Back to Database
Status published
High
CVE-2021-34798
NULL pointer dereference in httpd core
Vulnerability Description
Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 and earlier.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
THREAT MONITOR
Am I Vulnerable?
Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2021-34798
Credits & Attribution
The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:
- The issue was discovered by the Apache HTTP security team
References
- http://httpd.apache.org/security/vulnerabilities_24.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/
- https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.httpd.apache.org%3E
- https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.httpd.apache.org%3E
- https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3E
- https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3E
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/
- https://lists.debian.org/debian-lts-announce/2021/10/msg00001.html
- https://www.debian.org/security/2021/dsa-4982
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.tenable.com/security/tns-2021-17
- https://security.netapp.com/advisory/ntap-20211008-0004/
- https://kc.mcafee.com/corporate/index?page=content&id=SB10379
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf
- https://security.gentoo.org/glsa/202208-20
More from Apache Software Foundation
View All →CVE-2025-69233
Apache CloudStack: Domain/account resources limits not honored
Medium
6.5
CVE-2025-69219
Apache Airflow Providers Http: Unsafe Pickle Deserialization in apache-airflow-providers-http leading to RCE via HttpOperator
Unknown
0
CVE-2025-68675
Apache Airflow: proxy credentials for various providers might leak in task logs
Unknown
0
CVE-2025-68637
Apache Uniffle: Insecure SSL Configuration in Uniffle HTTP Client
Unknown
0
CVE-2025-68493
Apache Struts, Apache Struts: XXE vulnerability in outdated XWork component
Unknown
0
Affected Vendor
Apache Software Foundation
View all reports →Affected Software
Apache HTTP Server
Vulnerable Versions:
Apache HTTP Server 2.4
Timeline
Official Publish:
September 16th, 2021
Last Modified:
August 4th, 2024
Added to House:
July 21st, 2026
CVSS Vectors
V3:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H