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CVE-2026-21917

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CVE-2026-21917

Published: Jan 15, 2026

Modified: Jan 15, 2026

PUBLISHED

CVSS v3.1

7.5

HIGH

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.

VendorProductVersions

Juniper Networks

Junos OS

affected
23.2R2-S2 - < 23.2R2-S5
affected
23.4R2-S1 - < 23.4R2-S5
affected
24.2 - < 24.2R2-S2
affected
24.4 - < 24.4R1-S3, 24.4R2

Weaknesses (CWE)

CWE-1286

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

References

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