Linksys E1700 Buffer Overflow Flaw Rated Critical, Vendor Unresponsive
A critical stack-based buffer overflow in Linksys E1700 firmware allows remote attacks, but the vendor has not responded to disclosure attempts.
Key points
- CVE-2026-108893 is rated Critical with a CVSS score of 9.4.
- The flaw affects Linksys E1700 devices running firmware up to version 1.0.0.4.003.
- Linksys did not respond when contacted about this security issue.
A critical vulnerability in Linksys E1700 routers allows remote attackers to exploit a stack-based buffer overflow. The National Vulnerability Database assigned this flaw the identifier CVE-2026-108893 and rated it as Critical. The issue stems from improper handling of arguments within a specific web form function on the device.
At a glance
- CVE
- CVE-2026-108893
- Product
- Linksys E1700
- CVSS
- 9.4 Critical
- Weakness
- stack-based buffer overflow
- Exploited
- No known exploitation
The vulnerability carries a CVSS score of 9.4, placing it in the highest severity range. According to the NVD record, the flaw is linked to weaknesses CWE-121 and CWE-119. The specific function involved is setVlan, located in the file /goform/setVlan. Manipulation of the vlan_set argument triggers the stack-based buffer overflow, enabling remote exploitation.
Context and Background
The disclosure notes that exploit code for this vulnerability is publicly available. The record states that the exploit might be used by attackers. This availability increases the risk to any unpatched systems currently connected to the internet. The nature of the flaw suggests that remote access to the vulnerable form is required to trigger the overflow.
The vendor was contacted early in the disclosure process regarding this security issue. However, Linksys did not respond in any way to these outreach efforts. This lack of communication leaves users without official guidance or confirmation regarding a patch timeline. The absence of a vendor response complicates remediation strategies for administrators managing these devices.
Who Is Affected
This vulnerability specifically affects Linksys E1700 hardware running firmware versions up to 1.0.0.4.003. Any device operating on this version or earlier is susceptible to the stack-based buffer overflow. Users of this model should verify their current firmware version to determine if they fall within the affected range.
The impact is limited to the specific E1700 model and the stated firmware versions. Other Linksys products or different firmware versions are not mentioned as affected in this specific record. Administrators managing networks with this hardware should prioritize identifying these specific devices for risk assessment and potential mitigation.
What should you do?
Since no fix has been confirmed by the vendor, immediate remediation is not possible through official updates. Organizations using the E1700 should assess their exposure and consider isolation measures. Monitoring for unusual traffic patterns associated with the vulnerable form can help detect attempts to exploit the flaw.
What to do and how to stay safe: Linksys
- Identify all Linksys E1700 devices on your network and check if they run firmware version 1.0.0.4.003 or earlier.
- Isolate affected devices from the public internet or place them behind strict access controls to limit exposure to remote attacks.
- Monitor network logs for traffic directed to the /goform/setVlan endpoint to detect potential exploitation attempts.
- Await official communication from the vendor regarding a security update, while maintaining heightened monitoring on vulnerable endpoints.
Step-by-step guide: Risk Based Vulnerability Management: Prioritize Fixes by Actual Threat
General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is the severity of CVE-2026-108893?
The vulnerability is rated Critical with a CVSS score of 9.4 by the National Vulnerability Database.
Which Linksys devices are affected by this flaw?
The Linksys E1700 router is affected if it is running firmware version 1.0.0.4.003 or earlier.
Has the vendor provided a patch for this issue?
No, the vendor was contacted but did not respond, and no fix has been confirmed or released yet.
