Description

A Stack-based Buffer Overflow vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS allows a network-based attacker, authenticated with low privileges to cause a Denial-of-Service (DoS). Subscribing to telemetry sensors at scale causes all FPC connections to drop, resulting in an FPC crash and restart. The issue was not seen when YANG packages for the specific sensors were installed. This issue affects Junos OS:  * all versions before 22.4R3-S7, * 23.2 version before 23.2R2-S4, * 23.4 versions before 23.4R2.

INFO

Published Date :

2026-01-15T20:18:36.767Z

Last Modified :

2026-01-15T21:12:08.631Z

Source :

juniper
AFFECTED PRODUCTS

The following products are affected by CVE-2026-21903 vulnerability.

Vendors Products
Juniper Networks
  • Junos Os
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-21903.

URL Resource
https://kb.juniper.net/JSA106022 cve-icon cve-icon
https://supportportal.juniper.net/JSA106022 cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
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Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact