What is the CVSS score of CVE-2019-16891?

CVE-2019-16891 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 45.7%.

Is there a public PoC exploit available for CVE-2019-16891?

Yes, a public proof-of-concept exploit is available for CVE-2019-16891. Prioritise patching immediately. EPSS: 45.7%.

Is there a patch available for CVE-2019-16891?

Yes, a patch is available for CVE-2019-16891. Update the affected software to the latest version immediately.

Liferay Portal CVE-2019-16891

CRITICAL

Deserialization of Untrusted Data (CWE-502)

2019-10-04 cve@mitre.org

Deserialization Liferay Portal Liferay

9.8

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-502 OWASP Top 10:2025 A08:2025 - Software or Data Integrity Failures ASVS 5.0 V1 - Encoding and Sanitization Safe deserialization, type allowlists MITRE ATT&CK 2 techniques across 2 tactics: Execution, Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available.
Exploit ScenarioDerived	A remote attacker could execute arbitrary code through malicious serialized objects by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

Act Now Prioritize within 24-48h. Why: CRITICAL severity + public POC available.

Patch available 45.7% exploitation probability (EPSS)

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AnalysisAI

Liferay Portal CE 6.2.5 allows remote command execution because of deserialization of a JSON payload. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Avoid deserializing untrusted data. Use safe serialization formats (JSON). Implement integrity checks and type allowlists.

Affected Packages

maven com.liferay.portal:release.portal.bom fix: 7.1.1

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in maven

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Deserialization of Untrusted Data (CWE-502), which allows attackers to execute arbitrary code through malicious serialized objects. Liferay Portal CE 6.2.5 allows remote command execution because of deserialization of a JSON payload. Affected products include: Liferay Liferay Portal.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionNVD

Liferay Portal CE 6.2.5 allows remote command execution because of deserialization of a JSON payload.

Threat Intelligence Overview

EPSS Score

45.7%

Top 1% exploitable

Exploit

POC

Public exploit code exists

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC Yes

EPSS 45.7%

Patch available Yes

Active threat Yes

Deciding rule

CRITICAL severity + public POC available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

115

Low Medium High Critical

KEV: 0

EPSS: +46

CVSS: +49

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Insecure Deserialization CRITICAL

Insecure deserialization occurs when an application converts serialized data (a stream of bytes representing an object's state) back into a living object without proper validation.

Affected Products (CPE)NVD

cpe:2.3:a:liferay:liferay_portal:*:*:*:*:community:*:*:*

cpe:2.3:a:liferay:liferay_portal:6.1.0:b1:*:*:community:*:*:*

cpe:2.3:a:liferay:liferay_portal:6.1.0:b2:*:*:community:*:*:*

cpe:2.3:a:liferay:liferay_portal:6.1.0:b3:*:*:community:*:*:*

cpe:2.3:a:liferay:liferay_portal:6.1.0:b4:*:*:community:*:*:*

cpe:2.3:a:liferay:liferay_portal:6.1.0:ga1:*:*:community:*:*:*

cpe:2.3:a:liferay:liferay_portal:6.1.0:rc1:*:*:community:*:*:*

cpe:2.3:a:liferay:liferay_portal:6.1.1:ga2:*:*:community:*:*:*

cpe:2.3:a:liferay:liferay_portal:6.1.2:ga3:*:*:community:*:*:*

cpe:2.3:a:liferay:liferay_portal:6.2.0:b1:*:*:community:*:*:*

cpe:2.3:a:liferay:liferay_portal:6.2.0:b2:*:*:community:*:*:*

cpe:2.3:a:liferay:liferay_portal:6.2.0:ga1:*:*:community:*:*:*

cpe:2.3:a:liferay:liferay_portal:6.2.0:m1:*:*:community:*:*:*

cpe:2.3:a:liferay:liferay_portal:6.2.0:m2:*:*:community:*:*:*

cpe:2.3:a:liferay:liferay_portal:6.2.0:m3:*:*:community:*:*:*

cpe:2.3:a:liferay:liferay_portal:6.2.0:m4:*:*:community:*:*:*

cpe:2.3:a:liferay:liferay_portal:6.2.0:m5:*:*:community:*:*:*

cpe:2.3:a:liferay:liferay_portal:6.2.0:m6:*:*:community:*:*:*

cpe:2.3:a:liferay:liferay_portal:6.2.0:rc1:*:*:community:*:*:*

cpe:2.3:a:liferay:liferay_portal:6.2.0:rc2:*:*:community:*:*:*

+ 55 more

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References

Advisories & patches

REF https://www.liferay.com/downloads-community

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