Lucene search
+L
Catalog
Vendors
Products
Timeline
Vulnerabilities
Sources
Documentation
Blog
Glossary
FAQ
Brand assets
Assessment
Agents dashboard
Agent Scanning
API Scanning
Assessment API
Alerts
Email notifications
Webhook notifications
Alerts API
SBOM package analysis
API Reference
Settings
Sign in

CVE-2021-26691

🗓️ 10 Jun 2021 07:15:00Reported by AttackerKBType 
attackerkb
 attackerkb🔗 attackerkb.com👁 5 Views

CVE-2021-26691 affects Apache HTTP Server 2.4.0 to 2.4.46; SessionHeader causes heap overflow.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
ibm
IBM Security Bulletins		Security Bulletin: Multiple security vulnerabilities have been identified in IBM HTTP Server shipped with IBM Rational ClearCase (CVE-2020-13938, CVE-2021-30641, CVE-2021-26690, CVE-2021-26691)
16 Sep 202106:03
–ibm
ibm
IBM Security Bulletins		Security Bulletin: A security vulnerability has been identified in IBM WebSphere Application Server, which is a required product for IBM Tivoli Network Manager IP Edition (CVE-2021-26690, CVE-2021-26691)
2 Jul 202113:49
–ibm
ibm
IBM Security Bulletins		Security Bulletin: Multiple vulnerabilities in IBM HTTP Server used by WebSphere Application Server
28 Jun 202115:35
–ibm
ibm
IBM Security Bulletins		WebSphere Application Server and IBM HTTP Server Security Bulletin List
13 Jul 202218:04
–ibm
ibm
IBM Security Bulletins		Security Bulletin: A security vulnerability has been identified in IBM WebSphere Application Server, which is a required product for IBM Tivoli Network Manager IP Edition (CVE-2021-26690, CVE-2021-26691)
30 Jul 202105:03
–ibm
ibm
IBM Security Bulletins		Security Bulletin: Vulnerabilities have been identified in Spring Framework, OpenSSL and Apache HTTP Server shipped with the DS8000 Hardware Management Console (HMC)
3 Feb 202321:20
–ibm
ibm
IBM Security Bulletins		Security Bulletin: IBM Maximo Application Suite - IoT Component uses "Apache httpd 2.4" which is vulnerable to multiple CVEs
21 Mar 202506:40
–ibm
nessus
Tenable Nessus		Amazon Linux 2 : httpd (ALAS-2021-1659)
24 Jun 202100:00
–nessus
nessus
Tenable Nessus		Amazon Linux 2 : httpd (ALAS-2021-1674)
1 Jul 202100:00
–nessus
nessus
Tenable Nessus		Amazon Linux AMI : httpd24 (ALAS-2021-1514)
13 Jul 202100:00
–nessus
Rows per page
Vulners
Node
OR
apache_software_foundationapache_http_serverMatch2.4.46
apache_software_foundationapache_http_serverMatch2.4.43
apache_software_foundationapache_http_serverMatch2.4.41
apache_software_foundationapache_http_serverMatch2.4.39
apache_software_foundationapache_http_serverMatch2.4.38
apache_software_foundationapache_http_serverMatch2.4.37
apache_software_foundationapache_http_serverMatch2.4.35
apache_software_foundationapache_http_serverMatch2.4.34
apache_software_foundationapache_http_serverMatch2.4.33
apache_software_foundationapache_http_serverMatch2.4.29
apache_software_foundationapache_http_serverMatch2.4.28
apache_software_foundationapache_http_serverMatch2.4.27
apache_software_foundationapache_http_serverMatch2.4.26
apache_software_foundationapache_http_serverMatch2.4.25
apache_software_foundationapache_http_serverMatch2.4.23
apache_software_foundationapache_http_serverMatch2.4.20
apache_software_foundationapache_http_serverMatch2.4.18
apache_software_foundationapache_http_serverMatch2.4.17
apache_software_foundationapache_http_serverMatch2.4.16
apache_software_foundationapache_http_serverMatch2.4.12
apache_software_foundationapache_http_serverMatch2.4.10
apache_software_foundationapache_http_serverMatch2.4.9
apache_software_foundationapache_http_serverMatch2.4.7
apache_software_foundationapache_http_serverMatch2.4.6
apache_software_foundationapache_http_serverMatch2.4.4
apache_software_foundationapache_http_serverMatch2.4.3
apache_software_foundationapache_http_serverMatch2.4.2
apache_software_foundationapache_http_serverMatch2.4.1
apache_software_foundationapache_http_serverMatch2.4.0
SourceLink
listswww.lists.fedoraproject.org/archives/list/[email protected]/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/
debianwww.debian.org/security/2021/dsa-4937
listswww.lists.apache.org/thread.html/r50cae1b71f1e7421069036b213c26da7d8f47dd59874e3bd956959fe%40%3Cannounce.httpd.apache.org%3E
listswww.lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/
cvewww.cve.mitre.org/cgi-bin/cvename.cgi
securitywww.security.netapp.com/advisory/ntap-20210702-0001/
listswww.lists.fedoraproject.org/archives/list/[email protected]/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/
listswww.lists.apache.org/thread.html/r7f2b70b621651548f4b6f027552f1dd91705d7111bb5d15cda0a68dd@%3Cdev.httpd.apache.org%3E
securitywww.security.gentoo.org/glsa/202107-38
listswww.lists.debian.org/debian-lts-announce/2021/07/msg00006.html
Rows per page

Data

Build on a solid foundation with Vulners data

We provide the essential building blocks for cybersecurity solutions with comprehensive, structured, and constantly updated vulnerability and exploits data

Api

Power your application with Vulners API

The Vulners REST API offers reliable, high-performance access to vulnerability intelligence, with 99.9% SLA uptime and CDN-backed data delivery for seamless global access

App

Assess and manage vulnerabilities with Vulners tools

Built on top of Vulners' database and SDK, end-user solutions give security professionals and developers lightweight and powerful tools for vulnerability remediation

Book a live demo
24 Feb 2026 19:48Current
7.9High risk
Vulners AI Score7.9
CVSS 3.19.8
CVSS 27.5
EPSS0.68289
vulnerability 2021 26691apache serversession headerheap overflowversions 2.4.02.4.46
5