THREATPORT/VULNERABILITY/CVE-2020-11080
LOW SEVERITY

CVE-2020-11080

Nghttp2 vulnerability

CVSS
3.7
EPSS
5.3%
EPSS pct
92th
Exploited
No known
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 vendor
Nghttp2
Affected product
Nghttp2
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness type (CWE)
Published
2020-06-03

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, high attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to low impact to availability.

Its EPSS score of 5.3% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 92% of all scored CVEs.

Check your external exposure to CVE-2020-11080

  • Confirm whether Nghttp2 Nghttp2 is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2020-11080.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2020-11080

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2020-11080 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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