SonicWall Email Security appliances ES 300 · Version Status
SonicWall Email Security appliances ES 300 End of Life Date
SonicWall Email Security appliances ES 300 end-of-life date, support status, and CVE risk. Data reconciled from official vendor documentation and endoflife.date at every build; the source of each date is on the product page.
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SonicWall Email Security appliances ES 300 is past end of life. This version no longer receives security patches. 3418 days past EOL — migrate to a supported version immediately.
EOL Date
May 1, 2017
3418 days past EOL
Latest Release
ES 300
Standard release
Release Date
—
SonicWall Email Security appliances ES 300 series
Lifecycle detail
It has been without security patches for 9 years and 4 months.
Attack Surface
10/30 Medium tier
CISA KEV Exposure
0/20 Not in KEV
Extended Support
0/10 Available
EOL Risk Score™ — proprietary methodology by endoflife.ai. Factors: EOL recency, attack surface breadth, CISA KEV catalog presence, extended support availability. Updated at every build.
Methodology → ·
View score card →
Extended Support
Extended SonicWall Email Security appliances ES 300 support is available
Commercial vendors offer security patches beyond EOL. Compare your options.
Compare Options →
All SonicWall Email Security appliances Versions
| Version | Latest | EOL Date | Status |
|---|
| ES 8000 |
ES 8000 |
Apr 10, 2014 |
EOL |
| ES 400 |
ES 400 |
Jan 1, 2015 |
EOL |
| ES 200 |
ES 200 |
Jan 1, 2015 |
EOL |
| ES 6000 |
ES 6000 |
May 1, 2016 |
EOL |
| ES 500 |
ES 500 |
May 1, 2016 |
EOL |
| → ES 300 |
ES 300 |
May 1, 2017 |
EOL |
| ES 8300 |
ES 8300 |
Apr 1, 2020 |
EOL |
| ES 4300 |
ES 4300 |
Apr 1, 2020 |
EOL |
What does SonicWall Email Security appliances ES 300 end of life mean?
When SonicWall Email Security appliances ES 300 reaches end of life, the maintainers stop issuing security patches for this version. CVEs discovered after the EOL date are publicly disclosed on the National Vulnerability Database with no patch available. Exploit code frequently appears on GitHub within days of disclosure.
The CVE blind spot: Most vulnerability scanners check for known CVEs but do not flag the ongoing accumulation of unpatched vulnerabilities in EOL software versions. Running SonicWall Email Security appliances ES 300 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.
Migrate to SonicWall Email Security appliances ES 5000 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does SonicWall Email Security appliances ES 300 reach end of life?
SonicWall Email Security appliances ES 300 reached end of life on May 1, 2017. This version is no longer receiving security patches.
Is SonicWall Email Security appliances ES 300 still supported?
No. SonicWall Email Security appliances ES 300 reached end of life on May 1, 2017 and is no longer receiving security patches.
What should I upgrade to from SonicWall Email Security appliances ES 300?
The recommended upgrade from SonicWall Email Security appliances ES 300 is
SonicWall Email Security appliances ES 5000 — the latest actively supported version. Check the
SonicWall Email Security appliances full timeline for all supported versions.
What are the security risks of running SonicWall Email Security appliances ES 300 past EOL?
When SonicWall Email Security appliances ES 300 reaches end of life, the maintainers stop issuing security patches. Any CVEs disclosed after the EOL date accumulate with no remediation path. Most vulnerability scanners do not flag this — it is the CVE blind spot. Organizations running EOL SonicWall Email Security appliances should migrate immediately or implement compensating controls.