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CVE-2021-33768 is an elevation-of-privilege vulnerability in Microsoft Exchange Server Frontend handling of NTLM authentication. An attacker can coerce an Exchange server to authenticate using its machine account and relay that authentication across hosts to the Frontend service of another Exchange server. Exchange machine accounts normally possess the ms-Exch-EPI-Token-Serialization extended right, allowing the relayed identity to impersonate Exchange users in applicable services. Microsoft corrected the issue by preventing machine-account logons in the Frontend proxy handler.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Exchange Front End NTLM-relay vulnerability enabling an attacker to relay an Exchange server machine account authentication to another Exchange Front End and impersonate arbitrary users through services such as EWS.
A Microsoft Exchange vulnerability listed by the researchers as part of the broader Exchange attack surface they identified.
A Microsoft Exchange Server vulnerability included in the research timeline; no technical details are provided in the content.
Microsoft Exchange Server elevation of privilege vulnerability addressed in the July updates.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.