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Recorded 2 Nov 2026 at 16:27 UTC. This is what ChangeIntel recorded, including the title, summary, facts and links. It is not a statement of the source's current position. See the latest record.

The historical field “Public exploit code” recorded Nuclei detection-template membership. It did not establish exploit availability. The original recorded fields remain below.

CVECISA Known Exploited Vulnerabilities

Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.

What it said

CVE
CVE-2021-26855
Vendor
Microsoft
Product
Exchange Server
CISA KEV
Listed 3 Nov 2021
Known ransomware use
Yes
Federal remediation due
3 May 2022
Public detection template
Nuclei template listed
Public exploit code
Nuclei template listed

Source evidence when recorded

CISA KEV
Complete at observationRead 2 Nov 2026 at 16:25 UTC
Public detection templates (Nuclei)
IncompleteRead 2 Nov 2026 at 15:22 UTC

Coverage describes the sources at this observation. A complete read then does not establish their current position.

What changed

  1. Detection template: Nuclei template listed
  2. Detection template: Nuclei template listed
Page history

Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.

Cite this version
Field-level log (7)

Up to 100 recent field edits are shown; older edits may be outside retention.

  1. 2 Nov 2026 · 16:27:39 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  2. 29 Oct 2026 · 20:19:26 UTC Public detection templateNuclei template listed
  3. 28 Oct 2026 · 05:10:29 UTC Public exploit codeNuclei template listed
  4. 28 Oct 2026 · 05:10:29 UTC Source coverage: public-exploit-codeCurrent
  5. 28 Oct 2026 · 05:10:29 UTC Link: Nuclei templatehttps://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-26855.yaml
  6. 23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
  7. 23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete
ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 14 Nov 23:34 UTC · 274 of 275 readable · 272 fully read · documentation 469/469 current

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