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Fencer Vulns
high 7.3

CVE-2022-31081 json

Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') in HTTP::Daemon

published 2022-06-27 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-52739

cvss
7.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.4%
EPSS 2.4% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

HTTP::Daemon is a simple http server class written in perl. Versions prior to 6.15 are subject to a vulnerability which could potentially be exploited to gain privileged access to APIs or poison intermediate caches. It is uncertain how large the risks are, most Perl based applications are served on top of Nginx or Apache, not on the `HTTP::Daemon`. This library is commonly used for local development and tests. Users are advised to update to resolve this issue. Users unable to upgrade may add additional request handling logic as a mitigation. After calling `my $rqst = $conn->get_request()` one could inspect the returned `HTTP::Request` object. Querying the 'Content-Length' (`my $cl = $rqst->header('Content-Length')`) will show any abnormalities that should be dealt with by a `400` response. Expected strings of 'Content-Length' SHOULD consist of either a single non-negative integer, or, a comma separated repetition of that number. (that is `42` or `42, 42, 42`). Anything else MUST be rejected.

Patch / fix

  • http::daemon_project http::daemon 6.15
  • libhttp-daemon-perl Debian 14, Debian 13, Debian 12 6.14-1.1

debian advisories DEBIAN-CVE-2022-31081

  • libhttp-daemon-perl Ubuntu 18.04 LTS 6.01-1ubuntu0.1
  • libhttp-daemon-perl Ubuntu 20.04 LTS 6.06-1ubuntu0.1
  • libhttp-daemon-perl Ubuntu 22.04 LTS 6.13-1ubuntu0.1
  • libhttp-daemon-perl Ubuntu Pro 14.04 LTS 6.01-1ubuntu0.14.04~esm1
  • libhttp-daemon-perl Ubuntu Pro 16.04 LTS 6.01-1ubuntu0.16.04~esm1

ubuntu advisories UBUNTU-CVE-2022-31081

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • perl-HTTP-Daemon SLE Module for Basesystem 15 SP4, SLE Module for Basesystem 15 SP3, openSUSE Leap 15.4 +1 more 6.01-150000.3.5.1
  • perl-HTTP-Daemon SLES for SAP 12 SP5, SLES 12 SP5 6.01-9.5.1

suse advisories SUSE-SU-2022:2874-1SUSE-SU-2022:2872-1

  • perl-HTTP-Daemon openSUSE Tumbleweed 6.14-2.1

opensuse advisories openSUSE-SU-2024:12216-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-31081 updated cvss 6.5

perl-HTTP-Daemon: HTTP:: Daemon allows request smuggling

  • Red Hat Enterprise Linux 7 perl-HTTP-Daemon
    affected: no fix planned “Out of support scope”
  • Red Hat Software Collections rh-perl530-perl-HTTP-Daemon
    affected: no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

2.35% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • portswigger.net https://portswigger.net/research/http-desync-attacks-request-smuggling-reborn referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:P/A:N

Affected products

  • libwww-perl HTTP-Daemon

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.