# CVE-2016-4437: Apache Shiro Code Execution Vulnerability

> CVE-2016-4437: Apache Shiro Code Execution Vulnerability. CVSS 9.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2016-4437
Last updated: 2025-10-21T23:55:51Z

- Published: 2016-06-07 14:00 UTC · Updated: 2025-10-21 23:55 UTC · Assigner: redhat
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 93.0%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2022-05-03, ransomware use: Unknown

## Description

Apache Shiro before 1.2.5, when a cipher key has not been configured for the "remember me" feature, allows remote attackers to execute arbitrary code or bypass intended access restrictions via an unspecified request parameter.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Apache: Shiro

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2016-4437)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2016-4437)
- [http://packetstormsecurity.com/files/137310/Apache-Shiro-1.2.4-Information-Disclosure.html](http://packetstormsecurity.com/files/137310/Apache-Shiro-1.2.4-Information-Disclosure.html)
- [http://packetstormsecurity.com/files/157497/Apache-Shiro-1.2.4-Remote-Code-Execution.html](http://packetstormsecurity.com/files/157497/Apache-Shiro-1.2.4-Remote-Code-Execution.html)
- [http://rhn.redhat.com/errata/RHSA-2016-2035.html](http://rhn.redhat.com/errata/RHSA-2016-2035.html)
- [http://rhn.redhat.com/errata/RHSA-2016-2036.html](http://rhn.redhat.com/errata/RHSA-2016-2036.html)
- [https://lists.apache.org/thread.html/ef3a800c7d727a00e04b78e2f06c5cd8960f09ca28c9b69d94c3c4c4%40%3Cannouncements.aurora.apache.org%3E](https://lists.apache.org/thread.html/ef3a800c7d727a00e04b78e2f06c5cd8960f09ca28c9b69d94c3c4c4%2540%3Cannouncements.aurora.apache.org%3E)
- [http://www.securityfocus.com/archive/1/538570/100/0/threaded](http://www.securityfocus.com/archive/1/538570/100/0/threaded)
- [http://www.securityfocus.com/bid/91024](http://www.securityfocus.com/bid/91024)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2016-4437 · Markdown: https://rewindex.com/cve/CVE-2016-4437.md · JSON: https://rewindex.com/api/v1/cves/CVE-2016-4437 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:44:15.034Z