CVE-2025-11338
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Publication date: 2025-10-06

Last updated on: 2025-11-19

Assigner: VulDB

Description
A flaw has been found in D-Link DI-7100G C1 up to 20250928. This vulnerability affects the function sub_4C0990 of the file /webchat/login.cgi of the component jhttpd. Executing manipulation of the argument openid can lead to buffer overflow. It is possible to launch the attack remotely. The exploit has been published and may be used.
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Meta Information
Published
2025-10-06
Last Modified
2025-11-19
Generated
2026-06-16
AI Q&A
2025-10-06
EPSS Evaluated
2026-06-14
NVD
CVE-2025-11338
EUVD
EUVD-2025-32163
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
dlink di-7100g_c1_firmware 2025-09-28
dlink di-7100g_c1 *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-119 The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
CWE-120 The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.
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Executive Summary

CVE-2025-11338 is a buffer overflow vulnerability in the D-Link DI-7100G C1 device, specifically in the jhttpd component's /webchat/login.cgi script at the function sub_4C0990. The vulnerability occurs due to improper handling of the 'openid' argument, where input data is copied without verifying its size against the output buffer, leading to a buffer overflow. This flaw can be exploited remotely to cause unexpected behavior or execute arbitrary code. [1, 2]

Impact Analysis

This vulnerability can impact you by compromising the confidentiality, integrity, and availability of the affected system. Since it can be exploited remotely without local access, attackers can execute arbitrary code or cause system crashes, potentially leading to unauthorized access, data breaches, or denial of service. The exploit is publicly available and considered easy to use, increasing the risk of attack. [2]

Detection Guidance

Detection can involve monitoring for unusual or malformed HTTP requests targeting the /webchat/login.cgi endpoint with the openid parameter, which may indicate attempts to exploit the buffer overflow. Since the vulnerability is in the handling of the openid argument in jhttpd, inspecting HTTP traffic for suspicious or abnormally large openid parameter values could help. Specific commands are not provided in the resources, but network monitoring tools like tcpdump or Wireshark can be used to capture HTTP requests, and grep or similar tools can filter for requests to /webchat/login.cgi containing 'openid'. For example, using tcpdump: tcpdump -A -s 0 'tcp port 80' | grep '/webchat/login.cgi' | grep 'openid'. [2]

Mitigation Strategies

No known mitigations or countermeasures have been identified for this vulnerability. The recommended immediate step is to replace the affected D-Link DI-7100G C1 device with an alternative product. Since the exploit is publicly available and the vulnerability can be exploited remotely, discontinuing use of the vulnerable device is advised until a patch or fix is provided. [2]

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