CVE-2025-8833
BaseFortify
Publication date: 2025-08-11
Last updated on: 2025-09-04
Assigner: VulDB
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| linksys | re6250_firmware | 1.0.04.001 |
| linksys | re6250 | * |
| linksys | re6300_firmware | 1.2.07.001 |
| linksys | re6300 | * |
| linksys | re6350_firmware | 1.0.04.001 |
| linksys | re6350 | * |
| linksys | re7000_firmware | 1.1.05.003 |
| linksys | re7000 | * |
| linksys | re9000_firmware | 1.0.04.002 |
| linksys | re9000 | * |
| linksys | re6500_firmware | 1.0.013.001 |
| linksys | re6500 | * |
Helpful Resources
Exploitability
| 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-121 | A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
CVE-2025-8833 is a stack-based buffer overflow vulnerability found in several Linksys range extender models (RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000). The flaw exists in the langSwitchBack function, specifically in the handling of the langSelectionOnly argument. Improper validation of this argument allows an attacker to supply an excessively long input, causing a stack overflow. This can lead to remote crashes or potentially allow execution of arbitrary code on the affected device. [1, 2]
How can this vulnerability impact me? :
This vulnerability can severely impact affected devices by compromising their confidentiality, integrity, and availability. An attacker can remotely exploit the flaw without authentication, potentially causing the device to crash or execute arbitrary code. This could lead to unauthorized access, disruption of network services, or control over the device, posing significant security risks. [2]
How can this vulnerability be detected on my network or system? Can you suggest some commands?
Detection of this vulnerability involves monitoring for unusual or malicious requests to the /goform/langSwitchBack endpoint with abnormally long langSelectionOnly parameters. Since the vulnerability is triggered by a stack-based buffer overflow via this parameter, network intrusion detection systems (NIDS) or web application firewalls (WAF) can be configured to alert on HTTP requests targeting /goform/langSwitchBack with unusually large langSelectionOnly values. Specific commands depend on your environment, but for example, using tcpdump or tshark to capture HTTP traffic and grep to filter requests: tcpdump -A -s 0 'tcp port 80' | grep '/goform/langSwitchBack' or tshark -Y 'http.request.uri contains "/goform/langSwitchBack"' -T fields -e http.request.uri. Additionally, checking router logs for crashes or reboots may indicate exploitation attempts. However, no official detection scripts or signatures are provided. [1, 2]
What immediate steps should I take to mitigate this vulnerability?
Immediate mitigation steps include discontinuing use of the affected Linksys models (RE6250, RE6300, RE6350, RE6500, RE7000, RE9000) with vulnerable firmware versions up to 20250801, as no patches or vendor responses are available. Replace these devices with alternative products not affected by this vulnerability. Additionally, restrict remote access to the devices, especially blocking access to the /goform/langSwitchBack endpoint from untrusted networks. Employ network-level protections such as firewalls or intrusion prevention systems to detect and block exploit attempts targeting this vulnerability. Monitor network traffic and device behavior for signs of exploitation. [2]