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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Juniper Networks | Junos OS | 23.2R2-S2 – < 23.2R2-S5, 23.4R2-S1 – < 23.4R2-S5, 24.2 – < 24.2R2-S2, 24.4 – < 24.4R1-S3, 24.4R2 | 23.2R2-S5 |
Advisories 2
- NCSC-2026-0017 Kwetsbaarheden verholpen in Juniper Networks JunOS NCSC-NL (Netherlands) · Jan 16, 2026
- WID-SEC-2026-0117 Juniper Junos OS, Junos Space: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 15, 2026
References
- https://supportportal.juniper.net/JSA105996 vendor-advisory
- https://kb.juniper.net/JSA105996 vendor-advisory