---
title: "CVE-2021-34798: NULL pointer dereference in httpd core | CubePath"
description: "Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 and earlier."
language: en
source: https://cubepath.com/security/cve/CVE-2021-34798
---

# CVE-2021-34798: NULL pointer dereference in httpd core | CubePath

## Description

Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 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-2021-34798)

## 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

0.64509 (64.5% probability)

Percentile

99.2%

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-476](https://cwe.mitre.org/data/definitions/476.html) NULL Pointer Dereference

## Affected products

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

- Apache HTTP Server

  - affected: Apache HTTP Server 2.4 up to 2.4.48

## 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)
- [FEDORA-2021-dce7e7738e](https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/)  (lists.fedoraproject.org) vendor-advisory
- [\[httpd-users\] 20210923 \[users@httpd\] 2.4.49 security fixes: more info](https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.httpd.apache.org%3E)  (lists.apache.org) mailing-list
- [\[httpd-users\] 20210923 Re: \[users@httpd\] 2.4.49 security fixes: more info](https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.httpd.apache.org%3E)  (lists.apache.org) mailing-list
- [\[httpd-users\] 20210923 \[users@httpd\] Re: \[External\] : \[users@httpd\] 2.4.49 security fixes: more info](https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3E)  (lists.apache.org) mailing-list
- [\[httpd-users\] 20210923 Re: \[users@httpd\] Re: \[External\] : \[users@httpd\] 2.4.49 security fixes: more info](https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3E)  (lists.apache.org) mailing-list
- [FEDORA-2021-e3f6dd670d](https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/)  (lists.fedoraproject.org) vendor-advisory
- [\[debian-lts-announce\] 20211002 \[SECURITY\] \[DLA 2776-1\] apache2 security update](https://lists.debian.org/debian-lts-announce/2021/10/msg00001.html)  (lists.debian.org) mailing-list
- [DSA-4982](https://www.debian.org/security/2021/dsa-4982)  (debian.org) vendor-advisory
- [20211124 Multiple Vulnerabilities in Apache HTTP Server Affecting Cisco Products: November 2021](https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ)  (tools.cisco.com) vendor-advisory
- [oracle.com/security-alerts/cpujan2022.html](https://www.oracle.com/security-alerts/cpujan2022.html)
- [tenable.com/security/tns-2021-17](https://www.tenable.com/security/tns-2021-17)
- [security.netapp.com/advisory/ntap-20211008-0004](https://security.netapp.com/advisory/ntap-20211008-0004/)
- [kc.mcafee.com/corporate/index?page=content&id=SB10379](https://kc.mcafee.com/corporate/index?page=content&id=SB10379)
- [oracle.com/security-alerts/cpuapr2022.html](https://www.oracle.com/security-alerts/cpuapr2022.html)
- [cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf](https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf)
- [GLSA-202208-20](https://security.gentoo.org/glsa/202208-20)  (security.gentoo.org) vendor-advisory

## Timeline

1. ID reserved Jun 16, 2021
2. Record published Sep 16, 2021
3. Record last updated Aug 4, 2024

## Look up another CVE

## About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.

[Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection)

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)