CVE-2023-32843Public exploit

Modem reboot via malformed RRC uplink configuration

Published Dec 4, 2023 · Updated May 29, 2025

Reachable assertion in MediaTek 5G Modem NR15, NR16, and NR17 allows physically proximate attackers to reboot the modem via malformed RRC. During RRC attachment, a malicious gNB changes the 92nd downlink-transport-block byte, producing invalid uplink configuration fields that reach an assertion in nr_rfd_configdatabase.c. The pre-authentication trigger requires radio proximity and can repeatedly interrupt 5G connectivity while the modem reboots and recovers.

CVSS severity7.5
High
EPSS probability1.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in MediaTek 5G Modem NR15, NR16, and NR17 allows physically proximate attackers to reboot the modem via malformed RRC. During RRC attachment, a malicious gNB changes the 92nd downlink-transport-block byte, producing invalid uplink configuration fields that reach an assertion in nr_rfd_configdatabase.c. The pre-authentication trigger requires radio proximity and can repeatedly interrupt 5G connectivity while the modem reboots and recovers.

The record

CVE
CVE-2023-32843
Published
Dec 4, 2023
Updated
May 29, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 4, 2023CVE publishedPublication date reported by the CVE source.
  2. May 29, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

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No observations available

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

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499Endpoint Denial of Service

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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