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CVE-2024-49040 is a spoofing vulnerability in Microsoft Exchange Server 2016 and 2019 caused by improper verification of the P2 FROM email header during mail transport. The vulnerable implementation allows certain non-RFC 5322-compliant P2 FROM header formats to pass validation, which can cause mail clients such as Outlook to display a forged sender address as legitimate. The issue affects incoming messages to local recipients and enables an unauthenticated remote attacker to craft email messages in which the displayed sender identity differs from the actual sender context processed by Exchange.
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No public exploit code observed for this vulnerability.
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8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Exchange Server spoofing vulnerability caused by improper P2 FROM header processing, allowing attackers to craft emails that appear to come from a legitimate sender address in the victim’s interface.
A spoofing vulnerability in Microsoft Exchange Server 2016 and 2019 caused by improper handling of non-RFC5322-compliant P2 FROM headers, allowing forged sender information to appear legitimate in email clients.
High-severity Microsoft Exchange Server spoofing vulnerability caused by improper validation of the P2 FROM email header; PoC exploit code is available.
A Microsoft Exchange Server spoofing vulnerability considered more likely by Microsoft to be exploited within 30 days.
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.