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CVE-2016-4437

99
FAUCET Score

CVE-2016-4437 is a critical remote code execution vulnerability in Apache Shiro versions prior to 1.2.5, impacting products like Apache Aurora and Fuse. This flaw allows unauthenticated attackers to execute arbitrary code or bypass access controls by manipulating an unspecified request parameter when the "remember me" feature lacks a configured cipher key. With a CVSS score of 9.8 and an EPSS score indicating high exploitability, this vulnerability is actively exploited in the wild, with public Metasploit modules and Nuclei templates available, and has garnered significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.10.0, < 0.18.1CPE matchmatch criteria
cpe:2.3:a:apache:aurora:*:*:*:*:*:*:*:*
< 1.2.5CPE matchmatch criteria
cpe:2.3:a:apache:shiro:*:*:*:*:*:*:*:*
1.0CPE matchmatch criteria
cpe:2.3:a:redhat:fuse:1.0:*:*:*:*:*:*:*
1.0CPE matchmatch criteria
cpe:2.3:a:redhat:jboss_middleware_text-only_advisories:1.0:*:*:*:*:middleware:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
93.04%
Probability of exploitation in next 30 days
EPSS Percentile
99.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
Added to KEV · Nov 3, 2021
Metasploit: Apache Shiro v1.2.4 Cookie RememberME Deserial RCE · Jun 7, 2016
Nuclei: CVE-2016-4437 · May 11, 2023
ExploitDB: EDB-48410 · May 1, 2020
This CVE's current EPSS score of 0.9304 is in the 99th percentile among its peer group of 36,821 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

mavenpatch availablevia ghsa
Product: org.apache.shiro:shiro-coreFixed in: 1.2.5
redhatpatch availablevia redhat_api
Product: Red Hat JBoss A-MQ 6.3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat JBoss Fuse 6.3
View patch
redhatno patchvia redhat_api
Product: Red Hat JBoss A-MQ 6Fixed in: shiro-core
redhatno patchvia redhat_api
Product: Red Hat JBoss Fuse 6Fixed in: shiro-core
redhatno patchvia redhat_api
Product: Red Hat JBoss Fuse Service Works 6Fixed in: shiro-core
redhatno patchvia redhat_api
Product: Red Hat OpenShift Enterprise 2Fixed in: shiro-core

Vendor Advisories (2)

mavenGHSA-p836-389h-j692critical

Improper Access Control in Apache Shiro

May 14, 2022
redhatCVE-2016-4437Important

shiro: Security constraint bypass

Jun 3, 2016

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
packetstormsecurity.com / files/137310/Apache-Shiro-1.2.4-Information-Disclosure.html
Third Party AdvisoryVDB Entry
packetstormsecurity.com / files/157497/Apache-Shiro-1.2.4-Remote-Code-Execution.html
ExploitThird Party AdvisoryVDB Entry
rhn.redhat.com / errata/RHSA-2016-2035.html
Third Party Advisory
rhn.redhat.com / errata/RHSA-2016-2036.html
Third Party Advisory
lists.apache.org / thread.html/ef3a800c7d727a00e04b78e2f06c5cd8960f09ca28c9b69d94c3c4c4%40%3Cannouncements.aurora.apache.org%3E
Mailing List
securityfocus.com / archive/1/538570/100/0/threaded
Broken LinkThird Party AdvisoryVDB Entry
securityfocus.com / bid/91024
Broken LinkThird Party AdvisoryVDB Entry