CVE-2023-36831 Junos OS: SRX Series: jbuf memory leak when SSL Proxy and UTM Web-Filtering is applied
A memory leak in Junos OS SRX Series causes denial of service when SSL Proxy and UTM Web-Filtering are enabled, requiring a reboot to restore service.
- 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-2023-36831?
CVE-2023-36831 is a high-severity denial of service vulnerability in Juniper Junos, published on 14 Jul 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An Improper Check or Handling of Exceptional Conditions vulnerability in the UTM (Unified Threat Management) Web-Filtering feature of Juniper Networks Junos OS on SRX Series causes a jbuf memory leak to occur when accessing certain websites, eventually leading to a Denial of Service (DoS) condition. Service restoration is only possible by rebooting the system.
The jbuf memory leak only occurs in SSL Proxy and UTM Web-Filtering configurations. Other products, platforms, and configurations are not affected by this vulnerability.
This issue affects Juniper Networks Junos OS on SRX Series: 22.2 versions prior to 22.2R3; 22.3 versions prior to 22.3R2-S1, 22.3R3; 22.4 versions prior to 22.4R1-S2, 22.4R2.
This issue does not affect Juniper Networks Junos OS versions prior to 22.2R2.
Weakness: CWE-703
Which versions are affected by CVE-2023-36831?
It affects 1 product.
Products include Juniper Junos.
How do I fix CVE-2023-36831?
No fix has been published for CVE-2023-36831 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-2023-36831 being exploited?
There is no known exploitation of CVE-2023-36831 in the wild and no public exploit code.
Other vulnerabilities in Juniper Junos
- CVE-2023-36845 Juniper Junos OS EX Series and SRX Series PHP External Variable Modification
- CVE-2020-1631 Juniper Junos OS Path Traversal
- CVE-2025-21590 Juniper Junos OS Improper Isolation or Compartmentalization
- CVE-2023-36851 Juniper Junos OS SRX Series Missing Authentication for Critical Function
- CVE-2023-36844 Juniper Junos OS EX Series PHP External Variable Modification
Sources
Also known as GHSA-g6m3-8xg2-qjhj.