CVE-2025-21589
published 2026-01-27CVE-2025-21589: An Authentication Bypass Using an Alternate Path or Channel vulnerability in Juniper Networks Session Smart Router may allows a network-based attacker to…
PriorityP271critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
1.43%
69.8th percentile
An Authentication Bypass Using an Alternate Path or Channel vulnerability in Juniper Networks Session Smart Router may allows a network-based attacker to bypass authentication and take administrative control of the device. This issue affects Session Smart Router: * from 5.6.7 before 5.6.17, * from 6.0 before 6.0.8 (affected from 6.0.8), * from 6.1 before 6.1.12-lts, * from 6.2 before 6.2.8-lts, * from 6.3 before 6.3.3-r2; This issue affects Session Smart Conductor: * from 5.6.7 before 5.6.17, * from 6.0 before 6.0.8 (affected from 6.0.8), * from 6.1 before 6.1.12-lts, * from 6.2 before 6.2.8-lts, * from 6.3 before 6.3.3-r2; This issue affects WAN Assurance Managed Routers: * from 5.6.7 before 5.6.17, * from 6.0 before 6.0.8 (affected from 6.0.8), * from 6.1 before 6.1.12-lts, * from 6.2 before 6.2.8-lts, * from 6.3 before 6.3.3-r2.
Affected
12 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| juniper_networks | session_smart_conductor | >= 5.6.7 < 5.6.17 | 5.6.17 |
| juniper_networks | session_smart_conductor | >= 6.1 < 6.1.12-lts | 6.1.12-lts |
| juniper_networks | session_smart_conductor | >= 6.2 < 6.2.8-lts | 6.2.8-lts |
| juniper_networks | session_smart_conductor | >= 6.3 < 6.3.3-r2 | 6.3.3-r2 |
| juniper_networks | session_smart_router | >= 5.6.7 < 5.6.17 | 5.6.17 |
| juniper_networks | session_smart_router | >= 6.1 < 6.1.12-lts | 6.1.12-lts |
| juniper_networks | session_smart_router | >= 6.2 < 6.2.8-lts | 6.2.8-lts |
| juniper_networks | session_smart_router | >= 6.3 < 6.3.3-r2 | 6.3.3-r2 |
| juniper_networks | wan_assurance_managed_router | >= 5.6.7 < 5.6.17 | 5.6.17 |
| juniper_networks | wan_assurance_managed_router | >= 6.1 < 6.1.12-lts | 6.1.12-lts |
| juniper_networks | wan_assurance_managed_router | >= 6.2 < 6.2.8-lts | 6.2.8-lts |
| juniper_networks | wan_assurance_managed_router | >= 6.3 < 6.3.3-r2 | 6.3.3-r2 |
Detection & IOCsextracted from sources · hover to see the quote
- →Detect network-based authentication bypass attempts targeting Juniper Session Smart Router administrative interface — look for unauthenticated sessions gaining administrative control over the device management plane. ↗
- ·No evidence of in-the-wild exploitation has been confirmed by Juniper SIRT at time of advisory publication; however, Juniper devices are historically targeted within days of patch release. ↗
- ·Some WAN Assurance Managed Routers connected to the Mist Cloud have already been automatically patched; verify patch status before assuming all cloud-managed devices are still vulnerable. ↗
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvdv4.09.3CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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:X/R:X/V:X/RE:X/U:X
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Juniper
CVE-2025-21589: An Authentication Bypass Using an
Alternate Path or Channel vulnerability in Juniper Networks Session Smart
Router may allows a network-based attacker
vendor_juniper·2026-01-27·CVSS 9.8
CVE-2025-21589 [CRITICAL] CWE-288 CVE-2025-21589: An Authentication Bypass Using an
Alternate Path or Channel vulnerability in Juniper Networks Session Smart
Router may allows a network-based attacker
CVE-2025-21589: An Authentication Bypass Using an
Alternate Path or Channel vulnerability in Juniper Networks Session Smart
Router may allows a network-based attacker to bypass authentication
and take administrative control of the device.
This issue affects Session Smart Router:
* from 5.6.7 before 5.6.17,
* from 6.0 before 6.0.8 (affected from 6.0.8),
* from 6.1 before 6.1.12-lts,
* from 6.2 before 6.2.8-lts,
* from 6.3 before 6.3.3-r2;
This issue affects Session Smart Conductor:
* from 5.6.7 before 5.6.17,
* from 6.0 before 6.0.8 (affected from 6.0.8),
* from 6.1 before 6.1.12-lts,
* from 6.2 before 6.2.8-lts,
* from 6.3 before 6.3.3-r2;
This issue affects WAN Assurance Managed Routers:
* from 5.6.7 before 5.6.17,
* from 6.0 before 6.0.8 (affected from 6.0.8),
* from 6.1 be
GHSA
GHSA-vjjg-c428-g9r3: An Authentication Bypass Using an
Alternate Path or Channel vulnerability in Juniper Networks Session Smart
Router may allows a network-based attacker
ghsa_unreviewed·2026-01-27
CVE-2025-21589 [CRITICAL] CWE-288 GHSA-vjjg-c428-g9r3: An Authentication Bypass Using an
Alternate Path or Channel vulnerability in Juniper Networks Session Smart
Router may allows a network-based attacker
An Authentication Bypass Using an
Alternate Path or Channel vulnerability in Juniper Networks Session Smart
Router may allows a network-based attacker to bypass authentication
and take administrative control of the device.
This issue affects Session Smart Router:
* from 5.6.7 before 5.6.17,
* from 6.0 before 6.0.8 (affected from 6.0.8),
* from 6.1 before 6.1.12-lts,
* from 6.2 before 6.2.8-lts,
* from 6.3 before 6.3.3-r2;
This issue affects Session Smart Conductor:
* from 5.6.7 before 5.6.17,
* from 6.0 before 6.0.8 (affected from 6.0.8),
* from 6.1 before 6.1.12-lts,
* from 6.2 before 6.2.8-lts,
* from 6.3 before 6.3.3-r2;
This issue affects WAN Assurance Managed Routers:
* from 5.6.7 before 5.6.17,
* from 6.0 before 6.0.8 (affected from 6.0.8),
* from 6.1 before 6.1.12-lts,
No detection rules found.
No public exploits indexed.
2026-01-27
Published