CVE-2021-37843

CRITICAL

9.8

CVSS Score

Published: August 2, 2021 at 06:47 PM UTC

Updated: June 17, 2026 at 04:01 AM UTC

1 product affected across 1 vendorSaml Single Sign on

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Severity

CRITICAL9.8

Exploit prediction

EPSS 2%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Saml Single Sign on · Atlassianatlassian-app

95%

v < 2.5.9v < 3.5.6v < 3.6.6.13.0.0 ≤ v < 3.6.63.6.0 ≤ v < 3.6.6.14.0.0 ≤ v < 4.0.125.0.0 ≤ v < 5.0.5

Affected range stops below 2.5.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.5.6, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.6.6, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.6.6.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.0.12, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.0.5, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_MISCThird Party Advisory

Source: [email protected]

https://wiki.resolution.de/doc/saml-sso/5.0.x/all/security-advisories/2021-07-29-authentication-bypass-network-attacker-can-login-to-users-accounts-when-usernames-are-known

CVSS

9.8CRITICALmitre

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-306

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