Vulnerability Intelligence Report
Denial of service in nghttp2
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.
No Active Exploit Signals
CVSS Base Score
3.7
LOW
Exploitability:2.3
Impact Score:1.5
EPSS Probability:5.32%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
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SSVC Action
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Weaknesses (CWE)
CWE-707 ↗CWE-707 Improper Enforcement of Message or Data Structure
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| nghttp2 | nghttp2 | < 1.41.0 (affected) |
Threat Intelligence Signals
EPSS Score
5.316%
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | GitHub, Inc. · Vendor · USA |
| Reserved | 2020-03-30T00:00:00 |
| Published | 2020-06-03T00:00:00 |
| Last Updated | 2025-06-09T15:45:50 |
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