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.
Metrics
Affected Vendors & Products
References
History
Thu, 15 Jan 2026 21:15:00 +0000
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Thu, 15 Jan 2026 20:30:00 +0000
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| 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. | |
| Title | Junos OS: SRX Series: A specifically malformed GTP message will cause an FPC crash | |
| Weaknesses | CWE-667 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: juniper
Published:
Updated: 2026-01-15T20:44:30.550Z
Reserved: 2026-01-05T17:32:48.711Z
Link: CVE-2026-21914
Updated: 2026-01-15T20:44:26.736Z
Status : Received
Published: 2026-01-15T21:16:07.700
Modified: 2026-01-15T21:16:07.700
Link: CVE-2026-21914
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OpenCVE Enrichment
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