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CVE-2021-29440— Twig allowing dangerous PHP functions by default

Quick assessment

Affected
getgrav grav
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.

Grav是一套可扩展的用于个人博客、小型内容发布平台和单页产品展示的CMS（内容管理系统）。 Grav 存在代码注入漏洞，攻击者可利用该漏洞任意代码执行和提升实例上的特权。

CVSS 8.4 · High EPSS 29.90% · P98

Public Exploits 1

ExploitDB · 1 EDB-49961 [webapps]
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I. Basic Information for CVE-2021-29440

Vulnerability Information
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Vulnerability Title
Twig allowing dangerous PHP functions by default
Source: CVE Program / CVE List V5
Vulnerability Description
Grav is a file based Web-platform. Twig processing of static pages can be enabled in the front matter by any administrative user allowed to create or edit pages. As the Twig processor runs unsandboxed, this behavior can be used to gain arbitrary code execution and elevate privileges on the instance. The issue was addressed in version 1.7.11.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Grav 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grav是一套可扩展的用于个人博客、小型内容发布平台和单页产品展示的CMS（内容管理系统）。 Grav 存在代码注入漏洞，攻击者可利用该漏洞任意代码执行和提升实例上的特权。
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
getgrav grav < 1.7.11 -

II. Public POCs for CVE-2021-29440

# POC Description Source Link Shenlong Link
1 Unsafe Twig processing of static pages leading to RCE in Grav CMS 1.7.10 https://github.com/CsEnox/CVE-2021-29440 POC Details
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III. Intelligence Information for CVE-2021-29440

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Vendor Advisories for CVE-2021-29440 (1)

Exploits & Public PoCs for CVE-2021-29440 (1)

Security Blog Posts for CVE-2021-29440 (1)

Other References for CVE-2021-29440 (1)

IV. Related Vulnerabilities

Same product: grav
Same vendor: getgrav
Same weakness: CWE-94

V. Comments for CVE-2021-29440

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