// For flags

CVE-2021-26690

mod_session NULL pointer dereference

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Cookie header handled by mod_session can cause a NULL pointer dereference and crash, leading to a possible Denial Of Service

Apache HTTP Server versiones 2.4.0 a 2.4.46, un encabezado de Cookie especialmente diseñado y gestionado por la función mod_session puede causar una desviación del puntero NULL y un fallo, lo que puede causar una denegación de servicio

A NULL pointer dereference was found in Apache httpd mod_session. The highest threat from this vulnerability is to system availability.

*Credits: This issue was discovered and reported by GHSL team member @antonio-morales (Antonio Morales)
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
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
  • 2024-09-11 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-476: NULL Pointer Dereference
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Apache
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Http Server
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>= 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
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-
Affected
Debian
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Debian Linux
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10.0
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-
Affected
Fedoraproject
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Fedora
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34
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-
Affected
Fedoraproject
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Fedora
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35
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-
Affected
Oracle
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Enterprise Manager Ops Center
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12.4.0.0
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-
Affected
Oracle
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Instantis Enterprisetrack
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17.1
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-
Affected
Oracle
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Instantis Enterprisetrack
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17.2
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-
Affected
Oracle
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Instantis Enterprisetrack
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17.3
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-
Affected
Oracle
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Zfs Storage Appliance Kit
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8.8
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-
Affected