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No exploitation reportedFix available

CVE-2022-22721

No exploitation reported by the sources we read.

  • Published2022-03-14
  • WeaknessCWE-190

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

If LimitXMLRequestBody is set to allow request bodies larger than 350MB (defaults to 1M) on 32 bit systems an integer overflow happens which later causes out of bounds writes. This issue affects Apache HTTP Server 2.4.52 and earlier.

Timeline

dates in UTC
  1. 2022-03-1411:15CVE publishedNVD
  2. 2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Versions per branch

NVD
Apache HTTP Server
BranchAffectedFixed in
2.4≤ 2.4.52no fix published
Fedoraproject fedora
BranchAffectedFixed in
34.x= 34no fix published
35.x= 35no fix published
36.x= 36no fix published
Apple mac os x
BranchAffectedFixed in
10.15≥ 10.15, < 10.15.710.15.7
10.15= 10.15.7no fix published

6 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • apacheMageia:8all versions · fixed in 2.4.53-1.mga8
  • apache2Ubuntu:Pro:16.04:LTSall versions · fixed in 2.4.18-2ubuntu3.17+esm5
  • apache2Ubuntu:Pro:14.04:LTSall versions · fixed in 2.4.7-1ubuntu4.22+esm4
  • apache2Ubuntu:22.04:LTSall versions · fixed in 2.4.52-1ubuntu2
  • apache2Ubuntu:20.04:LTSall versions · fixed in 2.4.41-4ubuntu3.10
  • apache2Ubuntu:18.04:LTSall versions · fixed in 2.4.29-1ubuntu4.22
  • apache2TuxCare:Ubuntu:16.04all versions · fixed in 1:2.4.18-2ubuntu3.17+tuxcare.els4and 7 other packages
  • apache2SUSE:OpenStack Cloud Crowbar 9all versions · fixed in 2.4.23-29.88.1

111 more package ranges on OSV.dev

Vendor advisories

  • CVE-2022-22721 Red Hat Product Security224 products fixed · 22 known affected

    httpd: core: Possible buffer overflow with very large or unlimited LimitXMLRequestBody

    httpd as a component of Red Hat Enterprise Linux 6 · httpd-devel as a component of Red Hat Enterprise Linux 6 · httpd-manual as a component of Red Hat Enterprise Linux 6 · +19 more

  • RHSA-2022:8841 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.51 SP1 security update

  • RHSA-2022:8840 Red Hat Product Security27 products fixed

    Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.51 SP1 security update

  • RHSA-2022:8067 Red Hat Product Security75 products fixed

    Red Hat Security Advisory: httpd security, bug fix, and enhancement update

  • RHSA-2022:7647 Red Hat Product Security85 products fixed

    Red Hat Security Advisory: httpd:2.4 security update

  • RHSA-2022:6753 Red Hat Product Security36 products fixed

    Red Hat Security Advisory: httpd24-httpd security and bug fix update

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2022:8841 · 1 productFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  2. Vendor fix Red Hat Product Security RHSA-2022:8840 · 27 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Applications using the APR libraries, such as httpd, must be restarted for this update to take effect. After installing the updated packages, the http…
  3. Vendor fix Red Hat Product Security RHSA-2022:8067 · 75 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the updated packages, the httpd daemon will be restarted automatically.
  4. Workaround from the vendor Red Hat Product Security RHSA-2022:8841 · 1 productSet the LimitXMLRequestBody option to a value smaller than 350MB. Setting it to 0 is not recommended as it will use a hard limit (depending on 32bit or 64bit systems) which may result in an overall system out-of-memory. The default configuration is not vulnerable to this flaw, see the statement abo…
  5. No fix planned, says the vendor Red Hat Product Security CVE-2022-22721 · 22 productsOut of support scope

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.19.1read 2026-10-23
  • NVDCVSS 2.05.8read 2026-10-23
  • CNAweakness (CWE)CWE-190known since 2026-10-23
  • NVDweakness (CWE)CWE-190read 2026-10-23
  • FIRST EPSSEPSS score41.9 %read 2026-11-10
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Published
2022-03-14
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-24r7-x8mx-hc2h

Frequently asked questions

What is CVE-2022-22721?

If LimitXMLRequestBody is set to allow request bodies larger than 350MB (defaults to 1M) on 32 bit systems an integer overflow happens which later causes out of bounds writes. This issue affects Apache HTTP Server 2.4.52 and earlier.

Is CVE-2022-22721 actively exploited?

Active exploitation of CVE-2022-22721 has not been confirmed. Its EPSS score was 41.9% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2022-22721?

CVE-2022-22721 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.

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