CVE-2020-17523: Apache Shiro before 1.7.1, when using Apache Shiro with Spring, a specially crafted HTTP request may cause an authent…
- Is it exploited?
Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of .
VulnCheck KEV lists it since . VulnCheck's own honeypots also recorded exploitation attempts.
- How likely is exploitation in the next 30 days?
- 85.9%
EPSS score, percentile 99.7 of all scored records. A probability estimated by FIRST, not a report of exploitation.
- How severe?
- Not scored
The CVE record carries no CVSS score.
- What should I do?
CISA has set no required action, because the vulnerability is not in KEV.
No patch or vendor advisory is listed in the CVE record. Check Apache's advisories.
- Which versions are affected?
Affected
- before 1.7.1
Source: CISA KEV 2026.11.10, as of ; VulnCheck KEV, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.
Description
Apache Shiro before 1.7.1, when using Apache Shiro with Spring, a specially crafted HTTP request may cause an authentication bypass.
Source: CVE List, as of . About the data.
What to do
Advisories and patches
No patch, vendor advisory or mitigation is listed in the CVE record. Check Apache's own security advisories for a fix, and compare your version with the affected versions below.
This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.
Affected products and versions
Versions by product, as listed in the CVE record (1 product)
| Status | Versions |
|---|---|
| Affected | before 1.7.1 |
Source: CVE List, as of . About the data.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| CVE record last updated |
References
8
- lists.apache.org
- [activemq-gitbox] 20210210 [GitHub] [activemq] ehossack-aws opened a new pull request #614: Update shiro to 1.7.1
- [activemq-issues] 20210301 [jira] [Created] (AMQ-8159) High severity security issues found in Apache Shiro v.1.7.0
- [shiro-dev] 20210331 Re: Request for assistance to backport CVE-2020-13933 fix
- [shiro-dev] 20210407 Re: Request for assistance to backport CVE-2020-13933 fix
- [shiro-dev] 20210424 Re: Ask help for upgrading Shiro in CDH platform to 1.7.1
- [activemq-users] 20210427 Release date for ActiveMQ v5.16.2 to fix CVEs
- [shiro-dev] 20210504 Re: Request for assistance to backport CVE-2020-13933 fix
Known exploited Apache vulnerabilities
- CVE-2016-3081: Apache Struts Command Injection Vulnerability
- CVE-2026-34486: Apache Tomcat Missing Encryption of Sensitive Data Vulnerability
- CVE-2026-34197: Apache ActiveMQ Improper Input Validation Vulnerability
- CVE-2024-38475: Apache HTTP Server Improper Escaping of Output Vulnerability
- CVE-2025-24813: Apache Tomcat Path Equivalence Vulnerability