{"id":51103,"date":"2025-06-11T08:23:30","date_gmt":"2025-06-11T08:23:30","guid":{"rendered":""},"modified":"2025-10-22T21:12:50","modified_gmt":"2025-10-23T03:12:50","slug":"cve-2025-5623-a-critical-stack-based-buffer-overflow-vulnerability-in-d-link-dir-816-1-10cnb05","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-5623-a-critical-stack-based-buffer-overflow-vulnerability-in-d-link-dir-816-1-10cnb05\/","title":{"rendered":"CVE-2025-5623: A Critical Stack-based Buffer Overflow Vulnerability in D-Link DIR-816 1.10CNB05<\/strong>"},"content":{"rendered":"

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

In the ever-growing world of cybersecurity threats, a new vulnerability has emerged that is shaking the foundations of outdated network devices. The CVE-2025-5623 is a severe vulnerability identified in D-Link DIR-816 1.10CNB05, a product which is no longer supported by the manufacturer, making it a prime target for cybercriminals. This vulnerability exploits the ‘qosClassifier’ function of the file<\/a> ‘\/goform\/qosClassifier. It is classified as critical due to its severe impact potential<\/a> and the ease of its exploitation.
\nThe primary concern regarding this vulnerability is that the attack can be initiated remotely<\/a>, making any device with an internet connection a potential target. The disclosure of the exploit to the public further amplifies its threat<\/a> level. It’s a race against time for network administrators and users to mitigate this vulnerability<\/a> before falling victim to a potential system compromise or data leakage.<\/p>\n

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

CVE ID: CVE-2025-5623
\nSeverity: Critical (CVSS 9.8)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: Potential system<\/a> compromise and data leakage<\/p>\n

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

Product | Affected Versions<\/p>\n

D-Link DIR-816<\/a> | 1.10CNB05<\/p>\n

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

The exploit takes advantage of a stack-based buffer overflow vulnerability<\/a> within the ‘qosClassifier’ function of the file ‘\/goform\/qosClassifier. It involves the manipulation of the ‘dip_address’ or ‘sip_address’ argument, causing an excessive amount of data to be loaded into the stack memory<\/a>, triggering a stack overflow. As a result, an attacker can execute arbitrary code or cause a denial of service, potentially leading to system compromise or data<\/a> leakage.<\/p>\n

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

Below is a conceptual example of how the vulnerability might be exploited. This is a simplified HTTP request<\/a> that shows how an attacker might overload the ‘dip_address’ or ‘sip_address’ value with excessive data.<\/p>\n

POST \/goform\/qosClassifier HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/x-www-form-urlencoded\ndip_address=AAAAAAAA...[long string of As]...<\/code><\/pre>\n
Note: The above is a conceptual representation and may not accurately reflect the actual code used in an attack.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
While the ideal solution is to apply the vendor patch for this vulnerability<\/a>, it is important to note that D-Link no longer supports the affected product. As a temporary mitigation, utilising Web Application Firewall (WAF) or Intrusion Detection System (IDS) can help to detect and prevent exploit attempts. However, considering the severity and potential impact of this vulnerability<\/a>, users are strongly recommended to upgrade their network devices to models that are currently supported and regularly updated by the vendor.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview In the ever-growing world of cybersecurity threats, a new vulnerability has emerged that is shaking the foundations of outdated network devices. The CVE-2025-5623 is a severe vulnerability identified in D-Link DIR-816 1.10CNB05, a product which is no longer supported by the manufacturer, making it a prime target for cybercriminals. This vulnerability exploits the ‘qosClassifier’ […]<\/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-51103","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