BIT-envoy-2021-32780

    Dashboard / Vulnerabilities / BIT-envoy-2021-32780

    BIT-envoy-2021-32780

    Published: 6 Mar 2024Last Modified: 8 Sept 2026

    Summary: Incorrect handling of H/2 GOAWAY followed by SETTINGS frames

    Details: 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.

    References: https://github.com/envoyproxy/envoy/security/advisories/GHSA-j374-mjrw-vvp8, https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history, https://nvd.nist.gov/vuln/detail/CVE-2021-32780

    Affected packages

    Package

    Name: envoy

    Purl: pkg:bitnami/envoy

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 1.18.0
    Fixed -1.18.4

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    BIT-envoy-2021-32780 | CVE-DB