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CVE-2021-21702— Null Dereference in SoapClient

Quick assessment

Affected
PHP Group PHP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PHP（PHP：Hypertext Preprocessor，PHP：超文本预处理器）是PHP社区的共同维护的一种开源的通用计算机脚本语言。该语言主要用于Web开发，支持多种数据库及操作系统。 Php SoapClient 存在代码问题漏洞，攻击者可利用该漏洞强制一个空指针被解引用，从而触发拒绝服务。以下产品及型号受到影响：7.3.x 至 7.3.27, 7.4.x 至 7.4.15 and 8.0.x 至 8.0.2。

CVSS 5.3 · Medium EPSS 3.15% · P88

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-21702

Vulnerability Information
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Vulnerability Title
Null Dereference in SoapClient
Source: CVE Program / CVE List V5
Vulnerability Description
In PHP versions 7.3.x below 7.3.27, 7.4.x below 7.4.15 and 8.0.x below 8.0.2, when using SOAP extension to connect to a SOAP server, a malicious SOAP server could return malformed XML data as a response that would cause PHP to access a null pointer and thus cause a crash.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
PHP 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PHP（PHP：Hypertext Preprocessor，PHP：超文本预处理器）是PHP社区的共同维护的一种开源的通用计算机脚本语言。该语言主要用于Web开发，支持多种数据库及操作系统。 Php SoapClient 存在代码问题漏洞，攻击者可利用该漏洞强制一个空指针被解引用，从而触发拒绝服务。以下产品及型号受到影响：7.3.x 至 7.3.27, 7.4.x 至 7.4.15 and 8.0.x 至 8.0.2。
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)

Affected Products

Vendor Product Affected Versions CPE Subscribe
PHP Group PHP 7.3.x ~ 7.3.27 -

II. Public POCs for CVE-2021-21702

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III. Intelligence Information for CVE-2021-21702

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Vendor Advisories for CVE-2021-21702 (4)

Mailing List Discussions for CVE-2021-21702 (1)

Other References for CVE-2021-21702 (2)

IV. Related Vulnerabilities

Same product: PHP
Same vendor: PHP Group
Same weakness: CWE-476

V. Comments for CVE-2021-21702

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