{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2025-40833/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":7.5,"id":"CVE-2025-40833"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":[],"_cs_severities":["medium"],"_cs_tags":["dos","cve-2025-40833"],"_cs_type":"advisory","_cs_vendors":["Siemens AG"],"content_html":"\u003cp\u003eCVE-2025-40833 describes a null pointer dereference vulnerability affecting certain devices. The vulnerability is triggered when processing specially crafted IPv4 requests. An unauthenticated, remote attacker can exploit this flaw to cause a denial-of-service (DoS) condition on the affected device. Successful exploitation requires a manual restart of the device to restore functionality. Siemens AG reported this vulnerability. The affected product list is not specified in the NVD or Siemens advisory.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker identifies a target device that is vulnerable to CVE-2025-40833.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious IPv4 request specifically designed to trigger the null pointer dereference.\u003c/li\u003e\n\u003cli\u003eThe attacker sends the crafted IPv4 request to the targeted device.\u003c/li\u003e\n\u003cli\u003eThe vulnerable code within the device attempts to process the malicious IPv4 request.\u003c/li\u003e\n\u003cli\u003eDue to the crafted nature of the request, a null pointer is dereferenced during processing.\u003c/li\u003e\n\u003cli\u003eThis null pointer dereference causes the device to crash or become unresponsive.\u003c/li\u003e\n\u003cli\u003eThe device enters a denial-of-service (DoS) state.\u003c/li\u003e\n\u003cli\u003eSystem administrators must manually restart the device to restore normal operation.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2025-40833 results in a denial-of-service condition. This can disrupt critical services provided by the affected device. The device becomes unresponsive, requiring a manual restart to recover. The specific number of affected devices and the sectors they belong to are unknown.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eIdentify potentially vulnerable assets by cross-referencing internal asset lists with the Siemens security advisory linked in the references.\u003c/li\u003e\n\u003cli\u003eMonitor network traffic for suspicious or malformed IPv4 requests targeting potentially vulnerable devices. Deploy the Sigma rule provided to detect potential exploitation attempts.\u003c/li\u003e\n\u003cli\u003eInvestigate and validate the patch provided by Siemens as detailed in the reference link to remediate the vulnerability.\u003c/li\u003e\n\u003cli\u003eConsider implementing rate limiting on IPv4 traffic to potentially mitigate the impact of a DoS attack.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-12T10:18:59Z","date_published":"2026-05-12T10:18:59Z","id":"https://feed.craftedsignal.io/briefs/2026-05-cve-2025-40833-dos/","summary":"A null pointer dereference vulnerability exists in affected devices while processing specially crafted IPv4 requests, potentially allowing a remote attacker to cause a denial of service, requiring a manual restart to recover the system.","title":"CVE-2025-40833 Null Pointer Dereference in Affected Devices Leads to Denial of Service","url":"https://feed.craftedsignal.io/briefs/2026-05-cve-2025-40833-dos/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2025-40833","version":"https://jsonfeed.org/version/1.1"}