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CVE-2021-3902— Improper Restriction of XML External Entity Reference in dompdf/dompdf

Quick assessment

Affected
dompdf dompdf/dompdf
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.

Dompdf是Dompdf开源的一个 HTML 到 PDF 的转换器。 Dompdf 2.0.0之前版本存在代码问题漏洞，该漏洞源于存在对外部实体(XXE)漏洞的不当限制，可能导致服务器端请求伪造(SSRF)和反序列化攻击。

AI Predicted 9.8 Difficulty: Easy EPSS 0.95% · P60
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I. Basic Information for CVE-2021-3902

Vulnerability Information
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Vulnerability Title
Improper Restriction of XML External Entity Reference in dompdf/dompdf
Source: CVE Program / CVE List V5
Vulnerability Description
An improper restriction of external entities (XXE) vulnerability in dompdf/dompdf's SVG parser allows for Server-Side Request Forgery (SSRF) and deserialization attacks. This issue affects all versions prior to 2.0.0. The vulnerability can be exploited even if the isRemoteEnabled option is set to false. It allows attackers to perform SSRF, disclose internal image files, and cause PHAR deserialization attacks.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
XML外部实体引用的不恰当限制(XXE)
Source: CVE Program / CVE List V5
Vulnerability Title
Dompdf 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Dompdf是Dompdf开源的一个 HTML 到 PDF 的转换器。 Dompdf 2.0.0之前版本存在代码问题漏洞，该漏洞源于存在对外部实体(XXE)漏洞的不当限制，可能导致服务器端请求伪造(SSRF)和反序列化攻击。
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
dompdf dompdf/dompdf unspecified ~ 2.0.0 -

II. Public POCs for CVE-2021-3902

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III. Intelligence Information for CVE-2021-3902

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Vendor Advisories for CVE-2021-3902 (1)

IV. Related Vulnerabilities

Same product: dompdf/dompdf
Same vendor: dompdf
Same weakness: CWE-611

V. Comments for CVE-2021-3902

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