CVE-2022-27664Network attack vector

Service hang via stale HTTP/2 GOAWAY status

Published Sep 6, 2022 · Updated Aug 3, 2024

Denial of service in Go net/http before 1.18.6 and 1.19.0 allows remote attackers to hang HTTP/2 server connections. serverConn.goAway retains a clean ErrCodeNo state instead of replacing it when a later fatal protocol error occurs after GOAWAY. Remote attackers need no credentials and can send GOAWAY followed by an invalid connection-level WINDOW_UPDATE, leaving the server waiting indefinitely for clean shutdown and interrupting service.

CVSS severity7.5
High
EPSS probability3.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Go net/http before 1.18.6 and 1.19.0 allows remote attackers to hang HTTP/2 server connections. serverConn.goAway retains a clean ErrCodeNo state instead of replacing it when a later fatal protocol error occurs after GOAWAY. Remote attackers need no credentials and can send GOAWAY followed by an invalid connection-level WINDOW_UPDATE, leaving the server waiting indefinitely for clean shutdown and interrupting service.

The record

CVE
CVE-2022-27664
Published
Sep 6, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 6, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

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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

T1499.004Application or System Exploitation

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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