CVE-2022-24668Public exploitNetwork attack vector

Service crash via unsupported HTTP/2 frames

Published Feb 9, 2022 · Updated Aug 3, 2024

Denial of service in Swift Project SwiftNIO HTTP/2 1.0.0 through 1.19.1 allows remote attackers to crash applications via ALTSVC or ORIGIN frames. NIOHTTP2Handler sends these parsed, unsupported inbound frame types to a fatal trap instead of ignoring the noncritical extensions. Any HTTP/2 connection peer can trigger the immediate process crash, terminating in-flight connections until the service restarts.

CVSS severity7.5
High
EPSS probability1.12%
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 Swift Project SwiftNIO HTTP/2 1.0.0 through 1.19.1 allows remote attackers to crash applications via ALTSVC or ORIGIN frames. NIOHTTP2Handler sends these parsed, unsupported inbound frame types to a fatal trap instead of ignoring the noncritical extensions. Any HTTP/2 connection peer can trigger the immediate process crash, terminating in-flight connections until the service restarts.

The record

CVE
CVE-2022-24668
Published
Feb 9, 2022
Updated
Aug 3, 2024
Vendor
Swift Project
Product
SwiftNIO HTTP/2
Classifications
CWE-241, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 9, 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?

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

  1. Affected versionversion=1.0.0 <unspecified
  2. Affected versionversion=unspecified <=1.19.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Swift Project · SwiftNIO HTTP/2version=1.0.0 <unspecified; version=unspecified <=1.19.1

Published CVSS scores

7.5Swift ProjectCVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-241Improper Handling of Unexpected Data Type
T1499.004Application or System Exploitation

Public exploit references

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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