Junos
CVE-2026-21914
HIGH
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Juniper SRX Series devices are vulnerable to denial-of-service attacks when processing malformed GTP Modify Bearer Request messages, which trigger an improper lock condition that freezes packet processing threads and causes watchdog timeouts. An unauthenticated network attacker can exploit this without user interaction to crash the forwarding processor and cause complete traffic outages requiring device restart. No patch is currently available for affected Junos OS versions.
Technical ContextAI
Classified as CWE-667 (Improper Locking). Affects Junos. 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 c
RemediationAI
Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.
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Same weakness CWE-667 – Improper Locking
View allSame technique Denial Of Service
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External POC / Exploit Code
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