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    CVE-2020-11080

    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.

    Published:Jun 2, 2020
    Last Modified:Jun 9, 2025
    EPS:Jun 3, 2020
    EPSS Score:0.00566
    CVSS Score:3.7

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Nghttp2
    Product
    Nghttp2
    Vendor
    Nodejs
    Product
    Node.js
    Vendor
    Opensuse
    Product
    Leap
    Vendor
    Oracle
    Product
    Banking Extensibility Workbench
    Vendor
    Oracle
    Product
    Blockchain Platform
    Vendor
    Oracle
    Product
    Enterprise Communications Broker
    Vendor
    Oracle
    Product
    Graalvm
    Vendor
    Oracle
    Product
    Mysql
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Jboss Core Services
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Software Collections
    Vendor
    Redhat
    Product
    Service Mesh

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-125 Flooding
    CAPEC-130 Excessive Allocation
    CAPEC-147 XML Ping of the Death
    CAPEC-197 Exponential Data Expansion
    CAPEC-227 Sustained Client Engagement
    CAPEC-229 Serialized Data Parameter Blowup
    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads
    CAPEC-250 XML Injection
    CAPEC-276 Inter-component Protocol Manipulation
    CAPEC-277 Data Interchange Protocol Manipulation
    CAPEC-278 Web Services Protocol Manipulation
    CAPEC-279 SOAP Manipulation
    CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-468 Generic Cross-Browser Cross-Domain Theft
    CAPEC-469 HTTP DoS
    CAPEC-482 TCP Flood
    CAPEC-486 UDP Flood
    CAPEC-487 ICMP Flood
    CAPEC-488 HTTP Flood
    CAPEC-489 SSL Flood
    CAPEC-490 Amplification
    CAPEC-491 Quadratic Data Expansion
    CAPEC-492 Regular Expression Exponential Blowup
    CAPEC-493 SOAP Array Blowup
    CAPEC-494 TCP Fragmentation
    CAPEC-495 UDP Fragmentation
    CAPEC-496 ICMP Fragmentation
    CAPEC-52 Embedding NULL Bytes
    CAPEC-528 XML Flood
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-7 Blind SQL Injection
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding
    CAPEC-83 XPath Injection
    CAPEC-84 XQuery Injection

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    References

    http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00024.html
    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://lists.debian.org/debian-lts-announce/2021/10/msg00011.html
    https://lists.debian.org/debian-lts-announce/2023/10/msg00023.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4OOYAMJVLLCLXDTHW3V5UXNULZBBK4O6/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AAC2AA36OTRHKSVM5OV7TTVB3CZIGEFL/
    https://www.debian.org/security/2020/dsa-4696
    https://www.oracle.com//security-alerts/cpujul2021.html
    https://www.oracle.com/security-alerts/cpuapr2022.html
    https://www.oracle.com/security-alerts/cpujan2021.html
    https://www.oracle.com/security-alerts/cpujul2020.html
    https://www.oracle.com/security-alerts/cpuoct2020.html
    http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00024.html
    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://lists.debian.org/debian-lts-announce/2021/10/msg00011.html
    https://lists.debian.org/debian-lts-announce/2023/10/msg00023.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4OOYAMJVLLCLXDTHW3V5UXNULZBBK4O6/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AAC2AA36OTRHKSVM5OV7TTVB3CZIGEFL/
    https://www.debian.org/security/2020/dsa-4696
    https://www.oracle.com//security-alerts/cpujul2021.html
    https://www.oracle.com/security-alerts/cpuapr2022.html
    https://www.oracle.com/security-alerts/cpujan2021.html
    https://www.oracle.com/security-alerts/cpujul2020.html
    https://www.oracle.com/security-alerts/cpuoct2020.html

    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