What is the CVSS score of CVE-2023-4612?

CVE-2023-4612 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: 0.9%.

Central Authentication Service CVE-2023-4612

CRITICAL

Authentication Bypass by Assumed-Immutable Data (CWE-302)

2023-11-09 cvd@cert.pl

Authentication Bypass Central Authentication Service Apereo

9.8

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-302 OWASP Top 10:2025 A07:2025 - Authentication Failures ASVS 5.0 V6 - Authentication Data mutability checks in auth
Impact	CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the critical-severity affected system.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.

No patch listed yet 0.9% exploitation probability (EPSS)

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AnalysisAI

Improper Authentication vulnerability in Apereo CAS in jakarta.servlet.http.HttpServletRequest.getRemoteAddr method allows Multi-Factor Authentication bypass.0.0-RC7. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

This vulnerability is classified under CWE-302. Improper Authentication vulnerability in Apereo CAS in jakarta.servlet.http.HttpServletRequest.getRemoteAddr method allows Multi-Factor Authentication bypass.0.0-RC7. It is unknown whether in new versions the issue will be fixed. For the date of publication there is no patch, and the vendor does not treat it as a vulnerability. Affected products include: Apereo Central Authentication Service. Version information: through 7.0.0.

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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

Improper Authentication vulnerability in Apereo CAS in jakarta.servlet.http.HttpServletRequest.getRemoteAddr method allows Multi-Factor Authentication bypass.This issue affects CAS: through 7.0.0-RC7. It is unknown whether in new versions the issue will be fixed. For the date of publication there is no patch, and the vendor does not treat it as a vulnerability.

Threat Intelligence Overview

EPSS Score

0.9%

Top 43% exploitable

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 No

EPSS 0.9%

Patch available No

Active threat No

Deciding rule

CRITICAL severity

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

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +49

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)NVD

cpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:*

cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc1:*:*:*:*:*:*

cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc2:*:*:*:*:*:*

cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc3:*:*:*:*:*:*

cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc4:*:*:*:*:*:*

cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc5:*:*:*:*:*:*

cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc6:*:*:*:*:*:*

cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc7:*:*:*:*:*:*

More in Central Authentication Service

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9.1 May 23

The does not validate a parameter before making a request to it, which could allow unauthenticated users to perform SSRF

CVE-2019-10754 HIGH This Week POC

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Multiple classes used within Apereo CAS before release 6.1.0-RC5 makes use of apache commons-lang3 RandomStringUtils for

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Apereo CAS 5.3.x before 5.3.16, 6.x before 6.1.7.2, 6.2.x before 6.2.4, and 6.3.x before 6.3.0-RC4 mishandles secret key

CVE-2025-3986 MEDIUM This Month

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A vulnerability was found in Apereo CAS 5.2.6. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploita

CVE-2025-3985 MEDIUM This Month

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A vulnerability was found in Apereo CAS 5.2.6. Rated medium severity (CVSS 5.1), this vulnerability is remotely exploita

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A vulnerability was found in Apereo CAS 5.2.6 and classified as critical. Rated low severity (CVSS 2.3), this vulnerabil

Same weakness CWE-302 – Authentication Bypass by Assumed-Immutable Data

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CVE-2024-0012 CRITICAL POC

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References

Advisories & patches

REF https://cert.pl/en/posts/2023/11/CVE-2023-4612/ REF https://cert.pl/posts/2023/11/CVE-2023-4612/

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