{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/big-ip-tmos/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":7.9,"id":"CVE-2026-41217"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["BIG-IP TMOS"],"_cs_severities":["high"],"_cs_tags":["cve","privilege-escalation","command-injection","f5"],"_cs_type":"advisory","_cs_vendors":["F5 Networks"],"content_html":"\u003cp\u003eCVE-2026-41217 describes a command injection vulnerability affecting F5 BIG-IP devices. The vulnerability exists within an unspecified command in the TMOS Shell (tmsh). An attacker who has already gained authenticated access with either resource administrator or administrator privileges can leverage this flaw to execute arbitrary system commands. Successful exploitation could lead to privilege escalation and, in Appliance mode deployments, a breach of the security boundary, potentially allowing for unauthorized access and control over the affected system. This vulnerability was published on May 13, 2026. It is important to note that software versions that have reached End of Technical Support (EoTS) are not evaluated for this vulnerability.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn attacker gains initial authenticated access to the BIG-IP TMOS Shell (tmsh) with resource administrator or administrator privileges.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious command containing shell metacharacters or command injection payloads.\u003c/li\u003e\n\u003cli\u003eThe attacker executes the crafted command via the vulnerable, undisclosed tmsh command.\u003c/li\u003e\n\u003cli\u003eThe vulnerable tmsh command processes the attacker-supplied input without proper sanitization or validation.\u003c/li\u003e\n\u003cli\u003eThe injected shell metacharacters are interpreted by the underlying operating system.\u003c/li\u003e\n\u003cli\u003eThe system executes the injected arbitrary commands with elevated privileges.\u003c/li\u003e\n\u003cli\u003eIn Appliance mode deployments, the attacker bypasses security restrictions.\u003c/li\u003e\n\u003cli\u003eThe attacker achieves arbitrary command execution with higher privileges, potentially leading to full system compromise or data exfiltration.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-41217 allows an attacker to execute arbitrary system commands with elevated privileges on a vulnerable F5 BIG-IP system. In Appliance mode deployments, this can lead to a security boundary breach. This can result in full system compromise, data exfiltration, or the deployment of malicious payloads. Organizations using affected versions of F5 BIG-IP are at risk of unauthorized access and control of their network infrastructure.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply the security patch or upgrade to a fixed version of F5 BIG-IP TMOS as detailed in the F5 Networks advisory [https://my.f5.com/manage/s/article/K000161107].\u003c/li\u003e\n\u003cli\u003eImplement strict access control policies and regularly review user privileges on BIG-IP systems to minimize the potential attack surface.\u003c/li\u003e\n\u003cli\u003eMonitor BIG-IP systems for suspicious command execution patterns or unauthorized access attempts using existing security tools and logs.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule \u003ccode\u003eDetect CVE-2026-41217 Exploitation Attempt - TMOS Shell Command Injection\u003c/code\u003e to detect potential exploitation attempts based on command execution patterns.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-13T16:24:01Z","date_published":"2026-05-13T16:24:01Z","id":"https://feed.craftedsignal.io/briefs/2026-05-cve-2026-41217-bigip-privesc/","summary":"CVE-2026-41217 is a vulnerability in an undisclosed F5 BIG-IP TMOS Shell (tmsh) command that allows an authenticated attacker with resource administrator or administrator role to execute arbitrary system commands with higher privileges, potentially crossing a security boundary in Appliance mode deployments.","title":"CVE-2026-41217: F5 BIG-IP TMOS Shell (tmsh) Command Injection Vulnerability","url":"https://feed.craftedsignal.io/briefs/2026-05-cve-2026-41217-bigip-privesc/"}],"language":"en","title":"CraftedSignal Threat Feed — BIG-IP TMOS","version":"https://jsonfeed.org/version/1.1"}