What is CVE-2016-4437?

CVE-2016-4437 is a critical-severity vulnerability in Apache Aurora, classified under Use of Hard-coded Cryptographic Key. CVSS score: 9.8/10. Published 2016-06-07.

How severe is CVE-2016-4437?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2016-4437 known to be exploited?

Yes. CVE-2016-4437 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 80 public proof-of-concept repositories are indexed.

Vulnerability in Apache Aurora

CVE-2016-4437

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.

Published 2016-06-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.930 (99.8th percentile), scored 2026-10-15.

High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.930 · newest: 0.930 · change: 0.000

Affected products

Apache Aurora
Apache Shiro
Red Hat Fuse — versions 1.0
Red Hat Jboss Middleware Text-Only Advisories — versions 1.0

Weakness classification (CWE)

CWE-321 — Use of Hard-coded Cryptographic Key

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2021-11-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-05-03.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

rhn.redhat.com/errata/RHSA-2016-2035.html (vendor-advisory, Third Party Advisory)
lists.apache.org/thread.html/ef3a800c7d727a00e04b78e2f06c5cd8960f09ca28c9b69d94… (mailing-list, Mailing List)
packetstormsecurity.com/files/137310/Apache-Shiro-1.2.4-Information-Disclosure… (VDB Entry, Third Party Advisory)
rhn.redhat.com/errata/RHSA-2016-2036.html (vendor-advisory, Third Party Advisory)
www.securityfocus.com/bid/91024 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
www.securityfocus.com/archive/1/538570/100/0/threaded (mailing-list, VDB Entry, Third Party Advisory, Broken Link)
packetstormsecurity.com/files/157497/Apache-Shiro-1.2.4-Remote-Code-Execution.h… (Exploit, VDB Entry, Third Party Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2016-4437?: CVE-2016-4437 is a critical-severity vulnerability in Apache Aurora, classified under Use of Hard-coded Cryptographic Key. CVSS score: 9.8/10. Published 2016-06-07.
How severe is CVE-2016-4437?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2016-4437 known to be exploited?: Yes. CVE-2016-4437 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 80 public proof-of-concept repositories are indexed.