Junos OS Evolved: QFX Series: When sFlow collector reachability changes evo-pfemand process can crash
Priority LOW 26CWE-820Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0019 8th percentileScored 2026-11-07
Fix Fixed Junos OS Evolved (Juniper Networks): 23.4R2-S7-EVO, 24.2R2-S5-EVO, 24.4R2-S3-EVO +1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Juniper | Junos OS Evolved | before 23.4R2-S7-EVO; 24.2 to before 24.2R2-S5-EVO; 24.4 to before 24.4R2-S3-EVO; 25.2 to before 25.2R2-EVO | 23.4R2-S7-EVO, 24.2R2-S5-EVO, 24.4R2-S3-EVO, 25.2R2-EVO | Patch available | CNA |
- Junos OS Evolved VendorJuniper Affected before 23.4R2-S7-EVO; 24.2 to before 24.2R2-S5-EVO; 24.4 to before 24.4R2-S3-EVO; 25.2 to before 25.2R2-EVO Fixed in 23.4R2-S7-EVO, 24.2R2-S5-EVO, 24.4R2-S3-EVO, 25.2R2-EVO Patch available CNA
CPE configurations NVD · 45
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:juniper:junos_os_evolved:23.2:*:*:*:*:*:*:* | 23.2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:23.4:-:*:*:*:*:*:* | 23.4 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:23.4:r1:*:*:*:*:*:* | 23.4 r1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:23.4:r1-s1:*:*:*:*:*:* | 23.4 r1-s1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:23.4:r1-s2:*:*:*:*:*:* | 23.4 r1-s2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:23.4:r2:*:*:*:*:*:* | 23.4 r2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s1:*:*:*:*:*:* | 23.4 r2-s1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s2:*:*:*:*:*:* | 23.4 r2-s2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s3:*:*:*:*:*:* | 23.4 r2-s3 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s4:*:*:*:*:*:* | 23.4 r2-s4 | Vulnerable | Juniper |
- cpe:2.3:o:juniper:junos_os_evolved:23.2:*:*:*:*:*:*:* Versions 23.2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:23.4:-:*:*:*:*:*:* Versions 23.4 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:23.4:r1:*:*:*:*:*:* Versions 23.4 r1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:23.4:r1-s1:*:*:*:*:*:* Versions 23.4 r1-s1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:23.4:r1-s2:*:*:*:*:*:* Versions 23.4 r1-s2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:23.4:r2:*:*:*:*:*:* Versions 23.4 r2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s1:*:*:*:*:*:* Versions 23.4 r2-s1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s2:*:*:*:*:*:* Versions 23.4 r2-s2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s3:*:*:*:*:*:* Versions 23.4 r2-s3 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s4:*:*:*:*:*:* Versions 23.4 r2-s4 Vulnerable ·Juniper
Show 35 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s5:*:*:*:*:*:* | 23.4 r2-s5 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s6:*:*:*:*:*:* | 23.4 r2-s6 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:24.2:-:*:*:*:*:*:* | 24.2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:24.2:r1:*:*:*:*:*:* | 24.2 r1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:24.2:r1-s2:*:*:*:*:*:* | 24.2 r1-s2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:24.2:r2:*:*:*:*:*:* | 24.2 r2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:24.2:r2-s1:*:*:*:*:*:* | 24.2 r2-s1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:24.2:r2-s2:*:*:*:*:*:* | 24.2 r2-s2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:24.2:r2-s3:*:*:*:*:*:* | 24.2 r2-s3 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:24.2:r2-s4:*:*:*:*:*:* | 24.2 r2-s4 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:24.4:-:*:*:*:*:*:* | 24.4 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:24.4:r1:*:*:*:*:*:* | 24.4 r1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:24.4:r1-s2:*:*:*:*:*:* | 24.4 r1-s2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:24.4:r1-s3:*:*:*:*:*:* | 24.4 r1-s3 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:24.4:r2:*:*:*:*:*:* | 24.4 r2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:24.4:r2-s1:*:*:*:*:*:* | 24.4 r2-s1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:24.4:r2-s2:*:*:*:*:*:* | 24.4 r2-s2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:25.2:-:*:*:*:*:*:* | 25.2 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:25.2:r1:*:*:*:*:*:* | 25.2 r1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:25.2:r1-s1:*:*:*:*:*:* | 25.2 r1-s1 | Vulnerable | Juniper |
| cpe:2.3:o:juniper:junos_os_evolved:25.2:r1-s2:*:*:*:*:*:* | 25.2 r1-s2 | Vulnerable | Juniper |
| cpe:2.3:h:juniper:qfx10008:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:qfx10016:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:qfx5110:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:qfx5120:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:qfx5130:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:qfx5140:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:qfx5200:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:qfx5210:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:qfx5220:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:qfx5230-64cd:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:qfx5240:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:qfx5241:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:qfx5250:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
| cpe:2.3:h:juniper:qfx5700:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Juniper |
- cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s5:*:*:*:*:*:* Versions 23.4 r2-s5 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s6:*:*:*:*:*:* Versions 23.4 r2-s6 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:24.2:-:*:*:*:*:*:* Versions 24.2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:24.2:r1:*:*:*:*:*:* Versions 24.2 r1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:24.2:r1-s2:*:*:*:*:*:* Versions 24.2 r1-s2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:24.2:r2:*:*:*:*:*:* Versions 24.2 r2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:24.2:r2-s1:*:*:*:*:*:* Versions 24.2 r2-s1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:24.2:r2-s2:*:*:*:*:*:* Versions 24.2 r2-s2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:24.2:r2-s3:*:*:*:*:*:* Versions 24.2 r2-s3 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:24.2:r2-s4:*:*:*:*:*:* Versions 24.2 r2-s4 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:24.4:-:*:*:*:*:*:* Versions 24.4 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:24.4:r1:*:*:*:*:*:* Versions 24.4 r1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:24.4:r1-s2:*:*:*:*:*:* Versions 24.4 r1-s2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:24.4:r1-s3:*:*:*:*:*:* Versions 24.4 r1-s3 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:24.4:r2:*:*:*:*:*:* Versions 24.4 r2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:24.4:r2-s1:*:*:*:*:*:* Versions 24.4 r2-s1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:24.4:r2-s2:*:*:*:*:*:* Versions 24.4 r2-s2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:25.2:-:*:*:*:*:*:* Versions 25.2 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:25.2:r1:*:*:*:*:*:* Versions 25.2 r1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:25.2:r1-s1:*:*:*:*:*:* Versions 25.2 r1-s1 Vulnerable ·Juniper
- cpe:2.3:o:juniper:junos_os_evolved:25.2:r1-s2:*:*:*:*:*:* Versions 25.2 r1-s2 Vulnerable ·Juniper
- cpe:2.3:h:juniper:qfx10008:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:qfx10016:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:qfx5110:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:qfx5120:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:qfx5130:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:qfx5140:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:qfx5200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:qfx5210:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:qfx5220:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:qfx5230-64cd:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:qfx5240:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:qfx5241:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:qfx5250:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
- cpe:2.3:h:juniper:qfx5700:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Juniper
Remediation
- Fix · CNA Junos OS Evolved (Juniper Networks) Fixed in 23.4R2-S7-EVO, 24.2R2-S5-EVO, 24.4R2-S3-EVO, 25.2R2-EVO
Timeline
- 2026-10-02 Threatist record created from CVE-2026-57029
- 2026-10-03 Alias added: GHSA-x7gh-cpmx-x9cj
References
More Juniper Junos Os Evolved vulnerabilities
- TI-2026-17602 Junos OS Evolved: PTX Series: A vulnerability allows a unauthenticated, network-based attacker to execute code as root CVSS 4.0CRITICAL 9.3
- TI-2026-17601 Junos OS and Junos OS Evolved: Configuration of a specific SSH option results in mgd crash CVSS 4.0MEDIUM 6.7
- TI-2023-04136 Improper input validation in Juniper Junos OS CVSS 3.1HIGH 7.5
- TI-2026-74215 Stack-based buffer overflow in Junos OS rpd triggered by BGP peers CVSS 4.0CRITICAL 9.3
- TI-2026-74211 Authentication bypass in Juniper J-Web allows pre-auth CGI execution CVSS 4.0CRITICAL 9.3
- TI-2021-00146 Junos OS and Junos OS Evolved: Upon receipt of a specific BGP FlowSpec message network traffic may be disrupted. CVSS 3.1CRITICAL 10.0
Sources
- CVE-2026-57029 · CVE Program
- CVE-2026-57029 · NVD
- FIRST EPSS
- GHSA-x7gh-cpmx-x9cj · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences