CVE-2021-43825

Severity CVSS v4.0:

Pending analysis

Type:

CWE-416 Use After Free

Publication date:

22/02/2022

Last modified:

02/03/2022

Description

Envoy is an open source edge and service proxy, designed for cloud-native applications. Sending a locally generated response must stop further processing of request or response data. Envoy tracks the amount of buffered request and response data and aborts the request if the amount of buffered data is over the limit by sending 413 or 500 responses. However when the buffer overflows while response is processed by the filter chain the operation may not be aborted correctly and result in accessing a freed memory block. If this happens Envoy will crash resulting in a denial of service.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x

7.50

Severity 3.x

HIGH

Vector 2.0

AV:N/AC:L/Au:N/C:N/I:N/A:P CVSS v2.0 Severity and Metrics:

Base Score: 5.00 MEDIUM
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Physical

Base Score 2.0

5.00

Severity 2.0

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:envoyproxy:envoy::::::::		1.18.6 (excluding)
cpe:2.3:a:envoyproxy:envoy::::::::	1.19.0 (including)	1.19.3 (excluding)
cpe:2.3:a:envoyproxy:envoy::::::::	1.20.0 (including)	1.20.2 (excluding)
cpe:2.3:a:envoyproxy:envoy::::::::	1.21.0 (including)	1.21.1 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2021-43825

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools