CVE-2020-27846

Exp

A signature verification vulnerability exists in crewjam/saml. This flaw allows an attacker to bypass SAML Authentication. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Published: 2020-12-21 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]

NVD Status：Modified，CVE State: published

View at NVD, CVE.org, EUVD

Threat Intelligence & Risk Assessment for CVE-2020-27846

EPSS CVSS CWE GHSA Exploit-DB Affected OS Tracker

Conclusion & alert: CVE-2020-27846 is rated High Exploit Risk (86.1/100): CVSS Critical severity, with high exploitation likelihood (EPSS 7.54%, 92th percentile). Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2020-27846

EDB-ID	Source	Kind	Published	Link
—	nvd_ref	exploit_tag		Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2020-27846

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-02-09	7.73%	7.54%	-0.19%
2	2026-01-08	11.09%	7.73%	-3.36%
3	2025-12-28	—	11.09%	—

Full EPSS history (29 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-27846

CVSS metrics for this CVE.

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
9.8	3.1	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	5.9	[email protected]
10.0	2.0	HIGH	`AV:N/AC:L/Au:N/C:C/I:C/A:C` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:C) Complete confidentiality impact. Integrity impact (I:C) Complete integrity impact. Availability impact (A:C) Complete availability impact.	10.0	10.0	[email protected]

Weakness enumeration for CVE-2020-27846

CWE-115 MITRE ↗

GitHub Security Advisory for CVE-2020-27846

GHSA-4hq8-gmxx-h6w9 · Severity: critical · Ecosystem: go — XML Processing error in github.com/crewjam/saml

OS Trackers for CVE-2020-27846

vendor	priority	summary	link
`alpine`	critical	CVE-2020-27846: 1 source package rows (grafana); 4 state rows across 2 repos (3.22-community, edge-community); fixed 0, open 4.	https://security.alpinelinux.org/vuln/CVE-2020-27846
`redhat`	critical	—	https://access.redhat.com/security/cve/CVE-2020-27846

Affected software / configurations for CVE-2020-27846

Vendor	Product	Version	Raw CPE
grafana	grafana	< 6.7.5	cpe:2.3:a:grafana:grafana:::::enterprise:::*
grafana	grafana	>= 7.0.0, < 7.2.3	cpe:2.3:a:grafana:grafana:::::enterprise:::*
grafana	grafana	>= 7.3.0, < 7.3.6	cpe:2.3:a:grafana:grafana:::::enterprise:::*
saml_project	saml	< 0.4.3	cpe:2.3:a:saml_project:saml::::::::
redhat	openshift_container_platform	3.11	cpe:2.3:a:redhat:openshift_container_platform:3.11:::::::*
redhat	openshift_container_platform	4.0	cpe:2.3:a:redhat:openshift_container_platform:4.0:::::::*
redhat	openshift_service_mesh	2.0	cpe:2.3:a:redhat:openshift_service_mesh:2.0:::::::*
redhat	enterprise_linux	8.0	cpe:2.3:o:redhat:enterprise_linux:8.0:::::::*
fedoraproject	fedora	32	cpe:2.3:o:fedoraproject:fedora:32:::::::*
fedoraproject	fedora	33	cpe:2.3:o:fedoraproject:fedora:33:::::::*

References for CVE-2020-27846

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1907670	Issue Tracking Patch Third Party Advisory
https://github.com/crewjam/saml/security/advisories/GHSA-4hq8-gmxx-h6w9	Third Party Advisory
https://grafana.com/blog/2020/12/17/grafana-6.7.5-7.2.3-and-7.3.6-released-with-important-security-fix-for-grafana-enterprise/	Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3YUTKIRWT6TWU7DS6GF3EOANVQBFQZYI/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ICP3YRY2VUCNCF2VFUSK77ZMRIC77FEM/
https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/	Exploit Third Party Advisory
https://security.netapp.com/advisory/ntap-20210205-0002/	Third Party Advisory

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