CVE-2022-41717Network attack vector

Service interruption via oversized HTTP/2 header keys

Published Dec 8, 2022 · Updated Feb 13, 2025

Uncontrolled resource consumption in Go HTTP/2 servers allows remote attackers to interrupt service with oversized header keys. The per-connection header-key cache caps entry count but retains attacker-sized keys, allowing one connection to allocate about 64 MiB. Exposure requires an HTTP/2 server reachable by the attacker; multiple open connections can drive excessive memory growth and halt service.

CVSS severity5.3
Medium
EPSS probability5.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Go HTTP/2 servers allows remote attackers to interrupt service with oversized header keys. The per-connection header-key cache caps entry count but retains attacker-sized keys, allowing one connection to allocate about 64 MiB. Exposure requires an HTTP/2 server reachable by the attacker; multiple open connections can drive excessive memory growth and halt service.

The record

CVE
CVE-2022-41717
Published
Dec 8, 2022
Updated
Feb 13, 2025
Vendor
Go standard library
Product
net/http
Classifications
CWE-770, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 8, 2022CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.18.9
  2. Affected versionversion=1.19.0-0 <1.19.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · net/httpversion=0 <1.18.9; version=1.19.0-0 <1.19.4
golang.org/x/net · golang.org/x/net/http2version=0 <0.4.0

Published CVSS scores

5.3GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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