Junos OS and Junos OS Evolved: A high frequency of connecting and disconnecting NETCONF sessions causes management unavailability (Juniper Networks Junos OS)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.23 % · percentile 14 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- juniper
- NVD status
- Analyzed
Description
An Incorrect Synchronization vulnerability in the management daemon (mgd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based attacker with low privileges to cause a complete Denial-of-Service (DoS) of the management plane. When NETCONF sessions are quickly established and disconnected, a locking issue causes mgd processes to hang in an unusable state. When the maximum number of mgd processes has been reached, no new logins are possible. This leads to the inability to manage the device and requires a power-cycle to recover. This issue can be monitored by checking for mgd processes in lockf state in the output of 'show system processes extensive': user@host> show system processes extensive | match mgd <pid> root 20 0 501M 4640K lockf 1 0:01 0.00% mgd If the system still can be accessed (either via the CLI or as root, which might still be possible as last resort as this won't invoke mgd), mgd processes in this state can be killed with 'request system process terminate <PID>' from the CLI or with 'kill -9 <PID>' from the shell. This issue affects: Junos OS: * 23.4 versions before 23.4R2-S4, * 24.2 versions before 24.2R2-S1, * 24.4 versions before 24.4R1-S3, 24.4R2; This issue does not affect Junos OS versions before 23.4R1; Junos OS Evolved: * 23.4 versions before 23.4R2-S5-EVO, * 24.2 versions before 24.2R2-S1-EVO, * 24.4 versions before 24.4R1-S3-EVO, 24.4R2-EVO. This issue does not affect Junos OS Evolved versions before 23.4R1-EVO;
Weaknesses (CWE)
- CWE-821 — Incorrect Synchronization
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | juniper |
| CVSS 4.0 | HIGH 7.1 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/AU:Y/R:U/RE:M | juniper |
| CVSS 4.0 | HIGH 7.1 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:X/RE:M/U:X | NVD · sirt@juniper.net (Secondary) |
| CVSS 3.1 | MEDIUM 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | NVD · sirt@juniper.net (Secondary) |
European references
- ENISA EUVD · EUVD-2026-21082
- GCVE · GCVE-0-2026-21919
CERT-FR advisories
- CERTFR-2026-AVI-0408 — Multiples vulnérabilités dans les produits Juniper Networks · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:juniper:junos:23.4:-:*:*:*:*:*:*cpe:2.3:o:juniper:junos:23.4:r1:*:*:*:*:*:*cpe:2.3:o:juniper:junos:23.4:r1-s1:*:*:*:*:*:*cpe:2.3:o:juniper:junos:23.4:r1-s2:*:*:*:*:*:*cpe:2.3:o:juniper:junos:23.4:r2:*:*:*:*:*:*cpe:2.3:o:juniper:junos:23.4:r2-s1:*:*:*:*:*:*cpe:2.3:o:juniper:junos:23.4:r2-s2:*:*:*:*:*:*cpe:2.3:o:juniper:junos:23.4:r2-s3:*:*:*:*:*:*cpe:2.3:o:juniper:junos:24.2:-:*:*:*:*:*:*cpe:2.3:o:juniper:junos:24.2:r1:*:*:*:*:*:*cpe:2.3:o:juniper:junos:24.2:r1-s1:*:*:*:*:*:*cpe:2.3:o:juniper:junos:24.2:r1-s2:*:*:*:*:*:*cpe:2.3:o:juniper:junos:24.2:r2:*:*:*:*:*:*cpe:2.3:o:juniper:junos:24.4:-:*:*:*:*:*:*cpe:2.3:o:juniper:junos:24.4:r1:*:*:*:*:*:*cpe:2.3:o:juniper:junos:24.4:r1-s2:*:*:*:*:*:*cpe:2.3:o:juniper:junos:24.4:r2:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:23.4:-:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:23.4:r1:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:23.4:r1-s1:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:23.4:r1-s2:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:23.4:r2:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s1:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s2:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s3:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:23.4:r2-s4:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:24.2:-:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:24.2:r1:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:24.2:r1-s2:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:24.2:r2:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:24.4:-:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:24.4:r1:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:24.4:r1-s2:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:24.4:r2:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| Juniper Networks · Junos OS | affected 23.4 < 23.4R2-S4 ; affected 24.2 < 24.2R2-S1 ; affected 24.4 < 24.4R1-S3, 24.4R2 ; unaffected all version prior to < 23.4R1 |
| Juniper Networks · Junos OS Evolved | affected 23.4 < 23.4R2-S5-EVO ; affected 24.2 < 24.2R2-S1-EVO ; affected 24.4 < 24.4R1-S3-EVO, 24.4R2-EVO ; unaffected all version prior to < 23.4R1-EVO |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |