CVE-2024-32475
Envoy RELEASE_ASSERT using auto_sni with :authority header > 255 bytes
Description
Envoy is a cloud-native, open source edge and service proxy. When an upstream TLS cluster is used with `auto_sni` enabled, a request containing a `host`/`:authority` header longer than 255 characters triggers an abnormal termination of Envoy process. Envoy does not gracefully handle an error when setting SNI for outbound TLS connection. The error can occur when Envoy attempts to use the `host`/`:authority` header value longer than 255 characters as SNI for outbound TLS connection. SNI length is limited to 255 characters per the standard. Envoy always expects this operation to succeed and abnormally aborts the process when it fails. This vulnerability is fixed in 1.30.1, 1.29.4, 1.28.3, and 1.27.5.
How to fix CVE-2024-32475
To remediate CVE-2024-32475, upgrade the affected package to a fixed version below.
- —upgrade to 1.27.5 or later
Is CVE-2024-32475 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 1.13.0, < 1.27.5, >= 1.28.0, < 1.28.3, >= 1.29.0, < 1.29.4, >= 1.30.0, < 1.30.1
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 |