CVE-2024-32475CWE-253CWE-617

Envoy RELEASE_ASSERT using auto_sni with :authority header > 255 bytes

High · published April 18, 2024

CVSS v3.1
7.5
EPSS
1%
Percentile
52.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00685 · 52.1th percentile
Weaknesses
CWE-253 · Incorrect Check of Function Return Value; CWE-617 · Reachable Assertion
Published
2024-04-18T14:18Z
EPSS history
Timeline
  • 18 APR 14:18Z
    Envoy RELEASE_ASSERT using auto_sni with :authority header > 255 bytes
    cvelistv5