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CVE-2021-28480 is a critical remote code execution vulnerability in on-premises Microsoft Exchange Server. It was disclosed as part of the April 2021 Exchange security updates and affects supported Exchange Server 2013, 2016, and 2019 update branches. Available reporting identifies it as one of two Exchange flaws in that release that are remotely exploitable without authentication and require no user interaction. The vulnerability is associated with network-reachable Exchange functionality and was characterized as potentially wormable between Exchange servers. Specific root-cause details, vulnerable function names, and a confirmed exploitation path for CVE-2021-28480 are not available from the provided information.
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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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A pre-auth Microsoft Exchange vulnerability discussed as part of patch diffing and backend cookie parsing analysis, potentially related to backend routing or SSRF-style behavior.
A remote code execution vulnerability affecting Microsoft Exchange Server.
An unauthenticated, network-reachable remote code execution vulnerability in on-prem Microsoft Exchange Server; described as likely wormable between Exchange servers.
An unauthenticated, network-reachable remote code execution vulnerability in on-prem Microsoft Exchange Server; described as likely wormable between Exchange servers.
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.