What is CVE-2021-37843?

CVE-2021-37843 is a critical-severity vulnerability in Atlassian Saml Single Sign On, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2021-08-02.

How severe is CVE-2021-37843?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Atlassian Saml Single Sign On

CVE-2021-37843

The resolution SAML SSO apps for Atlassian products allow a remote attacker to login to a user account when only the username is known (i.e., no other authentication is provided). The fixed versions are for Jira: 3.6.6.1, 4.0.12, 5.0.5; for Confluence 3.6.6, 4.0.12, 5.0.5; for Bitbucket 2.5.9, 3.6.6, 4.0.12, 5.0.5; for Bamboo 2.5.9, 3.6.6, 4.0.12, 5.0.5; and for Fisheye 2.5.9.

Vulnerability class: Broken Authentication

EPSS: 0.015 (72.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Atlassian Saml_single_sign_on
N/a — versions n/a

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

cve@mitre.org (Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-37843?: CVE-2021-37843 is a critical-severity vulnerability in Atlassian Saml Single Sign On, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2021-08-02.
How severe is CVE-2021-37843?: Critical severity. CVSS v3 base score is 9.8 out of 10.