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7.5
HIGH CVSS 3.1
CVE-2021-43825
Use-after-free in Envoy
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.

INFO

Published Date :

Feb. 22, 2022, 11:15 p.m.

Last Modified :

Nov. 21, 2024, 6:29 a.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Affected Products

The following products are affected by CVE-2021-43825 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Envoyproxy envoy
: Total Affected Vendor : 1 | Products : 1
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 2.0 MEDIUM [email protected]
CVSS 3.1 MEDIUM [email protected]
CVSS 3.1 HIGH [email protected]
Solution
A buffer overflow vulnerability in Envoy may lead to a denial of service.
  • Update the Red Hat OpenShift Service Mesh package to address the vulnerability.
  • Consult the vendor's security advisory for specific update instructions.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-43825.

URL Resource
https://github.com/envoyproxy/envoy/commit/148de954ed3585d8b4298b424aa24916d0de6136 Patch Third Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-h69p-g6xg-mhhh Issue Tracking Third Party Advisory
https://github.com/envoyproxy/envoy/commit/148de954ed3585d8b4298b424aa24916d0de6136 Patch Third Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-h69p-g6xg-mhhh Issue Tracking Third Party Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-43825 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-43825 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-43825 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2021-43825 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://github.com/envoyproxy/envoy/commit/148de954ed3585d8b4298b424aa24916d0de6136
    Added Reference https://github.com/envoyproxy/envoy/security/advisories/GHSA-h69p-g6xg-mhhh
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Initial Analysis by [email protected]

    Mar. 02, 2022

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:N/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Changed Reference Type https://github.com/envoyproxy/envoy/commit/148de954ed3585d8b4298b424aa24916d0de6136 No Types Assigned https://github.com/envoyproxy/envoy/commit/148de954ed3585d8b4298b424aa24916d0de6136 Patch, Third Party Advisory
    Changed Reference Type https://github.com/envoyproxy/envoy/security/advisories/GHSA-h69p-g6xg-mhhh No Types Assigned https://github.com/envoyproxy/envoy/security/advisories/GHSA-h69p-g6xg-mhhh Issue Tracking, Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* versions up to (excluding) 1.18.6 *cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* versions from (including) 1.19.0 up to (excluding) 1.19.3 *cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* versions from (including) 1.20.0 up to (excluding) 1.20.2 *cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* versions from (including) 1.21.0 up to (excluding) 1.21.1
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 7.5
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact
Base CVSS Score: 5
Access Vector
Access Complexity
Authentication
Confidentiality Impact
Integrity Impact
Availability Impact
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.10 }} 0.00%

score

0.27590

percentile