CVE-2016-4437

Name: CVE-2016-4437
Creator: NVD / NIST
Published: 2016-06-07T14:06:13.247+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10Actively ExploitedEPSS 93.14%

Last modified Jun 17, 2026

CVE-2016-4437 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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 has confirmed active exploitation in the wild. EPSS estimates a 93.14% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

93.14%

99.8th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by May 3, 2022.

Weakness Enumeration

CWE-321

Affected Software

Vendor	Product	Versions
Apache	Aurora	>= 0.10.0, < 0.18.1
Apache	Shiro	< 1.2.5
Redhat	Fuse	1.0
Redhat	Jboss Middleware Text-Only Advisories	1.0

References

http://packetstormsecurity.com/files/137310/Apache-Shiro-1.2.4-Information-Disclosure.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/157497/Apache-Shiro-1.2.4-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
http://rhn.redhat.com/errata/RHSA-2016-2035.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-2036.htmlThird Party Advisory
http://www.securityfocus.com/archive/1/538570/100/0/threadedBroken Link, Third Party Advisory, VDB Entry
http://www.securityfocus.com/bid/91024Broken Link, Third Party Advisory, VDB Entry
https://lists.apache.org/thread.html/ef3a800c7d727a00e04b78e2f06c5cd8960f09ca28c9b69d94c3c4c4%40%3Cannouncements.aurora.apache.org%3EMailing List
http://packetstormsecurity.com/files/137310/Apache-Shiro-1.2.4-Information-Disclosure.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/157497/Apache-Shiro-1.2.4-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
http://rhn.redhat.com/errata/RHSA-2016-2035.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-2036.htmlThird Party Advisory
http://www.securityfocus.com/archive/1/538570/100/0/threadedBroken Link, Third Party Advisory, VDB Entry
http://www.securityfocus.com/bid/91024Broken Link, Third Party Advisory, VDB Entry
https://lists.apache.org/thread.html/ef3a800c7d727a00e04b78e2f06c5cd8960f09ca28c9b69d94c3c4c4%40%3Cannouncements.aurora.apache.org%3EMailing List
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-4437US Government Resource

Timeline

Published: Jun 7, 2016
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2016-4437?

How severe is CVE-2016-4437?

CVE-2016-4437 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 93.14% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2016-4437?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2016-4437?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST