CVE-2026-15579 Memory corruption in TN-4500B Series
Remote attackers can cause a denial of service on Moxa Ethernet switches by sending overly long input during web login, triggering a buffer overflow.
- 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-2026-15579?
CVE-2026-15579 is a high-severity memory corruption vulnerability in Moxa TN-4500B Series, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An out-of-bounds write vulnerability exists in some of the Ethernet switches because of improper validation of the username field length during Web login processing. This may allow a remote attacker to submit a specially crafted overly long input, triggering a buffer overflow that can cause the authentication process to crash and result in a Denial of Service (DoS) attack.
Weakness: CWE-787
Which versions are affected by CVE-2026-15579?
How do I fix CVE-2026-15579?
No fix has been published for CVE-2026-15579 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-2026-15579 being exploited?
There is no known exploitation of CVE-2026-15579 in the wild and no public exploit code.
Sources
Also known as GHSA-hv3x-fr88-gcjp.