Junos OS and Junos OS Evolved: Use after free vulnerability In 802.1X authentication daemon can cause crash of the dot1xd process (Juniper Networks Junos OS)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.31 % · percentile 24 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- juniper
- NVD status
- Analyzed
Description
A Use After Free vulnerability was identified in the 802.1X authentication daemon (dot1xd) of Juniper Networks Junos OS and Junos OS Evolved that could allow an authenticated, network-adjacent attacker flapping a port to crash the dot1xd process, leading to a Denial of Service (DoS), or potentially execute arbitrary code within the context of the process running as root. The issue is specific to the processing of a change in authorization (CoA) when a port bounce occurs. A pointer is freed but was then referenced later in the same code path. Successful exploitation is outside the attacker's direct control due to the specific timing of the two events required to execute the vulnerable code path. This issue affects systems with 802.1X authentication port-based network access control (PNAC) enabled. This issue affects: Junos OS: * from 23.2R2-S1 before 23.2R2-S5, * from 23.4R2 before 23.4R2-S6, * from 24.2 before 24.2R2-S3, * from 24.4 before 24.4R2-S1, * from 25.2 before 25.2R1-S2, 25.2R2; Junos OS Evolved: * from 23.2R2-S1 before 23.2R2-S5-EVO, * from 23.4R2 before 23.4R2-S6-EVO, * from 24.2 before 24.2R2-S3-EVO, * from 24.4 before 24.4R2-S1-EVO, * from 25.2 before 25.2R1-S2-EVO, 25.2R2-EVO.
Weaknesses (CWE)
- CWE-416 — Use After Free
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.1 | CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H | juniper |
| CVSS 4.0 | HIGH 7.5 | CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/RE:M/U:Green | juniper |
| CVSS 4.0 | HIGH 7.5 | CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/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:X/R:X/V:X/RE:M/U:Green | NVD · sirt@juniper.net (Secondary) |
| CVSS 3.1 | HIGH 7.1 | CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · sirt@juniper.net (Secondary) |
European references
- ENISA EUVD · EUVD-2026-2690
- GCVE · GCVE-0-2026-21908
CERT-FR advisories
- CERTFR-2026-AVI-0050 — Multiples vulnérabilités dans les produits Juniper Networks · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:juniper:junos:23.2:r2-s1:*:*:*:*:*:*cpe:2.3:o:juniper:junos:23.2:r2-s2:*:*:*:*:*:*cpe:2.3:o:juniper:junos:23.2:r2-s3:*:*:*:*:*:*cpe:2.3:o:juniper:junos:23.2:r2-s4:*:*:*:*:*:*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:23.4:r2-s4:*:*:*:*:*:*cpe:2.3:o:juniper:junos:23.4:r2-s5:*:*:*:*:*:*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:24.2:r2-s1:*:*:*:*:*:*cpe:2.3:o:juniper:junos:24.2:r2-s2:*:*:*:*:*:*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:r1-s3:*:*:*:*:*:*cpe:2.3:o:juniper:junos:24.4:r2:*:*:*:*:*:*cpe:2.3:o:juniper:junos:25.2:-:*:*:*:*:*:*cpe:2.3:o:juniper:junos:25.2:r1:*:*:*:*:*:*cpe:2.3:o:juniper:junos:25.2:r1-s1:*:*:*:*:*:*cpe:2.3:o:juniper:junos:25.2:r2:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:23.2:r2-s1:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:23.2:r2-s2:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:23.2:r2-s3:*:*:*:*:*:*cpe:2.3:o:juniper:junos_os_evolved:23.2:r2-s4:*:*:*:*:*:*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:23.4:r2-s5:*:*:*:*:*:*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:*:*:*:*:*:*- +11 more
Affected products
| Product | Versions |
|---|---|
| Juniper Networks · Junos OS | affected 23.2R2-S1 < 23.2R2-S5 ; affected 23.4R2 < 23.4R2-S6 ; affected 24.2 < 24.2R2-S3 ; affected 24.4 < 24.4R2-S1 ; affected 25.2 < 25.2R1-S2, 25.2R2 |
| Juniper Networks · Junos OS Evolved | affected 23.2R2-S1 < 23.2R2-S5-EVO ; affected 23.4R2 < 23.4R2-S6-EVO ; affected 24.2 < 24.2R2-S3-EVO ; affected 24.4 < 24.4R2-S1-EVO ; affected 25.2 < 25.2R1-S2-EVO, 25.2R2-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 |