{"id":64249,"date":"2025-08-22T22:26:04","date_gmt":"2025-08-22T22:26:04","guid":{"rendered":""},"modified":"2025-10-21T17:37:20","modified_gmt":"2025-10-21T23:37:20","slug":"cve-2025-9088-critical-buffer-overflow-vulnerability-in-tenda-ac20-16-03-08-12","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-9088-critical-buffer-overflow-vulnerability-in-tenda-ac20-16-03-08-12\/","title":{"rendered":"CVE-2025-9088: Critical Buffer Overflow Vulnerability in Tenda AC20 16.03.08.12<\/strong>"},"content":{"rendered":"

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

The digital ecosystem is constantly evolving, and with this evolution comes an ever-increasing need for tight security measures. A recent vulnerability, identified as CVE-2025-9088, has been found in the Tenda AC20 16.03.08.12. This vulnerability exposes users to a potential system compromise or data<\/a> leakage. It affects the function save_virtualser_data of the file \/goform\/formSetVirtualSer, leading to a stack-based buffer overflow<\/a>. This post seeks to delve into the details of this vulnerability<\/a>, its potential impact, and ways to mitigate it.
\nThe importance of understanding this vulnerability<\/a> cannot be overstated. As it affects a common networking device, the Tenda AC20<\/a>, it has the potential to impact thousands, if not millions, of users worldwide. It poses a significant threat to the integrity and confidentiality of data and systems<\/a> connected to these devices.<\/p>\n

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

CVE ID: CVE-2025-9088
\nSeverity: Critical (8.8)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: Potential system compromise<\/a> or data leakage<\/p>\n

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

Product | Affected Versions<\/p>\n

Tenda AC20<\/a> | 16.03.08.12<\/p>\n

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

The vulnerability stems from a lack of proper input validation<\/a> in the function save_virtualser_data of the file \/goform\/formSetVirtualSer. An attacker can manipulate the argument list, causing a buffer overflow<\/a>. A buffer overflow is a common coding error that can lead<\/a> to arbitrary code execution. In this case, the attacker could execute malicious code remotely, leading to a potential<\/a> system compromise or data leakage.<\/p>\n

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

Here is a conceptual example of how the vulnerability might be exploited. This is not actual exploit code, but rather a simplified representation to illustrate the attack.<\/p>\n

POST \/goform\/formSetVirtualSer HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{ \"arguments\": \"A\".repeat(1025) } \/\/ Exceeds the buffer size<\/code><\/pre>\n
In this example, the attacker sends a POST request with an overly long argument list, causing a buffer overflow<\/a> in the save_virtualser_data function.<\/p>\n
Mitigation<\/strong><\/p>\n
Users are advised to apply the vendor patch as soon as it becomes available. In the interim, users can use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure. These tools can help to detect and block exploit attempts, reducing the risk of a successful attack.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The digital ecosystem is constantly evolving, and with this evolution comes an ever-increasing need for tight security measures. A recent vulnerability, identified as CVE-2025-9088, has been found in the Tenda AC20 16.03.08.12. This vulnerability exposes users to a potential system compromise or data leakage. It affects the function save_virtualser_data of the file \/goform\/formSetVirtualSer, leading […]<\/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":[86,80],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-64249","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow","attack_vector-rce"],"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