CVE-2022-3252Network attack vector

Process hang via trailing compressed-body data

Published Sep 21, 2022 · Updated Aug 3, 2024

Denial of service in Swift Project SwiftNIO Extras before 1.14.0 allows remote attackers to hang a process via a compressed HTTP message. HTTPRequestDecompressor and HTTPResponseDecompressor continue feeding trailing bytes to zlib after it reports the body complete, repeatedly allocating buffers without advancing input. Reachability requires an application to enable transparent response decompression, or the less common request decompression configuration; one crafted message leaves the process unavailable until intervention.

CVSS severity7.5
High
EPSS probability0.76%
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 Extras before 1.14.0 allows remote attackers to hang a process via a compressed HTTP message. HTTPRequestDecompressor and HTTPResponseDecompressor continue feeding trailing bytes to zlib after it reports the body complete, repeatedly allocating buffers without advancing input. Reachability requires an application to enable transparent response decompression, or the less common request decompression configuration; one crafted message leaves the process unavailable until intervention.

The record

CVE
CVE-2022-3252
Published
Sep 21, 2022
Updated
Aug 3, 2024
Vendor
Swift Project
Product
SwiftNIO Extras
Classifications
CWE-835, CWE-606, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 21, 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=unspecified <1.14.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Swift Project · SwiftNIO Extrasversion=unspecified <1.14.0

Published CVSS scores

7.5Swift ProjectCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NISTCVSS: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.

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

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
CWE-606Unchecked Input for Loop Condition
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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