Microsoft Exchange 2013 CU23 SU21 · Version Status
Microsoft Exchange 2013 CU23 SU21 End of Life Date
Microsoft Exchange 2013 CU23 SU21 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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Microsoft Exchange 2013 CU23 SU21 is past end of life. This version no longer receives security patches. 1306 days past EOL — migrate to a supported version immediately.
EOL Date
Apr 11, 2023
1306 days past EOL
Latest Release
15.0.1497.48
Standard release
Release Date
Jan 9, 2013
Microsoft Exchange 2013 CU23 SU21 series
Where these dates come from
End of lifeApr 11, 2023Vendor's own page, read by our adapter · learn.microsoft.com · checked Nov 3, 2026high · 3 sources agree End of active supportApr 10, 2018Vendor's own page, read by our adapter · learn.microsoft.com · checked Nov 3, 2026high · 3 sources agree ReleaseJan 9, 2013Vendor's own page, read by our adapter · learn.microsoft.com · checked Nov 3, 2026high · 3 sources agree Confidence: high = two or more independent sources agree (the vendor's page read by our adapter, a person's check against the vendor, the dataset the date came from); medium = one; low = the vendor page disagrees or our last read is stale.
How we source dates.
Lifecycle detail
Microsoft Exchange 2013 was released on January 9, 2013 and support ended on April 11, 2023 — a supported lifespan of 10 years and 3 months, in line with the 10 years and 1 month median for Microsoft Exchange releases. Its latest release on record is 15.0.1497.48, published March 14, 2023 — 28 days before support ended. It has been past its end-of-life date for 3 years and 7 months. 1 newer Microsoft Exchange release has shipped since.
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 Microsoft Exchange 2013 CU23 SU21 support options
Some vendors and third parties sell security patches beyond end of life; whether one covers this version varies. Compare your options.
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All Microsoft Exchange Versions
What does Microsoft Exchange 2013 CU23 SU21 end of life mean?
When Microsoft Exchange 2013 CU23 SU21 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: A CVE-based scan does not show the ongoing accumulation of unpatched vulnerabilities in EOL software versions. Some scanners flag unsupported versions of common products, but coverage varies, and none of them give you the date in advance. Running Microsoft Exchange 2013 CU23 SU21 past its EOL date creates a growing attack surface that a clean scan result does not rule out.
Migrate to Microsoft Exchange Subscription Edition SU11 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does Microsoft Exchange 2013 CU23 SU21 reach end of life?
Microsoft Exchange 2013 CU23 SU21 reached end of life on April 11, 2023. This version is no longer receiving security patches.
Is Microsoft Exchange 2013 CU23 SU21 still supported?
No. Microsoft Exchange 2013 CU23 SU21 reached end of life on April 11, 2023 and is no longer receiving security patches.
What should I upgrade to from Microsoft Exchange 2013 CU23 SU21?
The recommended upgrade from Microsoft Exchange 2013 CU23 SU21 is
Microsoft Exchange Subscription Edition SU11 — the latest actively supported version. Check the
Microsoft Exchange full timeline for all supported versions.
What are the security risks of running Microsoft Exchange 2013 CU23 SU21 past EOL?
Since Microsoft Exchange 2013 CU23 SU21 reached end of life, the maintainers no longer issue security patches. Any CVEs disclosed after the EOL date accumulate with no vendor fix. A CVE-based scan does not show this — it is the CVE blind spot; some scanners flag unsupported versions of common products, but coverage varies and none give the date in advance. Organizations running EOL Microsoft Exchange should migrate immediately or implement compensating controls.