Vulnerability Monitor

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CVE-2021-43825

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.

Published

2022-02-22T23:15:10.890

Last Modified

2024-11-21T06:29:52.517

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 6.1 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
CWE-416

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	envoyproxy	envoy	< 1.18.6	Yes
Application	envoyproxy	envoy	< 1.19.3	Yes
Application	envoyproxy	envoy	< 1.20.2	Yes
Application	envoyproxy	envoy	< 1.21.1	Yes

References

https://github.com/envoyproxy/envoy/commit/148de954ed3585d8b4298b424aa24916d0de6136 Patch, Third Party Advisory ([email protected])
https://github.com/envoyproxy/envoy/security/advisories/GHSA-h69p-g6xg-mhhh Issue Tracking, Third Party Advisory ([email protected])
https://github.com/envoyproxy/envoy/commit/148de954ed3585d8b4298b424aa24916d0de6136 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/envoyproxy/envoy/security/advisories/GHSA-h69p-g6xg-mhhh Issue Tracking, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)