CVE-2024-29153Network attack vector

Network downgrade and service interruption via unauthorized signaling

Published Jul 9, 2024 · Updated Aug 2, 2024

Incorrect authorization in Samsung Exynos Modem 5123 and 5300 allows remote attackers to downgrade LTE connections and repeatedly disrupt service. The modem accepts LTE Non-Access Stratum messages without the required authorization checks, causing fallback to lower network generations and repeated denial-of-service conditions. A remote attacker must deliver unauthorized LTE NAS signaling to an affected modem; published material does not identify the exact message type or required network position.

CVSS severity8.1
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Samsung Exynos Modem 5123 and 5300 allows remote attackers to downgrade LTE connections and repeatedly disrupt service. The modem accepts LTE Non-Access Stratum messages without the required authorization checks, causing fallback to lower network generations and repeated denial-of-service conditions. A remote attacker must deliver unauthorized LTE NAS signaling to an affected modem; published material does not identify the exact message type or required network position.

The record

CVE
CVE-2024-29153
Published
Jul 9, 2024
Updated
Aug 2, 2024
Vendor
Samsung Electronics
Product
Exynos Modem
Classifications
CWE-400, T1464
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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=5123
  2. Affected versionversion=5300

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Samsung Electronics · Exynos Modemversion=5123; version=5300

Published CVSS scores

8.1MITRECVSS:3.1/AV:N/AC:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1464Network Denial of Service

Public exploit references

No public exploit references are available in this record.

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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