Skip to main content
CRITICAL

CVE-2021-44790

CVSS v3

9.8

CRITICAL

EPSS Score

96.8 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Get an alert for each new CVE published for apache.

Set up CVE WatchFree account · no credit card

Affected and fixed versions

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

  • apacheBitnamiall versions · fixed in 2.4.52
  • httpdAlmaLinux:8all versions · fixed in 2.4.37-43.module_el8.5.0+2609+b30d9eec.1.almaand 6 other packages
  • mod_http2AlmaLinux:8all versions · fixed in 1.15.7-3.module_el8.5.0+2609+b30d9eec
  • mod_mdAlmaLinux:8all versions · fixed in 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa
  • mod_sslAlmaLinux:8all versions · fixed in 1:2.4.37-43.module_el8.5.0+2609+b30d9eec.1.almaand 1 other package

Vendor advisories

  • CVE-2021-44790 Red Hat Product Security508 products fixed · 7 known affected

    httpd: mod_lua: Possible buffer overflow when parsing multipart content

    httpd as a component of Red Hat JBoss Enterprise Application Platform 6 · httpd-devel as a component of Red Hat JBoss Enterprise Application Platform 6 · httpd-manual as a component of Red Hat JBoss Enterprise Application Platform 6

  • ICSA-22-132-02 CISA1 known affected

    Mitsubishi Electric MELSOFT iQ AppPortal

    MELSOFT iQ AppPortal (SW1DND-IQAPL-M): Versions 1.00A through 1.26C

  • RHSA-2022:1136 Red Hat Product Security42 products fixed

    Red Hat Security Advisory: httpd security update

  • RHSA-2022:1139 Red Hat Product Security11 products fixed

    Red Hat Security Advisory: httpd security update

  • RHSA-2022:1137 Red Hat Product Security42 products fixed

    Red Hat Security Advisory: httpd security update

  • RHSA-2022:1138 Red Hat Product Security11 products fixed

    Red Hat Security Advisory: httpd security update

4 more advisories

Full record on NVD

Description

A carefully crafted request body can cause a buffer overflow in the mod_lua multipart parser (r:parsebody() called from Lua scripts). The Apache httpd team is not aware of an exploit for the vulnerabilty though it might be possible to craft one. This issue affects Apache HTTP Server 2.4.51 and earlier.

Technical details

Published
2021-12-20
Exploit-DB
EDB-51193

Frequently asked questions

What is CVE-2021-44790?

A carefully crafted request body can cause a buffer overflow in the mod_lua multipart parser (r:parsebody() called from Lua scripts). The Apache httpd team is not aware of an exploit for the vulnerabilty though it might be possible to craft one. This issue affects Apache HTTP Server 2.4.51 and earlier.

Is CVE-2021-44790 actively exploited?

Active exploitation of CVE-2021-44790 has not been confirmed. Its EPSS score was 96.8% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-44790?

CVE-2021-44790 has a CVSS v3 base score of 9.8 (CRITICAL severity).

Running apache? Hear about its next vulnerability

CVE Watch matches each new CVE to the vendors and products you list (vendor and product, not the version) and puts it in your alerts with its KEV and EPSS status.

Get alerts for this productCISA KEV additions, October 2026Search CVEs

Already have an account? Open CVE WatchNo credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database