HOMEVULNERABILITIESCVE-2020-27846
CRITICAL

CVE-2020-27846

CWE-115Published: December 21, 2020· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2020-27846 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Fedora1 product(s)
fedora
grafana1 product(s)
grafana
Red Hat3 product(s)
openshift container platformopenshift service meshenterprise linux
saml_project1 product(s)
saml
Source: NVD CPE · 8 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=1907670
PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=1907670
ADVISORYhttps://github.com/crewjam/saml/security/advisories/GHSA-4hq8-gmxx-h6w9
ADVISORYhttps://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/
ADVISORYhttps://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/
ADVISORYhttps://security.netapp.com/advisory/ntap-20210205-0002/
ADVISORYhttps://github.com/crewjam/saml/security/advisories/GHSA-4hq8-gmxx-h6w9
ADVISORYhttps://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/
ADVISORYhttps://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/
ADVISORYhttps://security.netapp.com/advisory/ntap-20210205-0002/

All References (14)

→
https://bugzilla.redhat.com/show_bug.cgi?id=1907670Issue Tracking · Patch · Third Party Advisory
→
https://github.com/crewjam/saml/security/advisories/GHSA-4hq8-gmxx-h6w9Third 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
→
https://bugzilla.redhat.com/show_bug.cgi?id=1907670Issue Tracking · Patch · Third Party Advisory
→
https://github.com/crewjam/saml/security/advisories/GHSA-4hq8-gmxx-h6w9Third 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

Quick Facts

CVE IDCVE-2020-27846
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-115
CISA KEVNo
Affected4 vendor(s)
PublishedDec 21, 2020

Related CVEs (CWE-115)

CVE-2021-1587
8.6
CVE-2025-5747
8.0
CVE-2018-12116
7.5
CVE-2024-11169
7.5
CVE-2025-32908
7.5
CVE-2021-0207
7.5

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-27846 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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