CVE-2026-33192Public exploitNetwork attack vector

Internal behavior disclosure via unvalidated SUPI path

Published Mar 20, 2026 · Updated Mar 20, 2026

Improper error handling in free5GC UDM before 1.4.2 allows remote attackers to expose internal request-processing behavior. HandleModify accepts an empty UE ID from a double-slash Nudm_SDM path, forwards the malformed request to UDR as PUT, and converts its 400 response into 500 SYSTEM_FAILURE. The attacker must reach the UDM Nudm_SDM service; the consequence is erroneous failure signaling and disclosure of downstream handling, not reported data access or modification.

CVSS severity8.7
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper error handling in free5GC UDM before 1.4.2 allows remote attackers to expose internal request-processing behavior. HandleModify accepts an empty UE ID from a double-slash Nudm_SDM path, forwards the malformed request to UDR as PUT, and converts its 400 response into 500 SYSTEM_FAILURE. The attacker must reach the UDM Nudm_SDM service; the consequence is erroneous failure signaling and disclosure of downstream handling, not reported data access or modification.

The record

CVE
CVE-2026-33192
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
free5GC
Product
free5GC
Classifications
CWE-209
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 2026Record 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=< 1.4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

free5GC · free5GCversion=< 1.4.2

Published CVSS scores

8.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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 exploitPublished

Weakness, pattern, technique

CWE-209Generation of Error Message Containing Sensitive Information

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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