{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-9393/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":8.8,"id":"CVE-2026-9393"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Magic B0 (\u003c= 100R002)"],"_cs_severities":["critical"],"_cs_tags":["buffer-overflow","cve-2026-9393","h3c"],"_cs_type":"advisory","_cs_vendors":["H3C"],"content_html":"\u003cp\u003eA buffer overflow vulnerability, identified as CVE-2026-9393, has been discovered in H3C Magic B0 devices up to version 100R002. The vulnerability resides within the \u003ccode\u003eEdit_BasicSSID_5G\u003c/code\u003e function of the \u003ccode\u003e/goform/aspForm\u003c/code\u003e file. Successful exploitation allows remote attackers to potentially execute arbitrary code on the affected device. The vulnerability was reported to the vendor, but there has been no response. Public exploits are available, increasing the risk of exploitation. This poses a significant security risk to organizations using affected H3C devices, especially since the attack can be initiated remotely without authentication in some configurations.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker identifies an H3C Magic B0 device with firmware version up to 100R002 exposed to the network.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious HTTP request targeting the \u003ccode\u003e/goform/aspForm\u003c/code\u003e endpoint.\u003c/li\u003e\n\u003cli\u003eThe crafted request includes the \u003ccode\u003eEdit_BasicSSID_5G\u003c/code\u003e function call with an overly long string in the \u003ccode\u003eparam\u003c/code\u003e argument.\u003c/li\u003e\n\u003cli\u003eThe device\u0026rsquo;s web server processes the request without proper bounds checking on the \u003ccode\u003eparam\u003c/code\u003e argument.\u003c/li\u003e\n\u003cli\u003eThe overly long \u003ccode\u003eparam\u003c/code\u003e value overflows the buffer allocated for it in memory.\u003c/li\u003e\n\u003cli\u003eThe buffer overflow overwrites adjacent memory regions, potentially including critical program data or code execution pointers.\u003c/li\u003e\n\u003cli\u003eThe attacker gains arbitrary code execution on the device.\u003c/li\u003e\n\u003cli\u003eThe attacker can then leverage the compromised device for further malicious activities, such as data exfiltration or lateral movement within the network.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-9393 can lead to complete compromise of the H3C Magic B0 device. Given that these devices often act as network gateways or access points, a compromised device can be used to eavesdrop on network traffic, launch attacks against other devices on the network, or create a persistent backdoor. While the exact number of vulnerable devices is unknown, the public availability of exploits makes this a high-risk vulnerability that requires immediate attention.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply any available patches or firmware updates released by H3C to address CVE-2026-9393.\u003c/li\u003e\n\u003cli\u003eIf patches are unavailable, consider implementing network segmentation to limit the exposure of H3C Magic B0 devices.\u003c/li\u003e\n\u003cli\u003eMonitor network traffic for suspicious HTTP requests targeting the \u003ccode\u003e/goform/aspForm\u003c/code\u003e endpoint with unusually long \u003ccode\u003eparam\u003c/code\u003e arguments. Deploy the Sigma rule \u003ccode\u003eDetect H3C Magic B0 CVE-2026-9393 Attempt\u003c/code\u003e to detect potential exploitation attempts.\u003c/li\u003e\n\u003cli\u003eImplement access control lists to restrict access to H3C Magic B0 devices to only authorized personnel or systems.\u003c/li\u003e\n\u003cli\u003eEnable logging on H3C Magic B0 devices, where available, and forward logs to a SIEM for analysis.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-26T13:49:33Z","date_published":"2026-05-26T13:49:33Z","id":"https://feed.craftedsignal.io/briefs/2026-05-cve-2026-9393-h3c-magic-b0-overflow/","summary":"A buffer overflow vulnerability (CVE-2026-9393) exists in the Edit_BasicSSID_5G function of H3C Magic B0 devices up to version 100R002, allowing remote attackers to execute arbitrary code by manipulating the 'param' argument in the /goform/aspForm file.","title":"H3C Magic B0 Buffer Overflow Vulnerability (CVE-2026-9393)","url":"https://feed.craftedsignal.io/briefs/2026-05-cve-2026-9393-h3c-magic-b0-overflow/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2026-9393","version":"https://jsonfeed.org/version/1.1"}