CVE-2019-9900

    Dashboard / Vulnerabilities / CVE-2019-9900

    CVE-2019-9900

    Published: 25 Apr 2019Last Modified: 7 Aug 2026

    Summary:

    Details: When parsing HTTP/1.x header values, Envoy 1.9.0 and before does not reject embedded zero characters (NUL, ASCII 0x0). This allows remote attackers crafting header values containing embedded NUL characters to potentially bypass header matching rules, gaining access to unauthorized resources.

    References: https://groups.google.com/forum/#%21topic/envoy-announce/VoHfnDqZiAM, https://access.redhat.com/errata/RHSA-2019:0741, https://www.envoyproxy.io/docs/envoy/v1.9.1/intro/version_history, https://github.com/envoyproxy/envoy/issues/6434, https://github.com/envoyproxy/envoy/security/advisories/GHSA-x74r-f4mw-c32h

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    v1.9.0

    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