CVE-2020-17523 Public exploit EPSS 85.9%
Apache Shiro before 1.7.1, when using Apache Shiro with Spring, a specially crafted HTTP request may cause an authentication bypass.
Summary
The flaw is in Apache Shiro versions before 1.7.1 when it is used together with Spring, where request handling can be subverted. An attacker who sends a specially crafted HTTP request can bypass authentication.
Heading is the official description · CVE.org
Priority scorePatchfirst’s 0 to 100 ranking. It adds points for CISA KEV listing, ransomware use, EPSS, threat reports, public exploit code and CVSS. Every CVE page shows the breakdown. Breakdown
24.9 / 100
- Exploited
- Not confirmed
- Reports
- 0
- Tactics
- 0/15
Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
Public exploit code (PoC-in-GitHub) was available the same day.
Patch historyEarlier and later CVEs in the same code, in date order. It shows when a fix was bypassed or incomplete and which version finally fixed it.
3 fixes in shiro-spring over 5 years. The latest fix listed for shiro-spring is 2.1.0.
Fixes in shiro-springMaven package, by fixed version. Earlier and later fixes in the same package, not necessarily the same bug.
- 1.7.0CVE-2020-175105 Nov 2020
- 1.7.1CVE-2020-175233 Feb 2021
- 2.1.0CVE-2026-239039 Feb 2026Latest listed
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
No techniques linkedNo ATT&CK techniques are linked to this CVE yet. MITRE CTID has not mapped it, and no report passage in the corpus ties it to a technique.
Am I affected? What do I upgrade to?
From GitHub Security Advisories and OSV3 packages in 1 ecosystem. No single main package: each of these ships the affected code.
- Mavenorg.apache.shiro:shiro-webAffected: All versions before 1.7.1Upgrade to 1.12.0 or later
- Mavenorg.apache.shiro:shiro-springAffected: All versions before 1.7.1Upgrade to 1.7.1 or later
- Mavenorg.apache.shiro:shiro-spring-boot-starterAffected: All versions before 1.7.1Upgrade to 1.7.1 or later