Description
An Improper Locking vulnerability in the GTP plugin of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (Dos).
If an SRX Series device receives a specifically malformed GPRS Tunnelling Protocol (GTP) Modify Bearer Request message, a lock is acquired and never released. This results in other threads not being able to acquire a lock themselves, causing a watchdog timeout leading to FPC crash and restart. This issue leads to a complete traffic outage until the device has automatically recovered.
This issue affects Junos OS on SRX Series:
* all versions before 22.4R3-S8,
* 23.2 versions before 23.2R2-S5,
* 23.4 versions before 23.4R2-S6,
* 24.2 versions before 24.2R2-S3,
* 24.4 versions before 24.4R2-S2,
* 25.2 versions before 25.2R1-S1, 25.2R2.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Juniper Networks | Junos OS | < 22.4R3-S8, 23.2 – < 23.2R2-S5, 23.4 – < 23.4R2-S6, 24.2 – < 24.2R2-S3, 24.4 – < 24.4R2-S2, 25.2 – < 25.2R1-S1, 25.2R2 | 22.4R3-S8 |
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/JSA106015 vendor-advisory
- https://kb.juniper.net/JSA106015 vendor-advisory