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CVE-2026-21920

🔴 HIGH

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...

Published
Jan 15, 2026
Last Modified
Jan 16, 2026
Views
11
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0

Description

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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.

CVSS Scores

CVSS 3.1 7.5
7.5
HIGH
CVSS 2.0 7.5

References

kb.juniper.net supportportal.juniper.net

Additional Information

Source
sirt@juniper.net
State
Undergoing analysis

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