How do I fix CVE-2025-48839?
No fix has been published for CVE-2025-48839 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-48839 being exploited?
There is no known exploitation of CVE-2025-48839 in the wild and no public exploit code.
Other vulnerabilities in Fortinet FortiADC
Sources
Also known as GHSA-25x7-2m3g-jhfw.