Is CVE-2016-4437 in the CISA KEV catalog?

Yes. CVE-2016-4437 is on the CISA Known Exploited Vulnerabilities list, added 2021-11-03.

What is the CVSS severity of CVE-2016-4437?

CVE-2016-4437 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2016-4437?

CVE-2016-4437 has an EPSS score of 93.04% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-4437?

Upgrade shiro on debian 11 to 1.2.5-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2016-4437

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

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.

CWE-321

How to fix

Remediation Available

shiroDebian

Fixed in:1.2.5-1CVE-2016-4437

libshiro-javaUbuntu

Fixed in:1.2.4-1ubuntu0.1~esm1USN-7139-1

shiroUbuntu

Fixed in:1.2.4-1ubuntu0.1~esm1USN-7139-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

93.04%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

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.

Apply updates per vendor instructions.

Remediation due: 2022-05-03

References

Exploit1

packetstormsecurity.com

Third-Party Advisory5

Government Resource1

cisa.gov

Mailing List1

lists.apache.org

Related Vulnerabilities

Other CWE-321 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-30406	Critical	9.0	94%	KEV	Fix
CVE-2023-32169	Critical	9.8	56%	-	-
CVE-2023-27584	Critical	9.8	34%	-	Fix
CVE-2020-10884	High	8.8	25%	-	-
CVE-2021-4228	Medium	5.8	9.9%	-	-
CVE-2019-10963	Medium	4.3	6.8%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-22.