CVE-2021-22965 Denial of service in Pulse Connect Secure
An unauthenticated attacker can cause a denial of service on Pulse Connect Secure devices by sending a malformed 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-2021-22965?
CVE-2021-22965 is a high-severity denial of service vulnerability in Ivanti Connect Secure, published on 19 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in Pulse Connect Secure before 9.1R12.1 could allow an unauthenticated administrator to causes a denial of service when a malformed request is sent to the device.
Weakness: CWE-400
Which versions are affected by CVE-2021-22965?
It affects 2 products.
Products include Ivanti Connect Secure, Pulsesecure Pulse Connect Secure.
How do I fix CVE-2021-22965?
No fix has been published for CVE-2021-22965 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-2021-22965 being exploited?
There is no known exploitation of CVE-2021-22965 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-q8h8-595r-f56h.