A Stack-based Buffer Overflow vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS allows a network-based attacker, authenticated with low privileges to cause a Denial-of-Service (DoS).
Subscribing to telemetry sensors at scale causes all FPC connections to drop, resulting in an FPC crash and restart.
The issue was not seen when YANG packages for the specific sensors were installed.
This issue affects Junos OS:
* all versions before 22.4R3-S7,
* 23.2 version before 23.2R2-S4,
* 23.4 versions before 23.4R2.
Metrics
Affected Vendors & Products
References
History
Thu, 15 Jan 2026 22:15:00 +0000
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| Description | A Stack-based Buffer Overflow vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS allows a network-based attacker, authenticated with low privileges to cause a Denial-of-Service (DoS). Subscribing to telemetry sensors at scale causes all FPC connections to drop, resulting in an FPC crash and restart. The issue was not seen when YANG packages for the specific sensors were installed. This issue affects Junos OS: * all versions before 22.4R3-S7, * 23.2 version before 23.2R2-S4, * 23.4 versions before 23.4R2. | |
| Title | Junos OS: Subscribing to telemetry sensors at scale causes all FPCs to crash | |
| Weaknesses | CWE-121 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: juniper
Published:
Updated: 2026-01-15T21:12:08.631Z
Reserved: 2026-01-05T17:32:48.709Z
Link: CVE-2026-21903
Updated: 2026-01-15T21:12:05.572Z
Status : Received
Published: 2026-01-15T21:16:05.807
Modified: 2026-01-15T21:16:05.807
Link: CVE-2026-21903
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OpenCVE Enrichment
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