SonicOS 6.5.4.15 and Older 6.x versions
SonicOS-6.5.4.15-and-older-6.x
Os Release
· SonicOS Series
Is SonicOS 6.5.4.15 and Older 6.x versions still maintained?
No. SonicWall no longer maintains SonicOS 6.5.4.15 and Older 6.x versions; support ended 2025-02-04. 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 SonicWall's lifecycle bulletin.
When do security fixes for SonicOS 6.5.4.15 and Older 6.x versions stop?
SonicWall has not published an end-of-engineering date for SonicOS 6.5.4.15 and Older 6.x versions.
What should I upgrade SonicOS 6.5.4.15 and Older 6.x versions to?
Upgrade to a currently maintained SonicWall release. Check the release-train table on the vendor page for the nearest supported version.
What known-exploited CVEs apply to the SonicOS 6.5.4.15 and Older 6.x versions past end of support?
2 CVEs in CISA's Known Exploited Vulnerabilities catalog affect SonicWall SonicOS. Because SonicOS 6.5.4.15 and Older 6.x versions 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 SonicWall's security-support date. 2 CVEs in CISA's Known Exploited Vulnerabilities catalog apply to the platform it runs. SonicWall is not issuing patches for this model. Isolate, compensate, or refresh.
| CVE | KEV added | Vulnerability | Flags |
|---|---|---|---|
CVE-2024-40766
|
SonicWall SonicOS Improper Access Control Vulnerability | Ransomware | |
CVE-2020-5135
|
SonicWall SonicOS Buffer Overflow Vulnerability | Ransomware |
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.
SonicOS 6.5.4.15 and Older 6.x versions Release Lifecycle
SonicOS 6.5.4.15 and Older 6.x versions is a SonicWall SonicOS software release. Releases are maintained on a fixed schedule: SonicWall 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 SonicWall no longer provides technical support, software updates, or hardware replacement for this product. Organizations still running the SonicOS 6.5.4.15 and Older 6.x versions should plan a migration .
Lifecycle Milestones
| Last date of support | 1y 9mo ago |
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Additional Dates
| General Availability Date | 3y 2mo ago |
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