CVE-2023-20702Network attack vector

Remote service interruption via unchecked RLC SDU

Published Nov 6, 2023 · Updated Sep 5, 2024

NULL pointer dereference in MediaTek 5G NRLC for Modem NR15, NR16, and NR17 allows remote attackers to interrupt UE service. The NRLC error path fails to reject an invalid one-byte RLC SDU before an operation that accesses a null pointer. No authentication, additional privileges, or user interaction is required; the documented consequence is limited to availability.

CVSS severity7.5
High
EPSS probability1.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in MediaTek 5G NRLC for Modem NR15, NR16, and NR17 allows remote attackers to interrupt UE service. The NRLC error path fails to reject an invalid one-byte RLC SDU before an operation that accesses a null pointer. No authentication, additional privileges, or user interaction is required; the documented consequence is limited to availability.

The record

CVE
CVE-2023-20702
Published
Nov 6, 2023
Updated
Sep 5, 2024
Vendor
MediaTek
Product
MT6889
Classifications
CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 6, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 5, 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=0 <=*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MediaTek · MT6889version=0 <=*
MediaTek · MT6875version=0 <=*
MediaTek · MT6835version=0 <=*
MediaTek · MT6980version=0 <=*
MediaTek · MT6990version=0 <=*
MediaTek · MT6885version=0 <=*
MediaTek · MT8798version=0 <=*
MediaTek · MT8791Tversion=0 <=*
MediaTek · MT6879version=0 <=*
MediaTek · MT6873version=0 <=*
MediaTek · MT8791version=0 <=*
MediaTek · MT6886version=0 <=*
MediaTek · MT8675version=0 <=*
MediaTek · MT8673version=0 <=*
MediaTek · MT6883version=0 <=*
MediaTek · MT6985version=0 <=*
MediaTek · MT8797version=0 <=*
MediaTek · MT6983version=0 <=*
MediaTek · MT6895version=0 <=*

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.

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-476NULL Pointer Dereference
T1499Endpoint 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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