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CVE-2026-21525 is a local denial-of-service vulnerability in Microsoft Windows Remote Access Connection Manager (RasMan). The flaw is caused by a null pointer dereference in the service during processing associated with remote access connection handling and negotiation. Available reporting indicates the vulnerable code path is in RasMan and may involve rascustom.dll or related modules. By supplying crafted local input or malformed data that reaches the vulnerable path, an unauthorized attacker can trigger a service crash. Microsoft classified the issue as a NULL pointer dereference vulnerability affecting multiple supported Windows client and server versions, and exploitation was detected in the wild at the time of disclosure.
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What an attacker gets, and what they’ve been doing with it.
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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.
55 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A locally exploitable denial of service vulnerability in Windows Remote Access Connection Manager that can disrupt VPN connectivity relying on that component.
A denial-of-service vulnerability in Windows Remote Access Connection Manager caused by a null pointer dereference, allowing an unauthenticated attacker to trigger a local DoS condition.
Unknown (listed as a trending Microsoft Windows CVE without details in the provided content).
A denial-of-service vulnerability in Windows Remote Access Connection Manager (RasMan) that can knock critical Windows networking services offline via a simple local trigger.
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.