Which products and versions are affected by CVE-2021-41303?

Affected: Shiro (Apache) versions >= Apache Shiro; Financial Services Crime And Compliance Management Studio (Oracle) versions 8.0.8.2.0, 8.0.8.3.0; org.apache.shiro:shiro-core (maven). The full list is in the CVE brief.

Is CVE-2021-41303 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2021-41303 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2021-41303?

No public exploit code is known.

Is there a fix for CVE-2021-41303?

Fixed versions are available, including Shiro 1.8.0, org.apache.shiro:shiro-core 1.8.0.

How urgently should CVE-2021-41303 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2021-41303

Critical

Apache Shiro vulnerable to a specially crafted HTTP request causing an authentication bypass

Published Sep 20, 2021 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2021-41303, GHSA-f6jp-j6w3-w9hm

Key Facts

Patch immediately

CVE-2021-41303 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Shiro (Apache), Financial Services Crime And Compliance Management Studio (Oracle), org.apache.shiro:shiro-core (maven).
It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
EPSS estimates a 76% probability of exploitation in the next 30 days.
Fixed versions are available, including Shiro 1.8.0, org.apache.shiro:shiro-core 1.8.0.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v3.1

9.8

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

EPSS (30-day exploit likelihood)

76%

Higher than 99.5% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

None known

Get the full CVE-2021-41303 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Apache Shiro before 1.8.0, when using Apache Shiro with Spring Boot, a specially crafted HTTP request may cause an authentication bypass. Users should update to Apache Shiro 1.8.0.

Affected Products

15 affected entries in total

Product	Affected versions	Fixed in
ShiroApache	>= Apache Shiro	1.8.0
Financial Services Crime And Compliance Management StudioOracle	8.0.8.2.0, 8.0.8.3.0	n/a
org.apache.shiro:shiro-coremaven	See advisory	1.8.0

Patched Releases

Shiro

1.8.0

org.apache.shiro:shiro-core

1.8.0

Timeline

Publicly disclosed
Sep 20, 2021
Last updated
Aug 4, 2026

Weakness Type

CWE-287 Improper Authentication

References

4 more references in the full CVE brief

FAQ

Common Questions.

Apache Shiro before 1.8.0, when using Apache Shiro with Spring Boot, a specially crafted HTTP request may cause an authentication bypass.
Affected: Shiro (Apache) versions >= Apache Shiro; Financial Services Crime And Compliance Management Studio (Oracle) versions 8.0.8.2.0, 8.0.8.3.0; org.apache.shiro:shiro-core (maven). The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Shiro 1.8.0, org.apache.shiro:shiro-core 1.8.0.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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