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CVE-2020-11080

Denial of service in nghttp2

HIGH
7.5
CVSS Score
Published: June 3, 2020 at 12:00 AM UTC
Updated: June 17, 2026 at 02:49 AM UTC
10 products affected across 6 vendorsDebian LinuxFedoraLeap

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Severity
HIGH7.5
Exploit prediction
EPSS 5%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux· Debiandrupal
95%
10.09.0
Fedora· Fedora Projectrpm
95%
3133
NGHTTP2· NGHTTP2
95%
v < 1.41.0
Affected range stops below 1.41.0, so it looks safe — our inference, not a vendor statement
Node.js· Node.js
95%
10.0.0 ≤ v ≤ 10.12.010.13.0 ≤ v < 10.21.012.0.0 ≤ v ≤ 12.12.012.13.0 ≤ v < 12.18.014.0.0 ≤ v ≤ 14.4.0
Affected range stops below 10.21.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.18.0, so it looks safe — our inference, not a vendor statement
Leap· openSUSEdrupal
95%
15.1
Banking Extensibility Workbench· Oracle
95%
14.3.014.4.0
Blockchain Platform· Oracledrupal
95%
v < 21.1.2
Affected range stops below 21.1.2, so it looks safe — our inference, not a vendor statement
Enterprise Communications Broker· Oracle
95%
3.1.03.2.0
GraalVM· Oracle
95%
19.3.220.1.0
MySQL Server· Oraclenpm
95%
7.3.0 ≤ v ≤ 7.3.307.4.0 ≤ v ≤ 7.4.297.5.0 ≤ v ≤ 7.5.197.6.0 ≤ v ≤ 7.6.158.0.0 ≤ v ≤ 8.0.21

References (14)

Vendor AdvisoryMailing ListThird Party Advisory
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00024.html
PatchThird Party Advisory
Source: [email protected]
https://github.com/nghttp2/nghttp2/commit/336a98feb0d56b9ac54e12736b18785c27f75090
PatchThird Party Advisory
Source: [email protected]
https://github.com/nghttp2/nghttp2/commit/f8da73bd042f810f34d19f9eae02b46d870af394
PatchThird Party Advisory
Source: [email protected]
https://github.com/nghttp2/nghttp2/security/advisories/GHSA-q5wr-xfw9-q7xr
Mailing ListThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2021/10/msg00011.html
Mailing List
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2023/10/msg00023.html
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4OOYAMJVLLCLXDTHW3V5UXNULZBBK4O6/
Vendor Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AAC2AA36OTRHKSVM5OV7TTVB3CZIGEFL/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-707CWE-400

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