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CVE-2021-26690— mod_session NULL pointer dereference

Quick assessment

Affected
Apache Software Foundation Apache HTTP Server
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache HTTP Server是美国阿帕奇（Apache）基金会的一款开源网页服务器。该服务器具有快速、可靠且可通过简单的API进行扩充的特点。 Apache HTTP Server 存在代码问题漏洞，该漏洞源于在mod会话中一个NULL指针解引用错误。远程攻击者可利用该漏洞将专门设计的数据传递给应用程序，并执行拒绝服务(DoS)攻击。以下产品及版本受到影响：EasyApache: 4 2017-5-16, 4 2017-6-13, 4 2017-6-21, 4 2017-7-11, 4 2017-

AI Predicted 7.5 Difficulty: Easy EPSS 65.31% · P99

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-26690

Vulnerability Information
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Vulnerability Title
mod_session NULL pointer dereference
Source: CVE Program / CVE List V5
Vulnerability Description
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
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Apache HTTP Server 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache HTTP Server是美国阿帕奇（Apache）基金会的一款开源网页服务器。该服务器具有快速、可靠且可通过简单的API进行扩充的特点。 Apache HTTP Server 存在代码问题漏洞，该漏洞源于在mod会话中一个NULL指针解引用错误。远程攻击者可利用该漏洞将专门设计的数据传递给应用程序，并执行拒绝服务(DoS)攻击。以下产品及版本受到影响：EasyApache: 4 2017-5-16, 4 2017-6-13, 4 2017-6-21, 4 2017-7-11, 4 2017-
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Shenlong Deep Dive — AI Deep Analysis

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache HTTP Server 2.4.46 -

II. Public POCs for CVE-2021-26690

# POC Description Source Link Shenlong Link
1 None https://github.com/dja2TaqkGEEfA45/CVE-2021-26690 POC Details
2 CVE-2021-26690 patch diffing - Apache HTTP mod_session NULL pointer dereference https://github.com/7own/CVE-2021-26690---Apache-mod_session POC Details
3 CVE-2021-26690 - Null Pointer Dereference leads to Denial of Service attack on Apache HTTP Server versions 2.4.0 to 2.4.46 https://github.com/0xdeviner/CVE-2021-26690 POC Details
4 None https://github.com/danielduan2002/CVE-2021-26690 POC Details
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III. Intelligence Information for CVE-2021-26690

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Vendor Advisories for CVE-2021-26690 (5)

Mailing List Discussions for CVE-2021-26690 (7)

Same Patch Batch · Apache Software Foundation · 2021-06-10 · 7 CVEs total

CVE-2021-30641 Unexpected URL matching with 'MergeSlashes OFF'
CVE-2021-26691 Apache HTTP Server mod_session response handling heap overflow
CVE-2020-13950 mod_proxy_http NULL pointer dereference
CVE-2020-35452 mod_auth_digest possible stack overflow by one nul byte
CVE-2020-13938 Improper Handling of Insufficient Privileges
CVE-2019-17567 mod_proxy_wstunnel tunneling of non Upgraded connections

IV. Related Vulnerabilities

Same product: Apache HTTP Server
Same vendor: Apache Software Foundation

V. Comments for CVE-2021-26690

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