CVE-2020-11080
LOWEPSS 92th pctlDescription
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.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Exploit Intelligence
High risk: more likely to be exploited than 92% of all known CVEs.
References
Related Vulnerabilities
Other CWE-707 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2024-10914 | High | 8.1 | 96% | - | - |
| CVE-2024-10915 | High | 8.1 | 79% | - | - |
| CVE-2024-43572 | High | 7.8 | 67% | KEV | Fix |
| CVE-2022-4257 | Medium | 6.3 | 44% | - | - |
| CVE-2025-26633 | High | 7.0 | 30% | KEV + Ransom | Fix |
| CVE-2022-3801 | Medium | 6.3 | 30% | - | - |
Common questions
How do I fix CVE-2020-11080?
Published advisories record a fix for 9 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.
Is CVE-2020-11080 being actively exploited?
Not that we know of. CVE-2020-11080 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 5.3% is the estimated probability that it will be exploited in the next 30 days. That is higher than 92% of all scored CVEs.
How severe is CVE-2020-11080?
CVE-2020-11080 has a CVSS v3 base score of 3.7, rated low. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2020-11080 affect?
Published advisories record a fix for nghttp2 (Debian), libnghttp2-14 (Ubuntu), libnghttp2-dev (Ubuntu), nghttp2 (Ubuntu), and 5 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.