CVE-2023-4612 | MFA bypass in Apereo CAS

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.

Published: 2023-11-09 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-4612 is rated Moderate Risk (59.8/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.94%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-4612

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.04% 0.94% +0.90%
2 2025-11-21 0.36% 0.04% -0.32%
3 2025-11-18 — 0.36% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-4612

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2023-4612

Affected software / configurations for CVE-2023-4612

Vendor Product Version Raw CPE
apereo central_authentication_service < 7.0.0 cpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:*
apereo central_authentication_service 7.0.0 cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc1:*:*:*:*:*:*
apereo central_authentication_service 7.0.0 cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc2:*:*:*:*:*:*
apereo central_authentication_service 7.0.0 cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc3:*:*:*:*:*:*
apereo central_authentication_service 7.0.0 cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc4:*:*:*:*:*:*
apereo central_authentication_service 7.0.0 cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc5:*:*:*:*:*:*
apereo central_authentication_service 7.0.0 cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc6:*:*:*:*:*:*
apereo central_authentication_service 7.0.0 cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc7:*:*:*:*:*:*

References for CVE-2023-4612

cvelogic Threat Intelligence