---
title: "CVE-2021-44790: Possible buffer overflow when parsing… | CubePath"
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…"
language: en
source: https://cubepath.com/security/cve/CVE-2021-44790
---

# CVE-2021-44790: Possible buffer overflow when parsing… | CubePath

## 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.

Official description from the CVE record, published by apache. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-44790)

## Key data

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.96840 (96.8% probability)

Percentile

99.9%

Scores of

Nov 10, 2026

Model

v2026.06.15

### Weakness (CWE)

CWE catalog version 5.0.

CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license.

- [CWE-787](https://cwe.mitre.org/data/definitions/787.html) Out-of-bounds Write

## Affected products

Products listed in the CVE record, as the CNA published them.

- Apache HTTP Server

  - affected: Apache HTTP Server 2.4 up to 2.4.51

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [httpd.apache.org/security/vulnerabilities\_24.html](http://httpd.apache.org/security/vulnerabilities%5F24.html)
- [\[oss-security\] 20211220 CVE-2021-44790: Apache HTTP Server: Possible buffer overflow when parsing multipart content in mod\_lua of Apache HTTP Server 2.4.51 and earlier](http://www.openwall.com/lists/oss-security/2021/12/20/4)  (openwall.com) mailing-list
- [FEDORA-2021-29a536c2ae](https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BFSWOH4X77CV7AH7C4RMHUBDWKQDL4YH/)  (lists.fedoraproject.org) vendor-advisory
- [DSA-5035](https://www.debian.org/security/2022/dsa-5035)  (debian.org) vendor-advisory
- [oracle.com/security-alerts/cpujan2022.html](https://www.oracle.com/security-alerts/cpujan2022.html)
- [security.netapp.com/advisory/ntap-20211224-0001](https://security.netapp.com/advisory/ntap-20211224-0001/)
- [tenable.com/security/tns-2022-01](https://www.tenable.com/security/tns-2022-01)
- [tenable.com/security/tns-2022-03](https://www.tenable.com/security/tns-2022-03)
- [FEDORA-2022-b4103753e9](https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGWILBORT67SHMSLYSQZG2NMXGCMPUZO/)  (lists.fedoraproject.org) vendor-advisory
- [FEDORA-2022-21264ec6db](https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z7H26WJ6TPKNWV3QKY4BHKUKQVUTZJTD/)  (lists.fedoraproject.org) vendor-advisory
- [FEDORA-2022-78e3211c55](https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X73C35MMMZGBVPQQCH7LQZUMYZNQA5FO/)  (lists.fedoraproject.org) vendor-advisory
- [oracle.com/security-alerts/cpuapr2022.html](https://www.oracle.com/security-alerts/cpuapr2022.html)
- [support.apple.com/kb/HT213257](https://support.apple.com/kb/HT213257)
- [support.apple.com/kb/HT213256](https://support.apple.com/kb/HT213256)
- [support.apple.com/kb/HT213255](https://support.apple.com/kb/HT213255)
- [20220516 APPLE-SA-2022-05-16-4 Security Update 2022-004 Catalina](http://seclists.org/fulldisclosure/2022/May/33)  (seclists.org) mailing-list
- [20220516 APPLE-SA-2022-05-16-3 macOS Big Sur 11.6.6](http://seclists.org/fulldisclosure/2022/May/35)  (seclists.org) mailing-list
- [20220516 APPLE-SA-2022-05-16-2 macOS Monterey 12.4](http://seclists.org/fulldisclosure/2022/May/38)  (seclists.org) mailing-list
- [GLSA-202208-20](https://security.gentoo.org/glsa/202208-20)  (security.gentoo.org) vendor-advisory
- [packetstormsecurity.com/files/171631/Apache-2.4.x-Buffer-Ov…](http://packetstormsecurity.com/files/171631/Apache-2.4.x-Buffer-Overflow.html)

## Timeline

1. ID reserved Dec 10, 2021
2. Record published Dec 20, 2021
3. Record last updated Aug 4, 2024

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## About CubePath

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:05 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)