{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","favicon":"https://feed.craftedsignal.io/favicon-32x32.png","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-76590/feed.json","home_page_url":"https://feed.craftedsignal.io/","icon":"https://feed.craftedsignal.io/apple-touch-icon.png","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":9.9,"id":"CVE-2026-76589"}],"_cs_exploited":true,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["TEW-755AP"],"_cs_severities":["critical"],"_cs_tags":["remote-code-execution","buffer-overflow","iot","networking","vulnerability","network-security","cve-2026-76590","cve-2026-76591","command-injection","network-device"],"_cs_type":"threat","_cs_vendors":["TRENDnet"],"content_html":"\u003cp\u003eA critical security vulnerability has been identified in the TRENDnet TEW-755AP wireless access point, affecting all firmware versions up to 20260702. The flaw resides within the function FUN_401000 of the /sbin/mycli binary, which fails to properly validate the length of the 'ssid' input argument. By providing an overly long string as the SSID, an attacker can trigger a stack-based buffer overflow. This vulnerability allows for remote execution of arbitrary code with the privileges of the mycli process. Given the availability of public proof-of-concept exploit code, the risk of active exploitation against vulnerable network infrastructure is high. Organizations utilizing these devices should prioritize patching or network isolation to mitigate potential remote compromise.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker performs network discovery to identify reachable TRENDnet TEW-755AP management interfaces.\u003c/li\u003e\n\u003cli\u003eAttacker establishes a connection to the device's management service (typically via HTTP or internal management API).\u003c/li\u003e\n\u003cli\u003eAttacker identifies the endpoint handling configuration changes related to wireless network settings.\u003c/li\u003e\n\u003cli\u003eAttacker constructs a malicious request containing an oversized 'ssid' parameter designed to overwrite adjacent stack memory.\u003c/li\u003e\n\u003cli\u003eAttacker transmits the crafted request to the target device, invoking the vulnerable FUN_401000 function.\u003c/li\u003e\n\u003cli\u003eThe /sbin/mycli binary attempts to copy the excessive 'ssid' data into a fixed-length buffer on the stack.\u003c/li\u003e\n\u003cli\u003eBuffer overflow occurs, overwriting the return address or function pointers within the stack frame.\u003c/li\u003e\n\u003cli\u003eExecution flow is hijacked, resulting in arbitrary command execution or process crash depending on the exploit payload.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-76589 results in a complete compromise of the wireless access point. Attackers can achieve remote code execution, allowing them to gain persistence, pivot deeper into the internal network, intercept wireless traffic, or cause a denial-of-service condition by crashing the system binary. This vulnerability is critical for environments relying on these access points as part of their edge network security.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eImmediately isolate all TRENDnet TEW-755AP devices from the public internet to prevent remote access by unauthorized parties.\u003c/li\u003e\n\u003cli\u003eAudit network perimeter logs for unusual traffic targeting the management interfaces of wireless network hardware.\u003c/li\u003e\n\u003cli\u003eApply manufacturer-provided firmware updates that address the buffer overflow in the /sbin/mycli binary.\u003c/li\u003e\n\u003cli\u003eMonitor internal network traffic for anomalous connection attempts or payload delivery patterns directed at embedded network devices.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-08-19T22:45:19Z","date_published":"2026-08-19T22:39:10Z","id":"https://feed.craftedsignal.io/briefs/2026-08-trendnet-tew-755ap-overflow/","summary":"A critical stack-based buffer overflow vulnerability in the /sbin/mycli binary of TRENDnet TEW-755AP access points allows remote unauthenticated attackers to execute arbitrary code via the 'ssid' argument.","title":"Stack-based Buffer Overflow in TRENDnet TEW-755AP Access Points","url":"https://feed.craftedsignal.io/briefs/2026-08-trendnet-tew-755ap-overflow/"}],"language":"en","title":"CraftedSignal Threat Feed - Cve-2026-76590","version":"https://jsonfeed.org/version/1.1"}