Skip to content
Fencer Vulns
medium 4.3

CVE-2024-23323 json

Excessive CPU usage when URI template matcher is configured using regex in Envoy

published 2024-02-09 2 y ago modified 2026-09-08 2 mo ago also BIT-envoy-2024-23323 , EUVD-2024-20838 , GHSA-x278-4w4x-r7ch

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits
0
none known

Summary

Envoy is a high-performance edge/middle/service proxy. The regex expression is compiled for every request and can result in high CPU usage and increased request latency when multiple routes are configured with such matchers. This issue has been addressed in released 1.29.1, 1.28.1, 1.27.3, and 1.26.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Patch / fix

  • bitnami envoy 1.26.7, 1.27.3, 1.28.1, 1.29.1
  • envoyproxy envoy 1.26.7, 1.27.3, 1.28.1, 1.29.1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-23323 updated cvss 5.3

envoy: Excessive CPU usage when URI template matcher is configured using regex

  • Red Hat OpenShift Service Mesh 2 servicemesh-proxy, servicemesh-proxy-wasm, openshift-service-mesh/proxyv2-rhel8
    affected: no fix available

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.50% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
OSV 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
bitnami envoy
>=1.26.0, <1.26.7
>=1.27.0, <1.27.3
>=1.28.0, <1.28.1
>=1.29.0, <1.29.1
1.26.7
1.27.3
1.28.1
1.29.1

Affected products

  • envoyproxy envoy

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-1176 Inefficient CPU Computation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.