Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Juniper Networks | Junos OS | < 23.2R2-S7, 23.4 – < 23.4R2-S7, 24.2 – < 24.2R2, 24.4 – < 24.4R1-S2 | 23.2R2-S7 |
| Juniper Networks | Junos OS Evolved | < 23.2R2-S7-EVO, 23.4 – < 23.4R2-S8-EVO, 24.2 – < 24.2R2-EVO, 24.4 – < 24.4R1-S3-EVO | 23.2R2-S7-EVO |
Advisories 2
- NCSC-2026-0224 Kwetsbaarheden verholpen in Juniper Networks Junos OS en Junos OS Evolved NCSC-NL (Netherlands) · Jul 13, 2026
- WID-SEC-2026-2257 Juniper JUNOS und JUNOS Evolved: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 9, 2026
References
- https://supportportal.juniper.net/JSA110085 vendor-advisory