UBUNTU-CVE-2020-11080

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    UBUNTU-CVE-2020-11080

    Published: 3 Jun 2020Last Modified: 22 Apr 2026
    Upstream:
    CVE-2020-11080
    Aliases:
    USN-6142-1

    Summary:

    Details: In nghttp2 before version 1.41.0, the overly large HTTP/2 SETTINGS frame payload causes denial of service. The proof of concept attack involves a malicious client constructing a SETTINGS frame with a length of 14,400 bytes (2400 individual settings entries) over and over again. The attack causes the CPU to spike at 100%. nghttp2 v1.41.0 fixes this vulnerability. There is a workaround to this vulnerability. Implement nghttp2_on_frame_recv_callback callback, and if received frame is SETTINGS frame and the number of settings entries are large (e.g., > 32), then drop the connection.

    References: https://ubuntu.com/security/CVE-2020-11080, https://nodejs.org/en/blog/vulnerability/june-2020-security-releases/#http-2-large-settings-frame-dos-low-cve-2020-11080, https://github.com/nghttp2/nghttp2/commit/336a98feb0d56b9ac54e12736b18785c27f75090, https://github.com/nghttp2/nghttp2/commit/f8da73bd042f810f34d19f9eae02b46d870af394, https://github.com/nghttp2/nghttp2/security/advisories/GHSA-q5wr-xfw9-q7xr, https://ubuntu.com/security/notices/USN-6142-1, https://www.cve.org/CVERecord?id=CVE-2020-11080

    Affected packages

    Package

    Name: nghttp2

    Purl: pkg:deb/ubuntu/[email protected]~esm1?arch=source&distro=esm-apps/xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.7.1-1ubuntu0.1~esm1

    Affected versions

    0.6.7-1

    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
    UBUNTU-CVE-2020-11080 | CVE-DB