{"id":43338,"date":"2025-05-23T21:22:16","date_gmt":"2025-05-23T21:22:16","guid":{"rendered":""},"modified":"2025-05-30T17:53:46","modified_gmt":"2025-05-30T23:53:46","slug":"cve-2025-4823-critical-buffer-overflow-vulnerability-in-totolink-routers","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-4823-critical-buffer-overflow-vulnerability-in-totolink-routers\/","title":{"rendered":"CVE-2025-4823: Critical Buffer Overflow Vulnerability in TOTOLINK Routers<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

CVE-2025-4823 is a critical vulnerability discovered in TOTOLINK A702R, A3002R, and A3002RU routers. This vulnerability has a high impact on the security of these devices, as it allows attackers to potentially compromise the system or leak sensitive data. The flaw lies within the HTTP POST Request<\/a> Handler, specifically the function submit-url of the file \/boafrm\/formReflashClientTbl. Given the widespread use of these routers, this vulnerability poses a significant risk<\/a> to both individuals and organizations, necessitating immediate attention and remediation.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-4823
\nSeverity: Critical (8.8 CVSS Score)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: System compromise and potential<\/a> data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

TOTOLINK A702R<\/a> | 3.0.0-B20230809.1615
\nTOTOLINK A3002R<\/a> | 3.0.0-B20230809.1615
\nTOTOLINK A3002RU | 3.0.0-B20230809.1615<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The vulnerability is a buffer overflow<\/a> issue. It arises due to insufficient bounds checking by the HTTP POST Request<\/a> Handler when processing input data within the submit-url function of the \/boafrm\/formReflashClientTbl file. An attacker could exploit this vulnerability by sending a specially crafted HTTP POST request<\/a> with an oversized payload to the vulnerable endpoint. This could overflow the buffer<\/a>, causing memory corruption, and potentially allowing the attacker to execute arbitrary code or cause a Denial of Service (DoS) condition.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Here’s a basic concept of how the vulnerability might be exploited:<\/p>\n

POST \/boafrm\/formReflashClientTbl HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/x-www-form-urlencoded\nContent-Length: [Length]\nsubmit-url=[overly long string here]<\/code><\/pre>\n
In this conceptual example, the “submit-url” parameter contains a string that is longer than the buffer can handle, causing a buffer overflow<\/a>.
\nPlease note that this is a simplified representation of how an exploit might look, and a real-world exploit would likely be more complex and tailored to the specific characteristics of the target system.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview CVE-2025-4823 is a critical vulnerability discovered in TOTOLINK A702R, A3002R, and A3002RU routers. This vulnerability has a high impact on the security of these devices, as it allows attackers to potentially compromise the system or leak sensitive data. The flaw lies within the HTTP POST Request Handler, specifically the function submit-url of the file […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[86,87],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-43338","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow","attack_vector-dos"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t