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Fencer Vulns
critical 9.8

CVE-2016-4437 kev in the critical feed json

Improper Access Control in Apache Shiro

published 2016-06-07 10 y ago modified 2026-06-17 4 mo ago also GHSA-p836-389h-j692 , EUVD-2022-4711

cvss
9.8
version 3.1, CNA
cisa kev
Exploited
added 2021-11-03
epss
93.0%
EPSS 93.0% chance of exploitation in 30 days, percentile 99.8%
public exploits
2
Metasploit, Exploit-DB, plus a Nuclei check

Summary

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.

Patch / fix

cisa required action Apply updates per vendor instructions.

  • maven org.apache.shiro:shiro-core 1.2.5
  • apache aurora 0.18.1
  • apache shiro 1.2.5
  • shiro Debian 14, Debian 13, Debian 12 1.2.5-1

debian advisories DEBIAN-CVE-2016-4437

  • shiro Ubuntu Pro 16.04 LTS 1.2.4-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2016-4437

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-4437 updated cvss 7.3

shiro: Security constraint bypass

  • Red Hat JBoss A-MQ 6 shiro-core shiro-core Red Hat JBoss Fuse 6 shiro-core shiro-core Red Hat JBoss Fuse Service Works 6 shiro-core shiro-core Red Hat OpenShift Enterprise 2 shiro-core shiro-core
    affected: no fix available
  • Red Hat JBoss A-MQ 6.3
    fixed: vendor fix RHSA-2016:2036
  • Red Hat JBoss Fuse 6.3
    fixed: vendor fix RHSA-2016:2035

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (Metasploit exploit/multi/http/shiro_rememberme_v124_deserialize)
  2. Published
  3. Added to CISA KEV
  4. CISA patch deadline
  5. CISA SSVC: exploitation active

Known exploited

Added
5 y ago
Patch by
2022-05-03 (4 y ago)
Ransomware
Not known
Required action
Apply updates per vendor instructions.
Vendor, product
Apache, Shiro
CISA name
Apache Shiro Code Execution Vulnerability

ATT&CK techniques

How it is exploited and what it leads to, in MITRE ATT&CK terms.

  • T1190 Exploit Public-Facing Application exploitation
  • T1059 Command and Scripting Interpreter primary impact

kev release 2025-07-28, att&ck v16.1. KEV to ATT&CK mappings by the MITRE Center for Threat-Informed Defense (Mappings Explorer, Apache-2.0). © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. Terms of use

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
yes
Technical impact
total
Assessed
21 mo ago

Exploit prediction

93.04% chance of exploitation in the next 30 days, higher than 99.8% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P
GitHub 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H

Affected packages

ecosystem package affected fixed in
maven org.apache.shiro:shiro-core
<1.2.5
1.2.5

Classification

Weakness
  • CWE-321 Use of Hard-coded Cryptographic Key
  • CWE-284 Improper Access Control

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.