Sophos Firewall 18.5 MR4 · Version Status
Sophos Firewall 18.5 MR4 End of Life Date
Sophos Firewall 18.5 MR4 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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Sophos Firewall 18.5 MR4 is past end of life. This version no longer receives security patches. 1167 days past EOL — migrate to a supported version immediately.
EOL Date
Jun 30, 2023
1167 days past EOL
Latest Release
18.5 MR4
Standard release
Release Date
—
Sophos Firewall 18.5 MR4 series
Lifecycle detail
It has been without security patches for 3 years and 2 months.
Attack Surface
10/30 Medium tier
CISA KEV Exposure
20/20 Named in CISA 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 Sophos Firewall 18.5 MR4 support is available
Commercial vendors offer security patches beyond EOL. Compare your options.
Compare Options →
All Sophos Firewall Versions
| Version | Latest | EOL Date | Status |
|---|
| 15 |
15 |
Mar 1, 2018 |
EOL |
| 16 |
16 |
Aug 20, 2019 |
EOL |
| 17 |
17 |
Aug 31, 2020 |
EOL |
| 17.0 MR10 |
17.0 MR10 |
Apr 30, 2024 |
EOL |
| 17.5 |
17.5 |
Nov 30, 2021 |
EOL |
| 18.0 |
18.0 |
Jul 31, 2022 |
EOL |
| 18.5 GA-MR3 |
18.5 GA-MR3 |
Dec 7, 2022 |
EOL |
| → 18.5 MR4 |
18.5 MR4 |
Jun 30, 2023 |
EOL |
What does Sophos Firewall 18.5 MR4 end of life mean?
When Sophos Firewall 18.5 MR4 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 Sophos Firewall 18.5 MR4 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.
Migrate to Sophos Firewall 22.0 MR2 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does Sophos Firewall 18.5 MR4 reach end of life?
Sophos Firewall 18.5 MR4 reached end of life on June 30, 2023. This version is no longer receiving security patches.
Is Sophos Firewall 18.5 MR4 still supported?
No. Sophos Firewall 18.5 MR4 reached end of life on June 30, 2023 and is no longer receiving security patches.
What should I upgrade to from Sophos Firewall 18.5 MR4?
The recommended upgrade from Sophos Firewall 18.5 MR4 is
Sophos Firewall 22.0 MR2 — the latest actively supported version. Check the
Sophos Firewall full timeline for all supported versions.
What are the security risks of running Sophos Firewall 18.5 MR4 past EOL?
When Sophos Firewall 18.5 MR4 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 Sophos Firewall should migrate immediately or implement compensating controls.