CVE-2026-21903
6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Juniper Networks | Junos OS | 0 < 22.4R3-S7 | affected |
| Juniper Networks | Junos OS | 23.2 < 23.2R2-S4 | affected |
| Juniper Networks | Junos OS | 23.4 < 23.4R2 | affected |
Weaknesses
- CWE-121: CWE-121 Stack-based Buffer Overflow
Workarounds
There are no known workarounds for this issue.
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
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