CVE-2023-27492

4.8 MEDIUM 0.7% exploit odds Fix listed

What it is

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, the Lua filter is vulnerable to denial of service. Attackers can send large request bodies for routes that have Lua filter enabled and trigger crashes. As of versions versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, Envoy no longer invokes the Lua coroutine if the filter has been reset. As a workaround for those whose Lua filter is buffering all requests/ responses, mitigate by using the buffer filter to avoid triggering the local reply in the Lua filter.

At a glance

Exploitability: Can be exploited over the network with a low-privilege account, but needs a user to act. High risk of service disruption.
Exploit odds: 0.7% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2023-04-04 19:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 05:45 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.7% in the next 30 days (EPSS).
Severity: 4.8 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2023-04-04 19:15 UTC
Last modified: 2026-06-17 05:45 UTC
Exploit probability: 0.7% · EPSS, next 30 days
Weakness: CWE-770 · Allocation without limits
Record status: Modified

Affected

Envoyproxy Envoy < 1.22.9
Envoyproxy Envoy < 1.23.6
Envoyproxy Envoy < 1.24.4
Envoyproxy Envoy < 1.25.3

Attack profile CVSS 3.1 · 4.8

Attack vector: Network
Complexity: High
Privileges needed: Low
User interaction: Required
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2023-27492.md and follow it. Check whether this project is affected by CVE-2023-27492. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record