CVE-2021-27736

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

1.28% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 68.0% of scored records. A rank, not a probability.

NVD base score

6.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-04-22 13:14Z5 YR AGO

Last updated

2024-08-03 21:26Z2 YR AGO

Reserved

2021-02-25

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-611Improper Restriction of XML External Entity ReferenceBase

Data version

5.1

Document digest

6b99fcb3bee13c5e482d1b36a2a68ef60f3d47151b6fc1381c047918c57a379f

• github.comhttps://github.com/FusionAuth/fusionauth-samlv2/compare/0.5.3...0.5.4x_refsource_MISC
• github.comhttps://github.com/FusionAuth/fusionauth-samlv2/commit/c66fb689d50010662f705d5b585c6388ce555dbdx_refsource_MISC
• www.compass-security.comhttps://www.compass-security.com/fileadmin/Research/Advisories/2021-03_CSNC-2021-004_FusionAuth_SAML_Library_XML_External_Entity.txtx_refsource_MISC