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.
Metrics
Affected Vendors & Products
References
History
Fri, 23 Jan 2026 19:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Juniper junos
Juniper srx1500 Juniper srx1600 Juniper srx2300 Juniper srx300 Juniper srx320 Juniper srx340 Juniper srx345 Juniper srx380 Juniper srx4100 Juniper srx4120 Juniper srx4200 Juniper srx4300 Juniper srx4600 Juniper srx4700 Juniper srx5400 Juniper srx5600 Juniper srx5800 |
|
| CPEs | cpe:2.3:h:juniper:srx1500:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:srx1600:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:srx2300:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:srx300:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:srx320:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:srx340:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:srx345:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:srx380:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:srx4100:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:srx4120:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:srx4200:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:srx4300:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:srx4600:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:srx4700:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:srx5400:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:srx5600:-:*:*:*:*:*:*:* cpe:2.3:h:juniper:srx5800:-:*:*:*:*:*:*:* cpe:2.3:o:juniper:junos:23.2:r2-s2:*:*:*:*:*:* cpe:2.3:o:juniper:junos:23.2:r2-s3:*:*:*:*:*:* cpe:2.3:o:juniper:junos:23.2:r2-s4:*:*:*:*:*:* cpe:2.3:o:juniper:junos:23.4:r2-s1:*:*:*:*:*:* cpe:2.3:o:juniper:junos:23.4:r2-s2:*:*:*:*:*:* cpe:2.3:o:juniper:junos:23.4:r2-s3:*:*:*:*:*:* cpe:2.3:o:juniper:junos:23.4:r2-s4:*:*:*:*:*:* cpe:2.3:o:juniper:junos:24.2:-:*:*:*:*:*:* cpe:2.3:o:juniper:junos:24.2:r1-s1:*:*:*:*:*:* cpe:2.3:o:juniper:junos:24.2:r1-s2:*:*:*:*:*:* cpe:2.3:o:juniper:junos:24.2:r1:*:*:*:*:*:* cpe:2.3:o:juniper:junos:24.2:r2-s1:*:*:*:*:*:* cpe:2.3:o:juniper:junos:24.2:r2:*:*:*:*:*:* cpe:2.3:o:juniper:junos:24.4:-:*:*:*:*:*:* cpe:2.3:o:juniper:junos:24.4:r1-s2:*:*:*:*:*:* cpe:2.3:o:juniper:junos:24.4:r1:*:*:*:*:*:* cpe:2.3:o:juniper:junos:24.4:r2:*:*:*:*:*:* |
|
| Vendors & Products |
Juniper junos
Juniper srx1500 Juniper srx1600 Juniper srx2300 Juniper srx300 Juniper srx320 Juniper srx340 Juniper srx345 Juniper srx380 Juniper srx4100 Juniper srx4120 Juniper srx4200 Juniper srx4300 Juniper srx4600 Juniper srx4700 Juniper srx5400 Juniper srx5600 Juniper srx5800 |
Fri, 16 Jan 2026 14:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Juniper
Juniper srx Juniper srx Series Juniper Networks Juniper Networks junos Os |
|
| Vendors & Products |
Juniper
Juniper srx Juniper srx Series Juniper Networks Juniper Networks junos Os |
Thu, 15 Jan 2026 22:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Thu, 15 Jan 2026 20:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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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Status: PUBLISHED
Assigner: juniper
Published: 2026-01-15T20:27:11.214Z
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 : Analyzed
Published: 2026-01-15T21:16:07.877
Modified: 2026-01-23T19:41:44.000
Link: CVE-2026-21917
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