Spoofing in Microsoft Exchange Server UI
CVE-2025-64667 is a spoofing vulnerability in Microsoft Exchange Server caused by user interface misrepresentation of critical information. According to the provided content, the flaw allows critical information presented by the Exchange Server UI to be misrepresented, enabling an unauthorized attacker to conduct spoofing over a network. No additional technical details about the specific vulnerable component, code path, or function were provided in the source material.
Are you exposed to this one?
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A spoofing vulnerability in Microsoft Exchange Server that allows network-based spoofing. Rated Important, exploitation is considered less likely, but could be critical when chained with other vulnerabilities.
Specific Microsoft vulnerability affecting Microsoft Exchange Server listed in the December 2025 Security Updates.
A Microsoft December 2025 security update vulnerability affecting Microsoft Exchange Server.
The version that knows your environment.
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.