{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/iptime-a8004t-14.18.2/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":8.8,"id":"CVE-2026-8234"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["ipTIME A8004T 14.18.2"],"_cs_severities":["high"],"_cs_tags":["cve","buffer overflow","router","rce"],"_cs_type":"threat","_cs_vendors":["EFM"],"content_html":"\u003cp\u003eA stack-based buffer overflow vulnerability, identified as CVE-2026-8234, has been discovered in EFM ipTIME A8004T version 14.18.2. The vulnerability resides within the \u003ccode\u003eformWifiBasicSet\u003c/code\u003e function in the \u003ccode\u003e/goform/WifiBasicSet\u003c/code\u003e file. By manipulating the \u003ccode\u003esecurity_5g\u003c/code\u003e argument, a remote attacker can trigger a buffer overflow, potentially leading to arbitrary code execution. This vulnerability was publicly disclosed, and an exploit is available. The vendor was notified but did not respond. This issue poses a significant risk to users of the affected device, as it can be exploited remotely without requiring authentication after successful exploitation.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker identifies an EFM ipTIME A8004T router running firmware version 14.18.2 with the vulnerable \u003ccode\u003eformWifiBasicSet\u003c/code\u003e function.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious HTTP request targeting the \u003ccode\u003e/goform/WifiBasicSet\u003c/code\u003e endpoint.\u003c/li\u003e\n\u003cli\u003eWithin the HTTP request, the attacker includes a specially crafted \u003ccode\u003esecurity_5g\u003c/code\u003e argument designed to overflow the buffer allocated in the \u003ccode\u003eformWifiBasicSet\u003c/code\u003e function.\u003c/li\u003e\n\u003cli\u003eThe router processes the HTTP request and calls the \u003ccode\u003eformWifiBasicSet\u003c/code\u003e function with the attacker-controlled \u003ccode\u003esecurity_5g\u003c/code\u003e argument.\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003eformWifiBasicSet\u003c/code\u003e function copies the attacker-supplied data from the \u003ccode\u003esecurity_5g\u003c/code\u003e argument into a fixed-size buffer on the stack without proper bounds checking.\u003c/li\u003e\n\u003cli\u003eThe copied data exceeds the buffer\u0026rsquo;s capacity, overwriting adjacent memory regions on the stack.\u003c/li\u003e\n\u003cli\u003eThe attacker carefully crafts the overflow to overwrite the return address on the stack with the address of malicious code.\u003c/li\u003e\n\u003cli\u003eWhen the \u003ccode\u003eformWifiBasicSet\u003c/code\u003e function returns, it jumps to the attacker-controlled address, executing arbitrary code on the router.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-8234 allows a remote attacker to execute arbitrary code on the affected EFM ipTIME A8004T router. This could lead to complete compromise of the device, including the ability to intercept network traffic, modify router settings, or use the device as a pivot point for further attacks within the network. Given the public availability of an exploit, there is a high risk of widespread exploitation.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMonitor web server logs for requests to \u003ccode\u003e/goform/WifiBasicSet\u003c/code\u003e with abnormally long \u003ccode\u003esecurity_5g\u003c/code\u003e parameters to detect potential exploitation attempts. Deploy the Sigma rule \u003ccode\u003eDetect CVE-2026-8234 Exploitation Attempt\u003c/code\u003e to identify malicious requests.\u003c/li\u003e\n\u003cli\u003eImplement rate limiting for requests to \u003ccode\u003e/goform/WifiBasicSet\u003c/code\u003e to mitigate potential brute-force exploitation attempts.\u003c/li\u003e\n\u003cli\u003eSince no patch is available, consider replacing the affected EFM ipTIME A8004T routers with devices from vendors who provide security updates, especially if those devices are exposed to the internet.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-10T07:16:08Z","date_published":"2026-05-10T07:16:08Z","id":"/briefs/2026-05-efm-iptime-bo/","summary":"A stack-based buffer overflow vulnerability (CVE-2026-8234) exists in EFM ipTIME A8004T version 14.18.2, allowing remote attackers to execute arbitrary code by manipulating the security_5g argument in the formWifiBasicSet function.","title":"EFM ipTIME A8004T Stack-Based Buffer Overflow (CVE-2026-8234)","url":"https://feed.craftedsignal.io/briefs/2026-05-efm-iptime-bo/"}],"language":"en","title":"CraftedSignal Threat Feed — IpTIME A8004T 14.18.2","version":"https://jsonfeed.org/version/1.1"}