Description
Envoy is a high-performance edge/middle/service proxy. External authentication can be bypassed by downstream connections. Downstream clients can force invalid gRPC requests to be sent to ext_authz, circumventing ext_authz checks when failure_mode_allow is set to true. 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.
References (2)
Core 2
Core References
Vendor Advisory x_refsource_confirm
https://github.com/envoyproxy/envoy/security/advisories/GHSA-gq3v-vvhj-96j6
Patch, Vendor Advisory x_refsource_misc
https://github.com/envoyproxy/envoy/commit/29989f6cc8bfd8cd2ffcb7c42711eb02c7a5168a
Scores
CVSS v3
8.6
EPSS
0.0004
EPSS Percentile
10.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-20
Status
published
Products (1)
envoyproxy/envoy
1.26.0 - 1.26.7
Published
Feb 09, 2024
Tracked Since
Feb 18, 2026