CVE-2023-35943
Envoy vulnerable to CORS filter segfault when origin header is removed
7.5
HIGH
CVSS 3.1
EPSS 0.01%
Description
Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12, the CORS filter will segfault and crash Envoy when the `origin` header is removed and deleted between `decodeHeaders`and `encodeHeaders`. Versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12 have a fix for this issue. As a workaround, do not remove the `origin` header in the Envoy configuration.
How to fix CVE-2023-35943
To remediate CVE-2023-35943, upgrade the affected package to a fixed version below.
- —upgrade to 1.23.12 or later
Is CVE-2023-35943 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 1.23.0, < 1.23.12, >= 1.24.0, < 1.24.10, >= 1.25.0, < 1.25.9, >= 1.26.0, < 1.26.4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |