CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
Low
SSVC
Exploitation
none
Automatable
yes
Technical Impact
partial
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.
[
{
"cpes": [
"cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*"
],
"vendor": "envoyproxy",
"product": "envoy",
"versions": [
{
"status": "affected",
"version": "1.13.0",
"lessThan": "1.27.5",
"versionType": "semver"
}
],
"defaultStatus": "unknown"
}
]
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
Low
SSVC
Exploitation
none
Automatable
yes
Technical Impact
partial