Description

An Improper Validation of Syntactic Correctness of Input vulnerability in the Web-Filtering 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 device configured for UTM Web-Filtering receives a specifically malformed SSL packet, this will cause an FPC crash and restart. This issue affects Junos OS on SRX Series: * 23.2 versions from 23.2R2-S2 before 23.2R2-S5,  * 23.4 versions from 23.4R2-S1 before 23.4R2-S5, * 24.2 versions before 24.2R2-S2, * 24.4 versions before 24.4R1-S3, 24.4R2. Earlier versions of Junos are also affected, but no fix is available.

INFO

Published Date :

2026-01-15T20:27:11.214Z

Last Modified :

2026-01-15T21:12:37.455Z

Source :

juniper
AFFECTED PRODUCTS

The following products are affected by CVE-2026-21917 vulnerability.

Vendors Products
Juniper
  • Srx
  • Srx Series
Juniper Networks
  • Junos Os
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-21917.

URL Resource
https://kb.juniper.net/JSA105996 cve-icon cve-icon
https://supportportal.juniper.net/JSA105996 cve-icon cve-icon
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CVSS Vulnerability Scoring System

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