{"id":35876,"date":"2025-05-07T05:30:26","date_gmt":"2025-05-07T05:30:26","guid":{"rendered":""},"modified":"2025-09-10T12:50:06","modified_gmt":"2025-09-10T18:50:06","slug":"cve-2025-4120-critical-buffer-overflow-vulnerability-in-netgear-jwnr2000v2-1-0-0-11","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-4120-critical-buffer-overflow-vulnerability-in-netgear-jwnr2000v2-1-0-0-11\/","title":{"rendered":"CVE-2025-4120: Critical Buffer Overflow Vulnerability in Netgear JWNR2000v2 1.0.0.11<\/strong>"},"content":{"rendered":"

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

A severe vulnerability has been unearthed in the firmware of the Netgear JWNR2000v2 1.0.0.11. This vulnerability is critically classified and has been assigned the identifier CVE-2025-4120. With this exploit, cyber attackers can manipulate the host argument to cause a buffer overflow, leading to potential system compromise<\/a> or data leakage. This vulnerability is of particular concern due to the possibility of remote attack<\/a>, and the lack of response from the vendor despite early contact about the issue.<\/p>\n

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

CVE ID: CVE-2025-4120
\nSeverity: Critical (8.8 CVSS Severity Score)
\nAttack Vector: Remote
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: Potential system<\/a> compromise or data leakage<\/p>\n

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

Product | Affected Versions<\/p>\n

Netgear JWNR2000v2<\/a> | 1.0.0.11<\/p>\n

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

The vulnerability lies in the function<\/a> sub_4238E8 of the firmware. By manipulating the host argument within this function, an attacker can cause a buffer overflow<\/a>. This means that the attacker can overwrite the data in memory, causing the system to crash or execute arbitrary code<\/a>. This can lead to potential<\/a> system compromise, allowing the attacker to gain unauthorized access to data and resources.<\/p>\n

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

The following is a conceptual example of how the vulnerability<\/a> might be exploited. In this example, an HTTP POST request is sent to a vulnerable endpoint with a manipulated host argument, causing a buffer overflow<\/a>:<\/p>\n

POST \/sub_4238E8 HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/x-www-form-urlencoded\nhost=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA<\/code><\/pre>\n
In this conceptual example, ‘A’ is used as a placeholder for the malicious payload.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
Until the vendor provides a patch for this critical vulnerability<\/a>, it is strongly recommended to use a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) as temporary mitigation. These measures can help detect and block attempts to exploit this vulnerability<\/a>. Users and administrators should also consider disconnecting the affected device from the network until a patch is available to reduce the risk<\/a> of compromise.
\nKeep in mind that this is only a temporary solution. The ultimate resolution will be a vendor-supplied patch. Always keep your systems and devices updated with the latest software versions and security patches to protect against such vulnerabilities<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview A severe vulnerability has been unearthed in the firmware of the Netgear JWNR2000v2 1.0.0.11. This vulnerability is critically classified and has been assigned the identifier CVE-2025-4120. With this exploit, cyber attackers can manipulate the host argument to cause a buffer overflow, leading to potential system compromise or data leakage. This vulnerability is of particular […]<\/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],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-35876","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow"],"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