A Missing Synchronization vulnerability in the flow collector handler of Juniper Networks Junos OS Evolved on QFX Series allows an adjacent, unauthenticated attacker to cause a Denial-of-Service (DoS). When the reachability of an sFlow collector changes, the corresponding next-hop entry is updated. If this update occurs simultaneously with the sFlow thread accessing the next-hop data (which is outside the attackers control), it causes the evo-pfemand process to crash, impacting all traffic forwarding until the automatic process restart has completed. This issue affects Junos OS Evolved on QFX Series: * all 23.2 versions, * 23.4 versions before 23.4R2-S7-EVO, * 24.2 versions before 24.2R2-S5-EVO, * 24.4 versions before 24.4R2-S3-EVO, * 25.2 versions before 25.2R2-EVO.
This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 5.3, indicating it requires adjacent network access but requires specific conditions to be met without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 15 products from juniper, from juniper, from juniper and 12 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.
2026-07-09T22:17:08.453
2026-10-25T15:10:00.147
Analyzed
CVSSv3.1: 5.3 (MEDIUM)
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| 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 | 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 | 24.2 | 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 | 24.2 | 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 |
| 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 |
| Operating System | juniper | junos_os_evolved | 24.4 | Yes |
| Operating System | juniper | junos_os_evolved | 25.2 | Yes |
| Operating System | juniper | junos_os_evolved | 25.2 | Yes |
| Operating System | juniper | junos_os_evolved | 25.2 | Yes |
| Operating System | juniper | junos_os_evolved | 25.2 | Yes |
| 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.