SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

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.

CRITICAL 9.8EPSS 76.1%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 76.1%, higher than 100% of all known CVEs. Patch or mitigate before the next change window.

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.

CVSS 3.1
9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
76.13% probability · 100th percentile
Public exploits
None in Exploit-DB
CISA KEV
Not listed
Weakness
CWE-287
Affected
apache/shiro · oracle/financial services crime and compliance management studio
Source
security@apache.org
EPSS trend
0%40%80%26 October 2026: 76.13%26 October 202626 October 2026

EPSS 76.1% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.