CVE-2026-21918
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
A Double Free vulnerability in the flow processing daemon (flowd) of Juniper Networks Junos OS on SRX and MX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). On all SRX and MX Series platforms, when during TCP session establishment a specific sequence of packets is encountered a double free happens. This causes flowd to crash and the respective FPC to restart.
This issue affects Junos OS on SRX and MX Series:
- all versions before 22.4R3-S7,
- 23.2 versions before 23.2R2-S3,
- 23.4 versions before 23.4R2-S4,
- 24.2 versions before 24.2R2.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Juniper Networks | Junos OS | 0 < 22.4R3-S7 | affected |
| Juniper Networks | Junos OS | 23.2 < 23.2R2-S3 | affected |
| Juniper Networks | Junos OS | 23.4 < 23.4R2-S4 | affected |
| Juniper Networks | Junos OS | 24.2 < 24.2R2 | affected |
Weaknesses
- CWE-415: CWE-415 Double Free
Workarounds
There are no known workarounds for this issue.
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: yes
- Technical Impact: partial
References
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