Vulnerability Monitor

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CVE-2020-27847

A vulnerability exists in the SAML connector of the github.com/dexidp/dex library used to process SAML Signature Validation. This flaw allows an attacker to bypass SAML authentication. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability. This flaw affects dex versions before 2.27.0.

Security Impact Summary

This vulnerability carries a CRITICAL severity rating with a CVSS v3.1 score of 9.8, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 1 product from linuxfoundation 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

2021-05-28T11:15:07.703

Last Modified

2024-11-21T05:21:55.627

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 9.8 (CRITICAL)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

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

Exploitability Score

10.0

Impact Score

6.4

Weaknesses

Type: Secondary
CWE-228

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	linuxfoundation	dex	< 2.27.0	Yes

References

https://bugzilla.redhat.com/show_bug.cgi?id=1907732 Issue Tracking, Third Party Advisory ([email protected])
https://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5 Patch, Third Party Advisory ([email protected])
https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/ Vendor Advisory ([email protected])
https://bugzilla.redhat.com/show_bug.cgi?id=1907732 Issue Tracking, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/ Vendor Advisory (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 linuxfoundation'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.