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.
Metrics
Affected Vendors & Products
No advisories yet.
Solution
The following software releases have been updated to resolve this specific issue: 23.2R2-S5, 23.4R2-S5, 24.2R2-S2, 24.4R1-S3, 24.4R2, 25.2R1, and all subsequent releases.
Workaround
There are no known workarounds for this issue.
Thu, 15 Jan 2026 22:15:00 +0000
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ssvc
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Thu, 15 Jan 2026 20:45:00 +0000
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| 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. | |
| Title | Junos OS: SRX Series: Specifically malformed SSL packet causes FPC crash | |
| Weaknesses | CWE-1286 | |
| References |
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| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: juniper
Published:
Updated: 2026-01-15T21:12:37.455Z
Reserved: 2026-01-05T17:32:48.711Z
Link: CVE-2026-21917
Updated: 2026-01-15T21:12:34.488Z
Status : Received
Published: 2026-01-15T21:16:07.877
Modified: 2026-01-15T21:16:07.877
Link: CVE-2026-21917
No data.
OpenCVE Enrichment
No data.