WX OS 5.1
WX-OS-5.1Juniper · OS release · WX OS Series
Unsupported since · 6923 days ago
WX OS 5.1 reached end of support on (6923 days ago).
- Notice published
- 21y 6mo ago
- End of software maintenance
- 19y 12mo ago
- End of security support
- 19y 12mo ago
- End of support
- 18y 12mo ago
Lifecycle Milestones
| Lifecycle notice published | 21y 6mo ago | |
|---|---|---|
| End of software maintenance | 19y 12mo ago | |
| End of security vulnerability support | 19y 12mo ago | |
| Last date of support | 18y 12mo ago |
Known Exploited Vulnerabilities
7 CVEs in CISA's Known Exploited Vulnerabilities catalog are recorded against the Juniper platform this release belongs to and may apply to this release; verify against the vendor advisory before acting. Juniper security vulnerability support for this release stopped on . Where one applies, upgrade, isolate, or compensate.
| CVE | KEV added | Vulnerability | Flags |
|---|---|---|---|
CVE-2025-21590
|
Juniper Junos OS Improper Isolation or Compartmentalization Vulnerability
KEV added 2025-03-13
|
||
CVE-2023-36844
|
Juniper Junos OS EX Series PHP External Variable Modification Vulnerability
KEV added 2023-11-13
|
||
CVE-2023-36845
|
Juniper Junos OS EX Series and SRX Series PHP External Variable Modification Vulnerability
KEV added 2023-11-13
|
||
CVE-2023-36846
|
Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability
KEV added 2023-11-13
|
||
CVE-2023-36847
|
Juniper Junos OS EX Series Missing Authentication for Critical Function Vulnerability
KEV added 2023-11-13
|
||
CVE-2023-36851
|
Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability
KEV added 2023-11-13
|
||
CVE-2020-1631
|
Juniper Junos OS Path Traversal Vulnerability
KEV added 2022-03-25
|
Source: CISA Known Exploited Vulnerabilities catalog. The Ransomware flag reflects CISA's own knownRansomwareCampaignUse field, set when the CVE has been observed in ransomware campaigns per their threat intel. It's not a property of the vulnerability description itself.
Correlation is at the platform level, not per-OS-version (entries disclosed well before this release train shipped are left out). Not exhaustive: KEV only lists actively-exploited CVEs and many relevant unexploited vulnerabilities are not here. Verify against vendor security advisories (PSIRT, JSA, PAN-SA) and NVD before acting. See compensating controls if refresh isn't immediate.
Is WX OS 5.1 still maintained?
No. Juniper no longer maintains WX OS 5.1; support ended on 2007-11-27. It receives no fixes of any kind, including security patches. Plan an upgrade to a maintained release. See Juniper's lifecycle bulletin.
When do security fixes for WX OS 5.1 stop?
Juniper stopped engineering fixes for WX OS 5.1, including security patches, on 2006-11-27. A device on this release cannot be patched against vulnerabilities disclosed after that date without upgrading.
What should I upgrade WX OS 5.1 to?
Upgrade to a currently maintained Juniper release. Check Juniper's release notes for the recommended version.
Which known-exploited CVEs may apply to the WX OS 5.1?
7 CVEs in CISA's Known Exploited Vulnerabilities catalog are recorded against Juniper WX OS and may apply to WX OS 5.1, whose security fixes stopped on 2006-11-27. Verify each against the vendor advisory for the fixed releases before acting. See the Known Exploited Vulnerabilities table for the full list.
WX OS 5.1 Release Lifecycle
WX OS 5.1 is a Juniper WX OS software release. Releases are maintained on a fixed schedule: Juniper ships fixes and security patches until the release reaches end of engineering, after which a device must be upgraded to a maintained release to stay patchable. The dates below are milestones for the software train, not for any specific appliance — hardware running this release has its own separate lifecycle. This product has reached end of life as of , meaning Juniper no longer provides technical support, software updates, or hardware replacement for this product. Organizations still running the WX OS 5.1 should plan a migration .