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.
This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 5.5, requiring local system access to exploit with relatively low complexity without requiring user interaction requiring only low-level privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 42 products from juniper, from juniper, from juniper and 39 others, organizations running these solutions should prioritize assessment and patching.
Reported in 2026, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.
2026-07-09T22:17:07.747
2026-07-16T09:16:18.650
Modified
CVSSv3.1: 5.5 (MEDIUM)
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Operating System | juniper | junos | < 23.2 | Yes |
| Operating System | juniper | junos | 23.2 | Yes |
| Operating System | juniper | junos | 23.2 | Yes |
| Operating System | juniper | junos | 23.2 | Yes |
| Operating System | juniper | junos | 23.2 | Yes |
| Operating System | juniper | junos | 23.2 | Yes |
| Operating System | juniper | junos | 23.2 | Yes |
| Operating System | juniper | junos | 23.2 | Yes |
| Operating System | juniper | junos | 23.2 | Yes |
| Operating System | juniper | junos | 23.2 | Yes |
| Operating System | juniper | junos | 23.2 | Yes |
| Operating System | juniper | junos | 23.2 | Yes |
| Operating System | juniper | junos | 23.4 | Yes |
| Operating System | juniper | junos | 23.4 | Yes |
| Operating System | juniper | junos | 23.4 | Yes |
| Operating System | juniper | junos | 23.4 | Yes |
| Operating System | juniper | junos | 23.4 | Yes |
| Operating System | juniper | junos | 23.4 | Yes |
| Operating System | juniper | junos | 23.4 | Yes |
| Operating System | juniper | junos | 23.4 | Yes |
| Operating System | juniper | junos | 23.4 | Yes |
| Operating System | juniper | junos | 23.4 | Yes |
| Operating System | juniper | junos | 23.4 | Yes |
| Operating System | juniper | junos | 24.2 | Yes |
| Operating System | juniper | junos | 24.2 | Yes |
| Operating System | juniper | junos | 24.2 | Yes |
| Operating System | juniper | junos | 24.2 | Yes |
| Operating System | juniper | junos | 24.4 | Yes |
| Operating System | juniper | junos | 24.4 | Yes |
| Hardware | juniper | ex2300 | - | No |
| Hardware | juniper | ex2300-c | - | No |
| Hardware | juniper | ex3400 | - | No |
| Hardware | juniper | ex4000 | - | No |
| Hardware | juniper | ex4100 | - | No |
| Hardware | juniper | ex4100-f | - | No |
| Hardware | juniper | ex4100-h | - | No |
| Hardware | juniper | ex4100-h-12t | - | No |
| Hardware | juniper | ex4300 | - | No |
| Hardware | juniper | ex4400 | - | No |
| Hardware | juniper | ex4600 | - | No |
| Hardware | juniper | ex4650 | - | No |
| Hardware | juniper | ex9204 | - | No |
| Hardware | juniper | ex9208 | - | No |
| Hardware | juniper | ex9214 | - | No |
| Hardware | juniper | mx10004 | - | No |
| Hardware | juniper | mx10008 | - | No |
| Hardware | juniper | mx2008 | - | No |
| Hardware | juniper | mx2010 | - | No |
| Hardware | juniper | mx2020 | - | No |
| Hardware | juniper | mx204 | - | No |
| Hardware | juniper | mx240 | - | No |
| Hardware | juniper | mx301 | - | No |
| Hardware | juniper | mx304 | - | No |
| Hardware | juniper | mx480 | - | No |
| Hardware | juniper | mx960 | - | No |
| Hardware | juniper | qfx10008 | - | No |
| Hardware | juniper | qfx10016 | - | No |
| Hardware | juniper | qfx5110 | - | No |
| Hardware | juniper | qfx5120 | - | No |
| Hardware | juniper | qfx5130 | - | No |
| Hardware | juniper | qfx5140 | - | No |
| Hardware | juniper | qfx5200 | - | No |
| Hardware | juniper | qfx5210 | - | No |
| Hardware | juniper | qfx5220 | - | No |
| Hardware | juniper | qfx5230-64cd | - | No |
| Hardware | juniper | qfx5240 | - | No |
| Hardware | juniper | qfx5241 | - | No |
| Hardware | juniper | qfx5250 | - | No |
| Hardware | juniper | qfx5700 | - | No |
| Operating System | juniper | junos_os_evolved | < 23.2 | Yes |
| Operating System | juniper | junos_os_evolved | 23.2 | Yes |
| Operating System | juniper | junos_os_evolved | 23.2 | Yes |
| Operating System | juniper | junos_os_evolved | 23.2 | Yes |
| Operating System | juniper | junos_os_evolved | 23.2 | Yes |
| Operating System | juniper | junos_os_evolved | 23.2 | Yes |
| Operating System | juniper | junos_os_evolved | 23.2 | Yes |
| Operating System | juniper | junos_os_evolved | 23.2 | Yes |
| Operating System | juniper | junos_os_evolved | 23.2 | Yes |
| Operating System | juniper | junos_os_evolved | 23.2 | Yes |
| Operating System | juniper | junos_os_evolved | 23.2 | Yes |
| Operating System | juniper | junos_os_evolved | 23.2 | Yes |
| Operating System | juniper | junos_os_evolved | 23.4 | Yes |
| Operating System | juniper | junos_os_evolved | 23.4 | Yes |
| Operating System | juniper | junos_os_evolved | 23.4 | Yes |
| Operating System | juniper | junos_os_evolved | 23.4 | Yes |
| Operating System | juniper | junos_os_evolved | 23.4 | Yes |
| Operating System | juniper | junos_os_evolved | 23.4 | Yes |
| Operating System | juniper | junos_os_evolved | 23.4 | Yes |
| Operating System | juniper | junos_os_evolved | 23.4 | Yes |
| Operating System | juniper | junos_os_evolved | 23.4 | Yes |
| Operating System | juniper | junos_os_evolved | 23.4 | Yes |
| Operating System | juniper | junos_os_evolved | 23.4 | Yes |
| Operating System | juniper | junos_os_evolved | 23.4 | Yes |
| Operating System | juniper | junos_os_evolved | 24.2 | Yes |
| Operating System | juniper | junos_os_evolved | 24.2 | Yes |
| Operating System | juniper | junos_os_evolved | 24.2 | Yes |
| Operating System | juniper | junos_os_evolved | 24.4 | Yes |
| Operating System | juniper | junos_os_evolved | 24.4 | Yes |
| Operating System | juniper | junos_os_evolved | 24.4 | Yes |
| Hardware | juniper | ex2300 | - | No |
| Hardware | juniper | ex2300-c | - | No |
| Hardware | juniper | ex3400 | - | No |
| Hardware | juniper | ex4000 | - | No |
| Hardware | juniper | ex4100 | - | No |
| Hardware | juniper | ex4100-f | - | No |
| Hardware | juniper | ex4100-h | - | No |
| Hardware | juniper | ex4100-h-12t | - | No |
| Hardware | juniper | ex4300 | - | No |
| Hardware | juniper | ex4400 | - | No |
| Hardware | juniper | ex4600 | - | No |
| Hardware | juniper | ex4650 | - | No |
| Hardware | juniper | ex9204 | - | No |
| Hardware | juniper | ex9208 | - | No |
| Hardware | juniper | ex9214 | - | No |
| Hardware | juniper | mx10004 | - | No |
| Hardware | juniper | mx10008 | - | No |
| Hardware | juniper | mx2008 | - | No |
| Hardware | juniper | mx2010 | - | No |
| Hardware | juniper | mx2020 | - | No |
| Hardware | juniper | mx204 | - | No |
| Hardware | juniper | mx240 | - | No |
| Hardware | juniper | mx301 | - | No |
| Hardware | juniper | mx304 | - | No |
| Hardware | juniper | mx480 | - | No |
| Hardware | juniper | mx960 | - | No |
| Hardware | juniper | qfx10008 | - | No |
| Hardware | juniper | qfx10016 | - | No |
| Hardware | juniper | qfx5110 | - | No |
| Hardware | juniper | qfx5120 | - | No |
| Hardware | juniper | qfx5130 | - | No |
| Hardware | juniper | qfx5140 | - | No |
| Hardware | juniper | qfx5200 | - | No |
| Hardware | juniper | qfx5210 | - | No |
| Hardware | juniper | qfx5220 | - | No |
| Hardware | juniper | qfx5230-64cd | - | No |
| Hardware | juniper | qfx5240 | - | No |
| Hardware | juniper | qfx5241 | - | No |
| Hardware | juniper | qfx5250 | - | No |
| Hardware | juniper | qfx5700 | - | No |
SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For juniper's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.