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Vulnerabilities

Vulnerability · CVE-2026-70571

Affected Microsoft products: Microsoft Exchange Server Subscription Edition RTM, Microsoft Exchange Server 2019 Cumulative Update 15, Microsoft Exchange Server 2019 Cu…

Published Oct 13, 2026 · catalog updated Oct 13, 2026 · Microsoft Exchange

Check if you run it

No confirmed exploitation is on record for CVE-2026-70571. EPSS is 0.93%. Act only if a listed version of Microsoft Exchange is installed.

Severity
High8.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.93%
Remediation
Advisory link
Affected products
microsoft Microsoft Exchange Server 2016 Cumulative Update 23 · microsoft Microsoft Exchange Server 2019 Cumulative Update 14 · microsoft Microsoft Exchange Server 2019 Cumulative Update 15 · microsoft Microsoft Exchange Server Subscription Edition RTM

Affected Microsoft products: Microsoft Exchange Server Subscription Edition RTM, Microsoft Exchange Server 2019 Cumulative Update 15, Microsoft Exchange Server 2019 Cumulative Update 14, Microsoft Exchange Server 2016 Cumulative Update 23.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • microsoft Microsoft Exchange Server 2016 Cumulative Update 23version unspecified
  • microsoft Microsoft Exchange Server 2019 Cumulative Update 14version unspecified
  • microsoft Microsoft Exchange Server 2019 Cumulative Update 15version unspecified
  • microsoft Microsoft Exchange Server Subscription Edition RTMversion unspecified

How to fix CVE-2026-70571

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-70571. EPSS is 0.93%. Act only if a listed version of Microsoft Exchange is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-121: Stack-based Buffer Overflow. EPSS 0.93%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Cisco security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · Microsoft Security Update Guide

    Detected

    Affected Microsoft products: Microsoft Exchange Server Subscription Edition RTM, Microsoft Exchange Server 2019 Cumulative Update 15, Microsoft Exchange Server 2019 Cumulative Update 14, Microsoft Exchange Server 2016 Cumulative Update 23.

Sources

  • CVE.orgVulnerability recordCVE-2026-70571

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-70571

    30-day exploitation probability 0.9%

    first.org
  • Microsoft Security Update GuideVendor advisoryCVE-2026-70571

    Microsoft Exchange Server Subscription Edition RTM, Microsoft Exchange Server 2019 Cumulative Update 15, Microsoft Exchange Server 2019 Cumulative Update 14, Microsoft Exchange Server 2016 Cumulative Update 23

    msrc.microsoft.com
  • Cisco TalosVendor advisoryCVE-2026-70571

    Microsoft has released its monthly security update for October 2026, which includes 1415 vulnerabilities affecting a range of products, including 85 that Microsoft marked as "critical."

    blog.talosintelligence.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.