CVE-2021-41303 | Apache Shiro before 1.8.0, when using Apache Shiro with Spring Boot, a specially crafted HTTP request may cause an authentication bypass

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.

Published: 2021-09-17 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-41303 is rated High Risk (79/100): CVSS Critical severity, with high exploitation likelihood (EPSS 75.57%, 99th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +26.28% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-41303

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 49.29% 75.57% +26.28%
2 2026-04-30 46.81% 49.29% +2.47%
3 2026-04-05 — 46.81% —

Full EPSS history (40 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-41303

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2021-41303

GitHub Security Advisory for CVE-2021-41303

GHSA-f6jp-j6w3-w9hm · Severity: critical · Ecosystem: maven — Apache Shiro vulnerable to a specially crafted HTTP request causing an authentication bypass

OS Trackers for CVE-2021-41303

vendor priority summary link
debian not yet assigned CVE-2021-41303 not yet assigned priority: Debian including 1 source packages (shiro), 4 status rows across 4 suites (bookworm, bullseye, sid, trixie): open 4. https://security-tracker.debian.org/tracker/CVE-2021-41303
redhat high — https://access.redhat.com/security/cve/CVE-2021-41303
ubuntu medium CVE-2021-41303 medium priority: Ubuntu including 1 source packages (shiro), 13 status rows across 13 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, trusty, upstream, xenial): not-affected 6, ignored 5, DNE 1, released 1. https://ubuntu.com/security/CVE-2021-41303

Affected software / configurations for CVE-2021-41303

Vendor Product Version Raw CPE
apache shiro < 1.8.0 cpe:2.3:a:apache:shiro:*:*:*:*:*:*:*:*
oracle financial_services_crime_and_compliance_management_studio 8.0.8.2.0 cpe:2.3:a:oracle:financial_services_crime_and_compliance_management_studio:8.0.8.2.0:*:*:*:*:*:*:*
oracle financial_services_crime_and_compliance_management_studio 8.0.8.3.0 cpe:2.3:a:oracle:financial_services_crime_and_compliance_management_studio:8.0.8.3.0:*:*:*:*:*:*:*

References for CVE-2021-41303

cvelogic Threat Intelligence