Vulnerability Monitor

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CVE-2020-25817

SilverStripe through 4.6.0-rc1 has an XXE Vulnerability in CSSContentParser. A developer utility meant for parsing HTML within unit tests can be vulnerable to XML External Entity (XXE) attacks. When this developer utility is misused for purposes involving external or user submitted data in custom project code, it can lead to vulnerabilities such as XSS on HTML output rendered through this custom code. This is now mitigated by disabling external entities during parsing. (The correct CVE ID year is 2020 [CVE-2020-25817, not CVE-2021-25817]).

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 4.8, indicating it can be exploited remotely over the network with relatively low complexity though user interaction is required . The vulnerability impacts limited data confidentiality, limited integrity, for affected systems. Impacting 1 product from silverstripe organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2021-06-08T18:15:07.907

Last Modified

2024-11-21T05:18:50.080

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 4.8 (MEDIUM)

CVSSv2 Vector

AV:N/AC:M/Au:S/C:N/I:P/A:N

Access Vector: NETWORK
Access Complexity: MEDIUM
Authentication: SINGLE
Confidentiality Impact: NONE
Integrity Impact: PARTIAL
Availability Impact: NONE

Exploitability Score

6.8

Impact Score

2.9

Weaknesses

Type: Primary
CWE-611

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	silverstripe	silverstripe	< 4.6.0	Yes
Application	silverstripe	silverstripe	4.6.0	Yes

References

https://forum.silverstripe.org/c/releases Release Notes, Vendor Advisory ([email protected])
https://www.silverstripe.org/blog/tag/release Release Notes, Vendor Advisory ([email protected])
https://www.silverstripe.org/download/security-releases/ Vendor Advisory ([email protected])
https://www.silverstripe.org/download/security-releases/cve-2020-25817 Broken Link ([email protected])
https://forum.silverstripe.org/c/releases Release Notes, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.silverstripe.org/blog/tag/release Release Notes, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.silverstripe.org/download/security-releases/ Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.silverstripe.org/download/security-releases/cve-2020-25817 Broken Link (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For silverstripe's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.