Vulnerability · Published Jul 9, 2026 · Assigned by juniper
CVE-2026-33803Junos OS Evolved: A port which has been inadvertently exposed can be reached by an attacker
Medium 6.5
In plain English
A medium-severity security flaw in Junos OS Evolved from Juniper Networks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities).
Official description
An Improper Restriction of Communication Channel to Intended Endpoints vulnerability in Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause a limited information disclosure and availability impact to the device. Due to a wrong initialization, a process which should only be able to communicate internally within the device can be reached over the network via an open port. This leads to a device being inadvertently exposed and increased CPU cycles spent processing ingress packets. This issue affects Junos OS Evolved: * all versions before 23.2R2-S7-EVO, * 23.4 versions before 23.4R2-S8-EVO, * 24.2 versions before 24.2R2-S5-EVO, * 24.4 versions before 24.4R2-S4-EVO, * 25.2 versions before 25.2R2-S1-EVO, * 25.4 versions before 25.4R1-S2-EVO.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Juniper Networks | Junos OS Evolved | 0 – before 23.2R2-S7-EVO23.4 – before 23.4R2-S8-EVO24.2 – before 24.2R2-S5-EVO24.4 – before 24.4R2-S4-EVO25.2 – before 25.2R2-S1-EVO25.4 – before 25.4R1-S2-EVO |
Weakness: CWE-923 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
References
- https://supportportal.juniper.net/JSA110078 vendor-advisory