CVE-2024-20004Public exploit

Modem crash via invalid RRC CellGroupConfig

Published Feb 5, 2024 · Updated Aug 1, 2024

Improper input validation in MediaTek Modem NR15 allows physically proximate attackers to crash the modem with a crafted 5G RRC message. During RRC Attach, Modem NL1 accepts a Connection Setup sequence whose altered transport-block byte clears spCellConfig and changes cellGroupId, triggering a firmware assertion and reboot. Exploitation requires a malicious 5G base station within radio range, occurs before NAS authentication, and can repeatedly interrupt 3GPP connectivity.

CVSS severity7.5
High
EPSS probability1.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in MediaTek Modem NR15 allows physically proximate attackers to crash the modem with a crafted 5G RRC message. During RRC Attach, Modem NL1 accepts a Connection Setup sequence whose altered transport-block byte clears spCellConfig and changes cellGroupId, triggering a firmware assertion and reboot. Exploitation requires a malicious 5G base station within radio range, occurs before NAS authentication, and can repeatedly interrupt 3GPP connectivity.

The record

CVE
CVE-2024-20004
Published
Feb 5, 2024
Updated
Aug 1, 2024
Vendor
MediaTek
Product
MediaTek Modem
Classifications
CWE-20, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 5, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=MT2735
  2. Affected versionversion=MT6297
  3. Affected versionversion=MT6833
  4. Affected versionversion=MT6853
  5. Affected versionversion=MT6855
  6. Affected versionversion=MT6873
  7. Affected versionversion=MT6875
  8. Affected versionversion=MT6875T
  9. Affected versionversion=MT6877
  10. Affected versionversion=MT6880
  11. Affected versionversion=MT6883
  12. Affected versionversion=MT6885
  13. Affected versionversion=MT6889
  14. Affected versionversion=MT6890
  15. Affected versionversion=MT6891
  16. Affected versionversion=MT6893
  17. Affected versionversion=MT8675
  18. Affected versionversion=MT8791
  19. Affected versionversion=MT8791T
  20. Affected versionversion=MT8797

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

MediaTek · MediaTek Modemversion=MT2735; version=MT6297; version=MT6833; version=MT6853; version=MT6855; version=MT6873; version=MT6875; version=MT6875T; version=MT6877; version=MT6880; version=MT6883; version=MT6885; version=MT6889; version=MT6890; version=MT6891; version=MT6893; version=MT8675; version=MT8791; version=MT8791T; version=MT8797

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
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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