{"id":36020,"date":"2025-05-07T07:31:18","date_gmt":"2025-05-07T07:31:18","guid":{"rendered":""},"modified":"2025-08-31T18:37:57","modified_gmt":"2025-09-01T00:37:57","slug":"cve-2025-4139-critical-buffer-overflow-vulnerability-in-netgear-ex6120-1-0-0-68","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-4139-critical-buffer-overflow-vulnerability-in-netgear-ex6120-1-0-0-68\/","title":{"rendered":"CVE-2025-4139: Critical Buffer Overflow Vulnerability in Netgear EX6120 1.0.0.68<\/strong>"},"content":{"rendered":"

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

In our continuously evolving digital world, security vulnerabilities pose a significant threat to both individuals and businesses alike. One such recent discovery is the critical vulnerability identified in Netgear EX6120 1.0.0.68, a widely used network product. The vulnerability, classified as CVE-2025-4139, has been found in the fwAcosCgiInbound function and can lead to a buffer overflow<\/a>. This vulnerability has substantial implications, including potential system<\/a> compromise and data leakage.
\nThe vulnerability CVE-2025-4139 matters because it can be exploited remotely<\/a>, putting a vast number of systems at risk. Unfortunately, the vendor has been unresponsive to this disclosure, making immediate mitigation efforts crucial for all affected systems.<\/p>\n

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

CVE ID: CVE-2025-4139
\nSeverity: Critical (8.8\/10 CVSS Score)
\nAttack Vector: Remote
\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

Netgear EX6120<\/a> | 1.0.0.68<\/p>\n

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

The exploit works by manipulating the ‘host’ argument in the fwAcosCgiInbound function of the Netgear EX6120 1.0.0.68. This manipulation allows a buffer overflow<\/a> to occur. A buffer overflow<\/a> is a situation where more data is written into a fixed-length buffer than the buffer can handle. This overflow in memory can overwrite adjacent memory locations and cause unpredictable system behavior, including crashes, incorrect execution, and most critically, the execution of malicious code<\/a>.<\/p>\n

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

Below is a conceptual example illustrating how the vulnerability might be exploited<\/a>. This is a sample HTTP request that includes a malicious payload designed to trigger the buffer overflow<\/a>.<\/p>\n

POST \/fwAcosCgiInbound HTTP\/1.1\nHost: vulnerable-router.example.com\nContent-Type: application\/json\n{ \"host\": \"...\" } \/\/ Insert malicious payload here that overflows the buffer<\/code><\/pre>\n
It should be noted that this is a conceptual example. Real-world exploits may be more complex and require deeper understanding of the system’s internals.<\/p>\n
Countermeasures and Mitigation<\/strong><\/p>\n
Until the vendor releases a patch, it’s advisable to use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation method. These measures can detect and prevent the exploitation of the vulnerability<\/a>. It is always important to keep systems up to date with the latest security<\/a> patches and updates to ensure maximum protection against such threats.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview In our continuously evolving digital world, security vulnerabilities pose a significant threat to both individuals and businesses alike. One such recent discovery is the critical vulnerability identified in Netgear EX6120 1.0.0.68, a widely used network product. The vulnerability, classified as CVE-2025-4139, has been found in the fwAcosCgiInbound function and can lead to a buffer […]<\/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-36020","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