Junos OS (SRX firewalls)
CVE-2026-57025: EX Series, QFX Series, MX Series: A specific 'show l2-learning/ethernet-switching' command causes l2ald crash
A Return of Pointer Value Outside of Expected Range vulnerability in the fileio library of Juniper Networks Junos OS and Junos OS Evolved allows a local, low-privilged attacker to cause a Denial-of-Service (DoS).
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Junos OS (EX Series, QFX Series, MX Series) 0 | 23.2R2-S7 or later |
| Junos OS (EX Series, QFX Series, MX Series) 23.4 | 23.4R2-S7 or later |
| Junos OS (EX Series, QFX Series, MX Series) 24.2 | 24.2R2 or later |
| Junos OS (EX Series, QFX Series, MX Series) 24.4 | 24.4R1-S2 or later |
| Junos OS Evolved 0 | 23.2R2-S7-EVO or later |
| Junos OS Evolved 23.4 | 23.4R2-S8-EVO or later |
| Junos OS Evolved 24.2 | 24.2R2-EVO or later |
| Junos OS Evolved 24.4 | 24.4R1-S3-EVO or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A Return of Pointer Value Outside of Expected Range vulnerability in the fileio library of Juniper Networks Junos OS and Junos OS Evolved allows a local, low-privilged attacker to cause a Denial-of-Service (DoS).
On EX Series, QFX Series and MX Series a low-privileged attacker issuing a specific 'show l2-learning' or 'show ethernet-switching' command will cause an l2ald crash which will lead to a temporary service impact for all layer 2 services until the process has automatically restarted.
This issue affects EX Series, QFX Series, MX Series: Junos OS:
- all versions before 23.2R2-S7,
- 23.4 versions before 23.4R2-S7,
- 24.2 versions before 24.2R2,
- 24.4 versions before 24.4R1-S2.
Junos OS Evolved: * all versions before 23.2R2-S7-EVO, * 23.4 versions before 23.4R2-S8-EVO, * 24.2 versions before 24.2R2-EVO, * 24.4 versions before 24.4R1-S3-EVO.
Workarounds
There are no known workarounds for this issue.
To reduce the risk of exploitation use access lists or firewall filters to limit access to the CLI only from trusted hosts and administrators.
Exploitation
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.