Junos OS Evolved 12.3X50
12.3X50-EVO
Os Release
· Junos OS Evolved Series
Is Junos OS Evolved 12.3X50 still maintained?
No. Juniper no longer maintains Junos OS Evolved 12.3X50; support ended 2016-07-31. It receives no fixes of any kind, including security patches. Devices running it are unpatched against any newer vulnerability — plan an upgrade to a maintained release. See Juniper's lifecycle bulletin.
When do security fixes for Junos OS Evolved 12.3X50 stop?
Engineering fixes for Junos OS Evolved 12.3X50 — including security patches — stop on 2016-01-31. After that date, a device on this release cannot be patched against newly disclosed vulnerabilities without upgrading, which is the point that matters for KEV exposure and compliance.
What should I upgrade Junos OS Evolved 12.3X50 to?
Upgrade to a currently maintained Juniper release. Check the release-train table on the vendor page for the nearest supported version.
What known-exploited CVEs apply to the Junos OS Evolved 12.3X50 past end of support?
7 CVEs in CISA's Known Exploited Vulnerabilities catalog affect Juniper Junos. Because Junos OS Evolved 12.3X50 is past end of engineering, it will not receive fixes for them — a device left on this release is exploitable with no patch available. Upgrade to a maintained release. See the Known Exploited Vulnerabilities table below for the full list.
Known Exploited Vulnerabilities
This device is past Juniper's security-support date. 7 CVEs in CISA's Known Exploited Vulnerabilities catalog apply to the platform it runs. Juniper is not issuing patches for this model. Isolate, compensate, or refresh.
| CVE | KEV added | Vulnerability | Flags |
|---|---|---|---|
CVE-2025-21590
|
Juniper Junos OS Improper Isolation or Compartmentalization Vulnerability | ||
CVE-2023-36844
|
Juniper Junos OS EX Series PHP External Variable Modification Vulnerability | ||
CVE-2023-36845
|
Juniper Junos OS EX Series and SRX Series PHP External Variable Modification Vulnerability | ||
CVE-2023-36846
|
Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability | ||
CVE-2023-36847
|
Juniper Junos OS EX Series Missing Authentication for Critical Function Vulnerability | ||
CVE-2023-36851
|
Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability | ||
CVE-2020-1631
|
Juniper Junos OS Path Traversal Vulnerability |
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. 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.
Junos OS Evolved 12.3X50 Release Lifecycle
Junos OS Evolved 12.3X50 is a Juniper Junos OS Evolved 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 Junos OS Evolved 12.3X50 should plan a migration .
Lifecycle Milestones
| Lifecycle notice published | 13y 7mo ago | |
|---|---|---|
| End of software maintenance | 10y 6mo ago | |
| End of security vulnerability support | 10y 6mo ago | |
| Last date of support | 9y 12mo ago |