CVE-2023-39340 Denial of service in Connect Secure
An attacker can cause a Denial of Service on Ivanti Connect Secure appliances by sending a specific request.
- 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-2023-39340?
CVE-2023-39340 is a high-severity denial of service vulnerability in Ivanti Connect Secure, published on 16 Dec 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability exists on all versions of Ivanti Connect Secure below 22.6R2 where an attacker can send a specific request which may lead to Denial of Service (DoS) of the appliance.
Which versions are affected by CVE-2023-39340?
It affects 1 product.
Products include Ivanti Connect Secure.
How do I fix CVE-2023-39340?
No fix has been published for CVE-2023-39340 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-2023-39340 being exploited?
There is no known exploitation of CVE-2023-39340 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-gfr7-4r5q-4qrx.