Sources: National Vulnerability Database, CVE.org, CISA KEV, FIRST EPSS
CVE-2026-129453 Overview
A vulnerability was found in DrayTek Vigor2960 1.5.1.6. This issue affects the function check_file_exist of the file /cgi-bin/mainfunction.cgi of the component File Existence Check. Performing a manipulation of the argument upload_name results in heap-based buffer overflow. The attack may be initiated remotely. The exploit has been made public and could be used. Upgrading to version 1.5.1.7 is capable of addressing this issue. Upgrading the affected component is recommended. The vendor recommends: "1.5.1.6 isn't the latest version of 2960, the latest version fixes many security issues. And we have another one in our release plan which should solve the issues reported."
Critical Impact
Affected Products
- DrayTek Vigor2960: see the vendor advisory for the exact affected versions
Discovery Timeline
- 2026-11-15: CVE-2026-129453 published to the National Vulnerability Database by cna@vuldb.com
- 2026-11-15: last updated in the NVD database
Technical Details for CVE-2026-129453
Vulnerability Analysis
CVE-2026-129453 is a Memory Buffer Errors weakness (CWE-119: Memory Buffer Errors, CWE-122: Heap Buffer Overflow) in DrayTek Vigor2960. Based on its CVSS vector, the flaw can be reached over the network, needs some level of access, and needs no user interaction. The program reads or writes outside the memory it should.
With a CVSS base score of 8.6, apply the vendor fix and confirm exposure on internet facing and business critical assets first.
Root Cause
The weakness is classified as CWE-119: Memory Buffer Errors, CWE-122: Heap Buffer Overflow. The program reads or writes outside the memory it should.
Attack Vector
Based on the CVSS vector, the flaw can be reached over the network, needs some level of access, and needs no user interaction. Attack complexity is low complexity.
No exploitation in the wild is confirmed by CISA at the time of the last update. Check the references below for any vendor or researcher proof of concept.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Detection Methods for CVE-2026-129453
Detection Strategies
- Inventory every instance of DrayTek Vigor2960 and compare the running version with the affected range above.
- Check external attack surface scans for internet facing instances of the component.
- Run an authenticated vulnerability scan once your scanner ships a check for this CVE.
Monitoring Recommendations
- Forward DrayTek Vigor2960 application, access and audit logs to your SIEM for retrospective hunting.
- Alert on new processes, configuration changes or outbound connections from the affected service.
- Track the vendor advisory and the CISA KEV catalog for changes in exploitation status.
How to Mitigate CVE-2026-129453
Immediate Actions Required
- Apply the fixed version of DrayTek Vigor2960 named in the vendor advisory.
- Prioritize internet facing and business critical instances first.
- Rescan after the change to confirm the exposure is closed.
Patch Information
Use the fixed version listed in the vendor advisory for DrayTek Vigor2960.
Workarounds
- If patching must wait, restrict network access to the affected service and place it behind authentication or a web application firewall rule.
CWE References
- CWE-119: Memory Buffer Errors More CVEs with this weakness
- CWE-122: Heap Buffer Overflow More CVEs with this weakness
Technical References
This entry is built directly from NVD, CISA KEV and EPSS data. Verify fixed versions in the vendor advisory before you deploy.
Frequently asked questions
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