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Vulnerability Details : CVE-2021-32781

Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions after Envoy sends a locally generated response it must stop further processing of request or response data. However when local response is generated due the internal buffer overflow while request or response is processed by the filter chain the operation may not be stopped completely and result in accessing a freed memory block. A specifically constructed request delivered by an untrusted downstream or upstream peer in the presence of extensions that modify and increase the size of request or response bodies resulting in a Denial of Service when using extensions that modify and increase the size of request or response bodies, such as decompressor filter. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to address incomplete termination of request processing after locally generated response. As a workaround disable Envoy's decompressor, json-transcoder or grpc-web extensions or proprietary extensions that modify and increase the size of request or response bodies, if feasible.
Publish Date : 2021-08-24 Last Update Date : 2022-07-02
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- CVSS Scores & Vulnerability Types

CVSS Score
5.0
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of ServiceOverflow
CWE ID 120

- Products Affected By CVE-2021-32781

# Product Type Vendor Product Version Update Edition Language
1 Application Envoyproxy Envoy * * * * Version Details Vulnerabilities
2 Application Envoyproxy Envoy 1.19.0 * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Envoyproxy Envoy 2

- References For CVE-2021-32781

https://github.com/envoyproxy/envoy/security/advisories/GHSA-5vhv-gp9v-42qv CONFIRM
https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history

- Metasploit Modules Related To CVE-2021-32781

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)
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