Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsCheck every on-premises Exchange server’s installed version and build against Microsoft’s security-update guidance, then separately investigate whether it may have been compromised before it was patched. A patched build answers the first question—not the second. Microsoft’s Test-ProxyLogon.ps1 can help identify possible attacker activity in Exchange and IIS logs, but neither a clean script result nor a matching log entry is conclusive by itself.
What these checks can—and cannot—tell you
There are two different questions to answer:
- Is the server vulnerable now? Determine its exact Exchange version and build, then compare that build with Microsoft’s applicable security-update guidance. A working or reachable server is not necessarily patched.
- Was the server exploited earlier? Examine logs and other evidence for possible attacker activity. Patching a vulnerable server does not establish that it was never compromised.
Microsoft’s March 2021 ProxyLogon guidance concerned on-premises Exchange vulnerabilities CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, and CVE-2021-27065. The campaign was attributed to HAFNIUM, but a finding on an individual server does not by itself identify the actor. Attribution requires incident-specific analysis. See Microsoft’s HAFNIUM threat report and related guidance.
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1. Inventory every on-premises Exchange server
Check servers individually; do not assume they all run the same release or update level. Record the server name, Exchange version, installed cumulative update and build, security update level, internet exposure or reverse-proxy placement, and whether the organization is covered by Microsoft’s Extended Security Update (ESU) program.
Use Microsoft’s Exchange build numbers and release dates documentation to identify what a reported build corresponds to. Then use the relevant Microsoft security update guidance for that specific release to verify whether the applicable fixes are installed. Keep the build and update details in your records rather than relying on a general “patched” status.
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2. Check the current update and support status
Compare each server’s recorded build with Microsoft’s current release and security-update guidance for that Exchange version. The operative question is whether that installed build includes the relevant security fixes, not whether a server is associated with a campaign name.
As of the research date, Microsoft’s supportability matrix lists Exchange Server Subscription Edition RTM as supported and shows that Exchange Server 2016 and 2019 reached end of support on October 14, 2025. Microsoft’s build guidance says enrolled ESU customers are eligible for December 2025 and later security updates for Exchange 2016 and 2019; organizations not enrolled should migrate to Exchange Server Subscription Edition to continue receiving security updates. Confirm current ESU eligibility and Microsoft’s update instructions before taking action, because support and update guidance can change.
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3. Look for evidence of earlier attacker activity
Run Microsoft’s investigation script
Microsoft recommends running Test-ProxyLogon.ps1 as administrator to analyze Exchange and IIS logs for possible attacker activity. If the script detects activity, Microsoft’s responder guidance says it reports vulnerability evidence and collects logs in the Test-ProxyLogonLogs output directory. Review those results as part of a broader investigation, not as a standalone verdict. If an investigation lasts multiple days, Microsoft recommends downloading the script again at least daily because it may be updated.
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Review Exchange HttpProxy logs
Microsoft identifies Exchange HttpProxy logs as useful for hunting CVE-2021-26855 activity. The logs are typically under %PROGRAMFILES%MicrosoftExchange ServerV15LoggingHttpProxy. One indicator described in Microsoft’s HAFNIUM guidance is an empty AuthenticatedUser alongside an AnchorMailbox matching ServerInfo~*/*.
Treat that pattern as a clue to correlate with other requests, logs, and endpoint evidence. A single matching line does not prove successful compromise.
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Correlate the evidence
Include IIS and Exchange logs, endpoint-protection or EDR findings, suspicious files such as web shells, and signs of post-compromise activity. If requests passed through a reverse proxy, its logs may help interpret client addresses and traffic. Microsoft’s responder guidance describes investigation and remediation beyond a single scan.
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4. Interpret findings and respond appropriately
If the script reports nothing suspicious
A “Nothing suspicious detected” result does not prove that the server was never compromised. Continue investigating if the server was vulnerable while exposed, relevant logs are missing or incomplete, endpoint alerts exist, or other activity appears suspicious. Preserve the logs and script output so they remain available for analysis.
If you find suspicious activity
Investigate possible persistence, credential access, lateral movement, and other activity after the initial compromise. If your organization lacks the capability to conduct that work, involve a qualified incident-response team. A positive indicator warrants investigation; it does not by itself establish that HAFNIUM was responsible.
If the server is still vulnerable
Apply the security update that Microsoft specifies for the server’s release and follow its current support guidance. Historical workarounds, including disabling selected virtual directories, were temporary mitigations with functional trade-offs—not guaranteed full protection or substitutes for installing the applicable update. Microsoft states in its mitigation guidance that mitigations are not remediation for a server that has already been compromised and do not evict an adversary.
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