// For flags

CVE-2021-26691

Apache HTTP Server mod_session response handling heap overflow

Severity Score

9.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server could cause a heap overflow

Apache HTTP Server versiones 2.4.0 a 2.4.46 , un parámetro SessionHeader especialmente diseñado enviado por un servidor de origen podría causar un desbordamiento de pila

A heap overflow flaw was found In Apache httpd mod_session. The highest threat from this vulnerability is to system availability.

*Credits: Discovered internally Christophe Jaillet
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-02-04 CVE Reserved
  • 2021-06-10 CVE Published
  • 2024-08-03 CVE Updated
  • 2024-11-13 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
  • CWE-122: Heap-based Buffer Overflow
  • CWE-787: Out-of-bounds Write
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Apache
Search vendor "Apache"
Http Server
Search vendor "Apache" for product "Http Server"
>= 2.4.0 <= 2.4.46
Search vendor "Apache" for product "Http Server" and version " >= 2.4.0 <= 2.4.46"
-
Affected
Debian
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Debian Linux
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9.0
Search vendor "Debian" for product "Debian Linux" and version "9.0"
-
Affected
Debian
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Debian Linux
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10.0
Search vendor "Debian" for product "Debian Linux" and version "10.0"
-
Affected
Fedoraproject
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Fedora
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34
Search vendor "Fedoraproject" for product "Fedora" and version "34"
-
Affected
Fedoraproject
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Fedora
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35
Search vendor "Fedoraproject" for product "Fedora" and version "35"
-
Affected
Oracle
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Enterprise Manager Ops Center
Search vendor "Oracle" for product "Enterprise Manager Ops Center"
12.4.0.0
Search vendor "Oracle" for product "Enterprise Manager Ops Center" and version "12.4.0.0"
-
Affected
Oracle
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Instantis Enterprisetrack
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17.1
Search vendor "Oracle" for product "Instantis Enterprisetrack" and version "17.1"
-
Affected
Oracle
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Instantis Enterprisetrack
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17.2
Search vendor "Oracle" for product "Instantis Enterprisetrack" and version "17.2"
-
Affected
Oracle
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Instantis Enterprisetrack
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17.3
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-
Affected
Oracle
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Secure Backup
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< 18.1.0.1.0
Search vendor "Oracle" for product "Secure Backup" and version " < 18.1.0.1.0"
-
Affected
Oracle
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Zfs Storage Appliance Kit
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8.8
Search vendor "Oracle" for product "Zfs Storage Appliance Kit" and version "8.8"
-
Affected
Netapp
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Cloud Backup
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--
Affected