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Vulnerability Details : CVE-2021-32780

Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions Envoy transitions a H/2 connection to the CLOSED state when it receives a GOAWAY frame without any streams outstanding. The connection state is transitioned to DRAINING when it receives a SETTING frame with the SETTINGS_MAX_CONCURRENT_STREAMS parameter set to 0. Receiving these two frames in the same I/O event results in abnormal termination of the Envoy process due to invalid state transition from CLOSED to DRAINING. A sequence of H/2 frames delivered by an untrusted upstream server will result in Denial of Service in the presence of untrusted **upstream** servers. Envoy versions 1.19.1, 1.18.4 contain fixes to stop processing of pending H/2 frames after connection transition to the CLOSED state.
Publish Date : 2021-08-24 Last Update Date : 2022-06-15
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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 Service
CWE ID 754

- Products Affected By CVE-2021-32780

# 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-2021-32780

https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history
https://github.com/envoyproxy/envoy/security/advisories/GHSA-j374-mjrw-vvp8 CONFIRM

- Metasploit Modules Related To CVE-2021-32780

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