CVE-2022-21744Network attack vector

Unauthenticated code execution via unchecked PNCD size

Published Jul 6, 2022 · Updated Aug 3, 2024

Out-of-bounds write in MediaTek Modem 2G RR LR9, LR11, LR12, LR12A, LR13, NR15, and NR16 allows remote attackers to execute code. Its GPRS Packet Neighbour Cell Data decoder accepts an improper neighbouring-cell size without a bounds check and writes beyond the intended buffer. A crafted PNCD message reaches the flaw over the cellular network without authentication, execution privileges, or user interaction.

CVSS severity9.8
Critical
EPSS probability3.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in MediaTek Modem 2G RR LR9, LR11, LR12, LR12A, LR13, NR15, and NR16 allows remote attackers to execute code. Its GPRS Packet Neighbour Cell Data decoder accepts an improper neighbouring-cell size without a bounds check and writes beyond the intended buffer. A crafted PNCD message reaches the flaw over the cellular network without authentication, execution privileges, or user interaction.

The record

CVE
CVE-2022-21744
Published
Jul 6, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1664
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 6, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0NIST NVDAV:N/AC:L/Au:N/C:C/I:C/A:C

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-787Out-of-bounds Write
T1664Exploitation for Initial Access

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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