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CVE-2025-21376 is a critical remote code execution vulnerability in the Windows Lightweight Directory Access Protocol (LDAP) component. Available reporting describes the issue as a buffer overflow reachable through specially crafted LDAP calls sent by a remote, unauthenticated attacker. Exploitation appears to depend on winning a race condition in the LDAP service by manipulating the timing of interleaved LDAP requests so that multiple worker threads access a shared request context concurrently. Reported technical effects include an integer underflow followed by a heap overflow, which can potentially be leveraged to corrupt adjacent memory and redirect execution flow. The vulnerability has also been characterized as wormable because successful compromise of one system could enable follow-on attacks against other reachable systems.
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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.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
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.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical Windows LDAP remote code execution vulnerability with CVSS 8.1 that Microsoft assesses as more likely to be exploited within 30 days.
A critical remote code execution vulnerability in Windows LDAP reachable by specially crafted LDAP calls from a remote unauthenticated attacker.
Wormable remote code execution buffer overflow in Windows LDAP, enabling compromise and potential lateral propagation.
A remote code execution vulnerability in Windows LDAP.
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.