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CVE-2024-21410 is a critical elevation-of-privilege vulnerability affecting Microsoft Exchange Server. Successful exploitation allows a remote, unauthenticated attacker to obtain NTLM authentication material from a targeted user and relay the leaked Net-NTLMv2 hash to a susceptible Exchange Server, authenticating as that user. The issue is described as an NTLM credential leakage and relay scenario rather than direct memory corruption or classic remote code execution. Microsoft guidance indicates the attack can involve targeting an NTLM client such as Outlook to trigger credential leakage, after which the attacker relays the authentication exchange to Exchange and performs actions in the victim’s security context. Microsoft later updated the advisory to indicate exploitation had been detected in the wild. Extended Protection for Authentication is identified as the key defensive control that addresses this vulnerability on supported Exchange versions.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability referenced only as part of examples of suspicious and likely fraudulent GitHub PoC repositories.
Critical elevation of privilege vulnerability in Microsoft Exchange Server that allows an unauthenticated remote attacker to capture NTLM authentication material and relay a leaked Net-NTLMv2 hash to authenticate as a legitimate user.
An Exchange Server vulnerability referenced as lacking a patch for Exchange 2016 at the time, requiring advisory guidance/mitigation to address exposure.
A security vulnerability affecting Microsoft Exchange Server that Microsoft indicates can be addressed/mitigated by enabling Windows Extended Protection (EP) (enabled by default in Exchange Server 2019 CU14).
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.