{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-27917/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":7,"id":"CVE-2026-27917"}],"_cs_exploited":true,"_cs_products":[],"_cs_severities":["high"],"_cs_tags":["cve-2026-27917","use-after-free","privilege-escalation","windows"],"_cs_type":"threat","_cs_vendors":[],"content_html":"\u003cp\u003eCVE-2026-27917 is a use-after-free vulnerability affecting the Windows WFP NDIS Lightweight Filter Driver (wfplwfs.sys). This vulnerability allows an attacker with local access and authorization to elevate their privileges on the system. The vulnerability arises from improper memory management within the driver, leading to a situation where a freed memory region is accessed again. The specific timeframe of exploitation in the wild is unknown, but the vulnerability was publicly disclosed on April 14, 2026. Successful exploitation could lead to complete system compromise for the attacker. Defenders should prioritize patching systems to mitigate this vulnerability.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker gains initial local access to the target system, potentially through social engineering or by exploiting another vulnerability.\u003c/li\u003e\n\u003cli\u003eThe attacker leverages their existing privileges to interact with the Windows Filtering Platform (WFP).\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a specific request or operation that triggers the use-after-free condition within the wfplwfs.sys driver.\u003c/li\u003e\n\u003cli\u003eThe driver attempts to access the freed memory region, leading to memory corruption.\u003c/li\u003e\n\u003cli\u003eThe attacker manipulates the memory to overwrite critical system data structures.\u003c/li\u003e\n\u003cli\u003eThe attacker triggers a system call or operation that utilizes the corrupted data.\u003c/li\u003e\n\u003cli\u003eDue to the overwritten data, the system grants elevated privileges to the attacker.\u003c/li\u003e\n\u003cli\u003eThe attacker now has elevated privileges and can perform actions such as installing software, modifying data, and creating new accounts.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-27917 allows a local attacker to gain elevated privileges on a Windows system. This can lead to a complete compromise of the system, including data theft, malware installation, and further propagation of attacks within the network. While the number of victims and affected sectors is unknown, the high severity of the vulnerability warrants immediate attention from system administrators and security teams. A successful exploit grants the attacker full control over the compromised system.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply the patch provided by Microsoft for CVE-2026-27917 as soon as possible to mitigate the use-after-free vulnerability in wfplwfs.sys (\u003ca href=\"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27917)\"\u003ehttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27917)\u003c/a\u003e.\u003c/li\u003e\n\u003cli\u003eMonitor for suspicious process creation events associated with wfplwfs.sys using process creation logs to detect potential exploitation attempts. Deploy the provided Sigma rules to your SIEM and tune them for your environment.\u003c/li\u003e\n\u003cli\u003eImplement least privilege principles to limit the impact of a successful exploit by restricting user access rights.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-15T12:00:00Z","date_published":"2026-04-15T12:00:00Z","id":"/briefs/2026-04-cve-2026-27917/","summary":"CVE-2026-27917 is a use-after-free vulnerability in the Windows WFP NDIS Lightweight Filter Driver (wfplwfs.sys) that allows a locally authorized attacker to elevate privileges.","title":"CVE-2026-27917: Windows WFP NDIS Lightweight Filter Driver Use-After-Free Vulnerability","url":"https://feed.craftedsignal.io/briefs/2026-04-cve-2026-27917/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2026-27917","version":"https://jsonfeed.org/version/1.1"}