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CVE-2016-4437

Improper Access Control in Apache Shiro

9.8 CriticalIn KEVPublic exploitFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

93.0%Down 1.5 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 9.8

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.

Record
CVE-2016-4437
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness
CWE-321
Updated
2026-11-02
CVE List 9.8

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.

Record
CVE-2016-4437
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-321
Updated
2026-11-02
EUVDEUVD-2022-4711 9.8

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.

Record
EUVD-2022-4711
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-p836-389h-j692 9.8

Improper Access Control in Apache Shiro

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.

Record
GHSA-p836-389h-j692
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H
Weakness
CWE-284, CWE-321
Updated
2026-11-02
CISA KEV No score

Apache Shiro Code Execution Vulnerability

Apache Shiro contains a vulnerability which may allow remote attackers to execute code or bypass intended access restrictions via an unspecified request parameter when a cipher key has not been configured for the "remember me" feature.

Record
CVE-2016-4437
Weakness
CWE-284
Updated
2026-11-02
OSV 9.8

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.

Record
CVE-2016-4437
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-03
Show 4 moreShow less
OSVDEBIAN-CVE-2016-4437 9.8

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.

Record
DEBIAN-CVE-2016-4437
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVGHSA-p836-389h-j692 9.8

Improper Access Control in Apache Shiro

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.

Record
GHSA-p836-389h-j692
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H
Weakness
CWE-284, CWE-321
Updated
2026-11-02
OSVUBUNTU-CVE-2016-4437 9.8

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.

Record
UBUNTU-CVE-2016-4437
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUSN-7139-1 No score

shiro vulnerability

It was discovered that Apache Shiro used a static cipher within the "Remember Me" feature inside authentication by default. An attacker could possibly use this issue to achieve remote code execution or obtain sensitive information.

Record
USN-7139-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
org.apache.shiro:shiro-core
Maven
 through 1.2.4
1.2.5
shiro
Debian:12
 before 1.2.5-1
1.2.5-1
shiro
Debian:13
 before 1.2.5-1
1.2.5-1
shiro
Debian:14
 before 1.2.5-1
1.2.5-1
org.apache.shiro:shiro-core
Maven
 before 1.2.5, plus listed versions
1.0.0-incubating1.1.01.2.01.2.11.2.21.2.31.2.4
1.2.5
shiro
Ubuntu:Pro:16.04:LTS
 before 1.2.4-1ubuntu0.1~esm1, plus listed versions
1.2.4-1
1.2.4-1ubuntu0.1~esm1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
MetasploitApache Shiro v1.2.4 Cookie RememberME Deserial RCE2016-06-07
Exploit-DBApache Shiro 1.2.4 - Cookie RememberME Deserial RCE (Metasploit)2020-05-01
PoC in GitHubbkfish/Awesome_shiro2020-05-27
PoC in GitHubm3terpreter/CVE-2016-44372021-06-22
PoC in GitHub4nth0ny1130/shisoserial2021-12-23
PoC in GitHubpizza-power/CVE-2016-44372023-12-22
PoC in GitHubxk-mt/CVE-2016-44372024-01-15
PoC in GitHub35789-gh/cve-2016-44372026-02-19
PoC in GitHubCyberCTF/vulhub-shiro-cve-2016-44372026-10-08
NucleiApache Shiro 1.2.4 Cookie RememberME - Deserial Remote Code Execution Vulnerability

History

History
RecordedChangedSources
exploitation, exploitsOSV
first indexedCVE List, EUVD, Exploit-DB, GitHub Advisories, CISA KEV, Metasploit, Nuclei, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2016-4437 is a critical vulnerability (CVSS 9.8) in Apache Shiro, published June 7, 2016. CISA lists it as known to be exploited, since November 3, 2021. EUVD reports exploitation since November 3, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 93.0%, the 99th percentile. Fixed in org.apache.shiro:shiro-core 1.2.5.

References

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