{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/azure-virtual-network-gateway/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":9.9,"id":"CVE-2026-40411"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Azure Virtual Network Gateway"],"_cs_severities":["critical"],"_cs_tags":["azure","rce","vulnerability"],"_cs_type":"advisory","_cs_vendors":["Microsoft"],"content_html":"\u003cp\u003eCVE-2026-40411 is a critical vulnerability affecting Azure Virtual Network Gateway. This vulnerability stems from improper input validation, which enables an authorized attacker to execute arbitrary code over the network. The vulnerability has a CVSS v3.1 base score of 9.9, highlighting its significant risk. Exploitation could lead to a full compromise of the affected network gateway and potentially other connected resources. Defenders should prioritize patching and implementing appropriate input validation measures to mitigate this threat. This vulnerability was disclosed by Microsoft on May 22, 2026.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker authenticates to Azure with compromised or legitimate credentials.\u003c/li\u003e\n\u003cli\u003eAttacker crafts a malicious network configuration payload containing shell metacharacters.\u003c/li\u003e\n\u003cli\u003eAttacker sends a request to update the Azure Virtual Network Gateway configuration via the Azure API.\u003c/li\u003e\n\u003cli\u003eThe Azure Virtual Network Gateway receives the configuration update request with the malicious payload.\u003c/li\u003e\n\u003cli\u003eDue to improper input validation, the gateway processes the malicious payload without sanitization.\u003c/li\u003e\n\u003cli\u003eThe shell metacharacters within the payload trigger command execution on the underlying system.\u003c/li\u003e\n\u003cli\u003eThe attacker gains arbitrary code execution within the Azure Virtual Network Gateway.\u003c/li\u003e\n\u003cli\u003eAttacker leverages the compromised gateway to pivot and compromise other resources on the network.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-40411 allows an authorized attacker to execute arbitrary code on the Azure Virtual Network Gateway. This can lead to complete compromise of the gateway, allowing the attacker to intercept and manipulate network traffic, pivot to other connected resources, and potentially exfiltrate sensitive data. Given the critical role of VPN gateways in network security, a successful attack can have widespread and severe consequences.\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-2026-40411 on all Azure Virtual Network Gateway instances immediately, as referenced in the advisory URL.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule \u003ccode\u003eDetect CVE-2026-40411 Exploitation Attempt — Malicious Azure VNet Gateway Configuration\u003c/code\u003e to detect attempts to inject malicious code via configuration updates.\u003c/li\u003e\n\u003cli\u003eReview and harden input validation mechanisms within Azure Virtual Network Gateway configurations.\u003c/li\u003e\n\u003cli\u003eMonitor Azure API logs for suspicious configuration changes related to network gateways using the \u003ccode\u003eDetect Suspicious Azure API Activity\u003c/code\u003e Sigma rule.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-26T13:53:35Z","date_published":"2026-05-26T13:53:35Z","id":"https://feed.craftedsignal.io/briefs/2026-05-azure-vnet-rce/","summary":"CVE-2026-40411 describes an improper input validation vulnerability in Azure Virtual Network Gateway that allows an authorized attacker to execute code over a network.","title":"CVE-2026-40411: Azure Virtual Network Gateway Improper Input Validation RCE","url":"https://feed.craftedsignal.io/briefs/2026-05-azure-vnet-rce/"}],"language":"en","title":"CraftedSignal Threat Feed — Azure Virtual Network Gateway","version":"https://jsonfeed.org/version/1.1"}