CVE-2023-4612Network attack vector

MFA bypass via spoofed trusted-device address

Published Nov 9, 2023 · Updated Feb 26, 2025

Improper authentication in Apereo CAS through 7.0.0-RC7 allows remote attackers to bypass MFA by spoofing a trusted device. Trusted-device verification relies on the address returned by HttpServletRequest.getRemoteAddr without establishing that the address authentically identifies the saved device. Exploitation requires valid primary credentials, enabled trusted-device recognition, and control of the evaluated address; success skips the second factor.

CVSS severity9.8
Critical
EPSS probability0.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Apereo CAS through 7.0.0-RC7 allows remote attackers to bypass MFA by spoofing a trusted device. Trusted-device verification relies on the address returned by HttpServletRequest.getRemoteAddr without establishing that the address authentically identifies the saved device. Exploitation requires valid primary credentials, enabled trusted-device recognition, and control of the evaluated address; success skips the second factor.

The record

CVE
CVE-2023-4612
Published
Nov 9, 2023
Updated
Feb 26, 2025
Vendor
Apereo
Product
Apereo CAS
Classifications
CWE-302
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=7.0.0-RC7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apereo · Apereo CASversion=0 <=7.0.0-RC7

Published CVSS scores

9.8NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-302Authentication Bypass by Assumed-Immutable Data

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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