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CVE-2025-1220— Null byte termination in hostnames

Quick assessment

Affected
PHP Group PHP
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.

PHP是PHP的一种在服务器端执行的脚本语言。 PHP 8.1.33之前版本、8.2.29之前版本、8.3.23之前版本和8.4.10之前版本存在安全漏洞，该漏洞源于fsockopen等函数未验证主机名是否包含空字符，可能导致安全问题。

CVSS 3.7 · Low EPSS 0.60% · P47

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-1220

Vulnerability Information
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Vulnerability Title
Null byte termination in hostnames
Source: CVE Program / CVE List V5
Vulnerability Description
In PHP versions:8.1.* before 8.1.33, 8.2.* before 8.2.29, 8.3.* before 8.3.23, 8.4.* before 8.4.10 some functions like fsockopen() lack validation that the hostname supplied does not contain null characters. This may lead to other functions like parse_url() treat the hostname in different way, thus opening way to security problems if the user code implements access checks before access using such functions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
PHP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PHP是PHP的一种在服务器端执行的脚本语言。 PHP 8.1.33之前版本、8.2.29之前版本、8.3.23之前版本和8.4.10之前版本存在安全漏洞，该漏洞源于fsockopen等函数未验证主机名是否包含空字符，可能导致安全问题。
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 8.1.* ~ 8.1.33 -

II. Public POCs for CVE-2025-1220

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
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claude_code · 12710 chars
GitHub 复现环境（可 clone 直接跑）
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POC zip download
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III. Intelligence Information for CVE-2025-1220

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Vendor Advisories for CVE-2025-1220 (1)

Same Patch Batch · PHP Group · 2025-07-13 · 3 CVEs total

CVE-2025-1735 5.9 MEDIUM pgsql extension does not check for errors during escaping
CVE-2025-6491 5.9 MEDIUM NULL Pointer Dereference in PHP SOAP Extension via Large XML Namespace Prefix

IV. Related Vulnerabilities

Same product: PHP
Same vendor: PHP Group
Same weakness: CWE-918

V. Comments for CVE-2025-1220

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