CVE-2026-113392: DrayTek Vigor2960 path traversal in apmupload

CVE-2026-113392 · Severity: high · CVSS 7.4 · Published 2026-10-20

DrayTek Vigor2960 is a business-class VPN router used in corporate networks. An authenticated administrator can exploit a path traversal vulnerability in the apmupload function to write arbitrary files to any location on the device, potentially compromising system integrity or enabling further attacks. The vulnerability has been publicly disclosed and affects end-of-support hardware with only limited vendor review of critical issues.

Technologies: DrayTek Vigor2960. Vendors: DrayTek.

Quick answers

Is CVE-2026-113392 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-113392 being exploited in the wild.
How severe is CVE-2026-113392?
High severity, with a CVSS score of 7.4, published 20 October 2026.
Which products and versions are affected?
DrayTek Vigor2960 1.5.1.6 Revision 8218 and earlier.
Is there a fix for CVE-2026-113392?
Yes: fixed in Vigor2960 1.5.1.7. Until then: Restrict administrative access to the web interface and limit which users hold administrator privileges, as exploitation requires an authenticated administrator session. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-113392 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-113392?
Check whether you run DrayTek Vigor2960 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Fixed in: Vigor2960 1.5.1.7

Restrict administrative access to the web interface and limit which users hold administrator privileges, as exploitation requires an authenticated administrator session.

Technical details

The apmupload CGI handler in /cgi-bin/mainfunction.cgi performs a two-stage file operation: first uploading to a controlled path with prefix validation, then moving the file using an attacker-supplied filename parameter without proper path normalization. An authenticated attacker can include path traversal sequences (e.g., ../../../) in the filename parameter to move uploaded content to arbitrary paths outside the intended APM directory. Since the CGI runs as root, this becomes an arbitrary file write primitive when the destination parent directory exists.

Affected products

  • DrayTek Vigor2960 1.5.1.6 Revision 8218 and earlier

Timeline

  • 2026-10-20: disclosed
  • exploited: Exploit proof-of-concept publicly available

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.