CVE-2022-31081Network attack vector

Request smuggling via divergent Content-Length parsing

Published Jun 27, 2022 · Updated Apr 22, 2025

HTTP request smuggling in libwww-perl HTTP::Daemon before 6.15 allows remote attackers to access protected APIs or poison caches. get_request accepts multiple Content-Length values without requiring every value to be numeric and identical, so HTTP agents can disagree on request boundaries. Exposure requires an application to serve requests through this Perl class, which is commonly used for local development and testing.

CVSS severity7.3
High
EPSS probability2.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTTP request smuggling in libwww-perl HTTP::Daemon before 6.15 allows remote attackers to access protected APIs or poison caches. get_request accepts multiple Content-Length values without requiring every value to be numeric and identical, so HTTP agents can disagree on request boundaries. Exposure requires an application to serve requests through this Perl class, which is commonly used for local development and testing.

The record

CVE
CVE-2022-31081
Published
Jun 27, 2022
Updated
Apr 22, 2025
Vendor
libwww-perl
Product
HTTP::Daemon
Classifications
CWE-444, CAPEC-33, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 27, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=< 6.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

libwww-perl · HTTP::Daemonversion=< 6.15

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
6.4NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:N
7.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CAPEC-33HTTP Request Smuggling
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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