Description

An Unchecked Return Value vulnerability in the DNS module of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). If an SRX Series device configured for DNS processing, receives a specifically formatted DNS request flowd will crash and restart, which causes a service interruption until the process has recovered. This issue affects Junos OS on SRX Series: * 23.4 versions before 23.4R2-S5, * 24.2 versions before 24.2R2-S1, * 24.4 versions before 24.4R2. This issue does not affect Junos OS versions before 23.4R1.

INFO

Published Date :

2026-01-15T20:28:10.526Z

Last Modified :

2026-01-15T20:59:21.070Z

Source :

juniper
AFFECTED PRODUCTS

The following products are affected by CVE-2026-21920 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-2026-21920.

URL Resource
https://kb.juniper.net/JSA106020 cve-icon cve-icon
https://supportportal.juniper.net/JSA106020 cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
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SS Confidentiality
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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