CVE-2025-5456 Denial of service in Connect Secure
Remote unauthenticated attackers can cause a denial of service in Ivanti Connect Secure and related gateways via a buffer over-read vulnerability.
- 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-2025-5456?
CVE-2025-5456 is a high-severity denial of service vulnerability in Ivanti Connect Secure, published on 12 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A buffer over-read vulnerability in Ivanti Connect Secure before 22.7R2.8 or 22.8R2, Ivanti Policy Secure before 22.7R1.5, Ivanti ZTA Gateway before 2.8R2.3-723 and Ivanti Neurons for Secure Access before 22.8R1.4 (Fix deployed on 02-Aug-2025) allows a remote unauthenticated attacker to trigger a denial of service. CWE-125
Weakness: CWE-125
Which versions are affected by CVE-2025-5456?
It affects 4 products.
Products include Ivanti Connect Secure, Ivanti Neurons for Secure Access, Ivanti Policy Secure, Ivanti Zero Trust Access Gateway.
How do I fix CVE-2025-5456?
No fix has been published for CVE-2025-5456 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-5456 being exploited?
There is no known exploitation of CVE-2025-5456 in the wild and no public exploit code.
Other vulnerabilities in Ivanti Connect Secure
- CVE-2021-22893 Ivanti Pulse Connect Secure Use-After-Free
- CVE-2019-11510 Ivanti Pulse Connect Secure Arbitrary File Read
- CVE-2024-21887 Ivanti Connect Secure and Policy Secure Command Injection
- CVE-2025-22457 Ivanti Connect Secure, Policy Secure, and ZTA Gateways Stack-Based Buffer Overflow
- CVE-2025-0282 Ivanti Connect Secure, Policy Secure, and ZTA Gateways Stack-Based Buffer Overflow
Sources
Also known as GHSA-68xg-w9gf-2gr9.