BIT-envoy-2025-62409

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    BIT-envoy-2025-62409

    Published: 21 Oct 2025Last Modified: 10 Sept 2026

    Summary: Envoy allows large requests and responses to cause TCP connection pool crash

    Details: Envoy is a cloud-native, open source edge and service proxy. Prior to 1.36.1, 1.35.5, 1.34.9, and 1.33.10, large requests and responses can potentially trigger TCP connection pool crashes due to flow control management in Envoy. It will happen when the connection is closing but upstream data is still coming, resulting in a buffer watermark callback nullptr reference. The vulnerability impacts TCP proxy and HTTP 1 & 2 mixed use cases based on ALPN. This vulnerability is fixed in 1.36.1, 1.35.5, 1.34.9, and 1.33.10.

    References: https://github.com/envoyproxy/envoy/security/advisories/GHSA-pq33-4jxh-hgm3, https://nvd.nist.gov/vuln/detail/CVE-2025-62409

    Affected packages

    Package

    Name: envoy

    Purl: pkg:bitnami/envoy

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0
    Fixed -1.33.10

    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-2025-62409 | CVE-DB