CVE-2020-19664
About
DrayTek Vigor2960 1.5.1 allows remote command execution via shell metacharacters in a toLogin2FA action to mainfunction.cgi.
Rainforest analyst review
An attacker slips shell metacharacters into the toLogin2FA action of the DrayTek Vigor2960's mainfunction.cgi and gets command execution on the router. The vector lists low privilege rather than none, so nominally some authentication is needed, but the target is an edge networking device.
DrayTek gear has a long history of being hammered by botnets, and the practical reality of edge devices is that the low-privilege bar is often trivially cleared with default or weak credentials. Command execution on a router is a pivot into the whole network behind it, which is exactly why these devices attract automated exploitation.
Our emphasis is exposure of the management interface and firmware currency. We locate which Vigor2960 units are reachable, confirm the firmware version, and weigh the PR:L requirement realistically, noting that unchanged default credentials effectively erase it. Edge devices earn a prioritization bump because a single one bridges outside to inside.
References
Related CVEs
Frequently asked questions
What is CVE-2020-19664?
DrayTek Vigor2960 1.5.1 allows remote command execution via shell metacharacters in a toLogin2FA action to mainfunction.cgi.
How severe is CVE-2020-19664?
CVE-2020-19664 carries a CVSS 3.1 base score of 8.8, rated high. On the Rainforest Risk Index — which weighs the severity alongside how easy the flaw is to reach and how broad its impact is — it scores 89 out of 100, in the critical band.
How is CVE-2020-19664 exploited?
According to the CVSS vector (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H): attack vector Network, attack complexity Low, privileges required Low, user interaction None. Impact on confidentiality High, integrity High and availability High.
Which products are affected by CVE-2020-19664?
Public advisories list the following as affected: vigor2960, vigor2960 firmware. Check the references on this page for the exact versions each vendor confirms.
How do I fix CVE-2020-19664?
Apply the fix the vendor published — the references on this page link to the primary advisories and patches. When patching can't happen right away, reduce the exposure of the affected component and watch it for exploitation attempts. Rainforest customers see this vulnerability correlated to their own assets and prioritized by real exposure, not by score alone.
Empower Your Security Strategy with Rainforest
Discover vulnerabilities early, prioritize critical threats, and protect what truly matters. Rainforest streamlines your security operations, saving you time and reducing costs, so you can focus on what drives your business forward.