{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/null-pointer-dereference/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":7.4,"id":"CVE-2026-40413"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Windows TCP/IP"],"_cs_severities":["medium"],"_cs_tags":["cve","dos","denial of service","null pointer dereference"],"_cs_type":"threat","_cs_vendors":["Microsoft"],"content_html":"\u003cp\u003eCVE-2026-40413 is a security vulnerability affecting Windows TCP/IP. The vulnerability, a null pointer dereference, allows an unauthorized attacker within an adjacent network to trigger a denial-of-service (DoS) condition. This vulnerability was published on May 12, 2026, and has a CVSS v3.1 score of 7.4. Exploitation of this vulnerability could disrupt network services and impact the availability of affected Windows systems. Defenders should apply the patch released by Microsoft to mitigate the risk.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker gains access to a network adjacent to the target Windows system.\u003c/li\u003e\n\u003cli\u003eThe attacker sends a specially crafted TCP/IP packet to the target system.\u003c/li\u003e\n\u003cli\u003eThe Windows TCP/IP stack attempts to process the malicious packet.\u003c/li\u003e\n\u003cli\u003eDuring packet processing, a null pointer is dereferenced due to the crafted packet\u0026rsquo;s structure.\u003c/li\u003e\n\u003cli\u003eThe null pointer dereference causes the TCP/IP service to crash.\u003c/li\u003e\n\u003cli\u003eThe crashed TCP/IP service leads to a denial-of-service condition, preventing legitimate network communication.\u003c/li\u003e\n\u003cli\u003eThe target system becomes unresponsive to network requests.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-40413 leads to a denial-of-service condition on the targeted Windows system. This can disrupt network services, impacting availability and potentially causing data loss or corruption if critical processes are interrupted. The vulnerability can be exploited by an attacker on an adjacent network, increasing the risk in environments with shared network infrastructure.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply the security update provided by Microsoft to patch CVE-2026-40413 as referenced in the advisory URL.\u003c/li\u003e\n\u003cli\u003eMonitor network traffic for anomalous TCP/IP packets originating from adjacent networks using the Sigma rule \u0026ldquo;Detect CVE-2026-40413 Exploitation Attempt — Suspicious TCP Packet\u0026rdquo;.\u003c/li\u003e\n\u003cli\u003eEnable network intrusion detection systems to identify and block potentially malicious TCP/IP packets.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-12T18:48:39Z","date_published":"2026-05-12T18:48:39Z","id":"https://feed.craftedsignal.io/briefs/2026-05-cve-2026-40413/","summary":"CVE-2026-40413 is a null pointer dereference vulnerability in Windows TCP/IP that allows an unauthenticated attacker on an adjacent network to cause a denial-of-service condition.","title":"CVE-2026-40413: Windows TCP/IP Null Pointer Dereference Denial of Service","url":"https://feed.craftedsignal.io/briefs/2026-05-cve-2026-40413/"},{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":7.1,"id":"CVE-2026-40401"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Windows TCP/IP"],"_cs_severities":["medium"],"_cs_tags":["cve","denial-of-service","windows","null pointer dereference"],"_cs_type":"threat","_cs_vendors":["Microsoft"],"content_html":"\u003cp\u003eCVE-2026-40401 is a vulnerability affecting Windows TCP/IP, stemming from a null pointer dereference. This flaw allows an unauthorized, local attacker to trigger a denial-of-service (DoS) condition on the targeted system. The vulnerability was published by Microsoft and assigned a CVSS v3.1 base score of 7.1. An attacker leveraging this vulnerability could potentially disrupt network services and impact the availability of the system. The vulnerability requires local access and does not need user interaction to trigger the denial of service.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker gains local access to the targeted Windows system.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a specific TCP/IP packet or network request.\u003c/li\u003e\n\u003cli\u003eThe crafted packet triggers a null pointer dereference within the Windows TCP/IP stack.\u003c/li\u003e\n\u003cli\u003eThe null pointer dereference causes the TCP/IP service to crash.\u003c/li\u003e\n\u003cli\u003eThe crash disrupts network connectivity and related services.\u003c/li\u003e\n\u003cli\u003eThe system experiences a denial-of-service condition, impacting availability.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-40401 can lead to a denial-of-service condition on the targeted Windows system. This disruption impacts network services, potentially affecting other applications and users relying on network connectivity. The impact is limited to local denial of service.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply the security update provided by Microsoft to patch CVE-2026-40401 as soon as possible (\u003ca href=\"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40401)\"\u003ehttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40401)\u003c/a\u003e.\u003c/li\u003e\n\u003cli\u003eMonitor systems for unexpected TCP/IP service crashes using the provided Sigma rules.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-12T18:46:52Z","date_published":"2026-05-12T18:46:52Z","id":"https://feed.craftedsignal.io/briefs/2026-05-cve-2026-40401/","summary":"CVE-2026-40401 is a null pointer dereference vulnerability in Windows TCP/IP that allows a local, unauthorized attacker to cause a denial of service.","title":"CVE-2026-40401 - Windows TCP/IP Null Pointer Dereference Denial of Service","url":"https://feed.craftedsignal.io/briefs/2026-05-cve-2026-40401/"}],"language":"en","title":"CraftedSignal Threat Feed — Null Pointer Dereference","version":"https://jsonfeed.org/version/1.1"}