Improper Locking in Juniper Networks Junos OS on SRX Series
CVE-2026-21914

8.7HIGH

Key Information:

Vendor

Juniper Networks
Status
Junos Os
Vendor
CVE Published:
15 January 2026

Badges

👾 Exploit Exists

What is CVE-2026-21914?

An Improper Locking vulnerability in the GTP plugin of Juniper Networks Junos OS on SRX Series can be exploited by an unauthenticated, network-based attacker. This vulnerability arises when a specifically malformed GPRS Tunnelling Protocol (GTP) Modify Bearer Request message is received, leading to an unacquired lock that blocks other threads from functioning correctly. Consequently, this results in a complete traffic outage due to a watchdog timeout that causes an FPC crash and requires a restart. Affected devices may automatically recover, but not without resulting in service disruptions.

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Affected Version(s)

Junos OS SRX Series 0 < 22.4R3-S8

Junos OS SRX Series 23.2 < 23.2R2-S5

Junos OS SRX Series 23.4 < 23.4R2-S6

References

https://supportportal.juniper.net/JSA106015
vendor-advisory
https://kb.juniper.net/JSA106015
vendor-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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