CVE-2023-20819Network attack vector

Remote privilege escalation via unchecked PPP write

Published Oct 2, 2023 · Updated Sep 21, 2024

Out-of-bounds write in MediaTek chipset modem firmware allows remote attackers to escalate privileges through crafted CDMA PPP traffic. The CDMA PPP implementation performs a write without first enforcing the required bounds check, allowing data to pass the destination boundary. No prior execution privilege or user interaction is required on modem branches LR11, LR12A, LR13, NR15, NR16, and NR17.

CVSS severity9.8

Critical

EPSS probability0.61%

Next 30 days · Sep 16, 2026

Known exploitationUnconfirmed

Based on sourced intelligence

Hinoki checkNot available

Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

The record

CVE: CVE-2023-20819
Published: Oct 2, 2023
Updated: Sep 21, 2024

Vendor: MediaTek
Product: MT6897
Classifications: CWE-787

Attack vector: network
Privileges: unauthenticated

Timeline

How it unfolded

Oct 2, 2023CVE publishedPublication date reported by the CVE source.
Sep 21, 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.

Affected versionversion=0 <=*

What conditions does exploitation require?

Attack vectornetwork

Required privilegesunauthenticated

What is affected?

MediaTek · MT6897version=0 <=*

MediaTek · MT8667version=0 <=*

MediaTek · MT8768version=0 <=*

MediaTek · MT6889version=0 <=*

MediaTek · MT6769Tversion=0 <=*

MediaTek · MT8666Aversion=0 <=*

MediaTek · MT6875version=0 <=*

MediaTek · MT2731version=0 <=*

MediaTek · MT6755version=0 <=*

MediaTek · MT8788Tversion=0 <=*

MediaTek · MT8768Bversion=0 <=*

MediaTek · MT6813version=0 <=*

MediaTek · MT6789version=0 <=*

MediaTek · MT6835version=0 <=*

MediaTek · MT6891version=0 <=*

MediaTek · MT6762Dversion=0 <=*

MediaTek · MT6768version=0 <=*

MediaTek · MediaTek MT6785version=0 <=*

MediaTek · MT6753version=0 <=*

MediaTek · MT6855version=0 <=*

MediaTek · MT6775version=0 <=*

MediaTek · MT8766version=0 <=*

MediaTek · MT6763version=0 <=*

MediaTek · MediaTek MT6765version=0 <=*

MediaTek · MT6797version=0 <=*

MediaTek · MT6785Tversion=0 <=*

MediaTek · MT6765Tversion=0 <=*

MediaTek · MT6893version=0 <=*

MediaTek · MT6885version=0 <=*

MediaTek · MT6769version=0 <=*

MediaTek · MT6799version=0 <=*

MediaTek · MT8768Tversion=0 <=*

MediaTek · MT8666version=0 <=*

MediaTek · MT8798version=0 <=*

MediaTek · MT6762Mversion=0 <=*

MediaTek · MT8791Tversion=0 <=*

MediaTek · MT6737version=0 <=*

MediaTek · MT6879version=0 <=*

MediaTek · MT6873version=0 <=*

MediaTek · MT8791version=0 <=*

MediaTek · MT6815version=0 <=*

MediaTek · MT6896version=0 <=*

MediaTek · MT6895Tversion=0 <=*

MediaTek · MT6781version=0 <=*

MediaTek · MT6739version=0 <=*

MediaTek · MT6877version=0 <=*

MediaTek · MediaTek MT6878version=0 <=*

MediaTek · MT6757version=0 <=*

MediaTek · MT6886version=0 <=*

MediaTek · MediaTek MT6761version=0 <=*

MediaTek · MT8786version=0 <=*

MediaTek · MT8675version=0 <=*

MediaTek · MT6737Mversion=0 <=*

MediaTek · MT6595version=0 <=*

MediaTek · MediaTek MT6762version=0 <=*

MediaTek · MT6853version=0 <=*

MediaTek · MT8781version=0 <=*

MediaTek · MT6732version=0 <=*

MediaTek · MT6738version=0 <=*

MediaTek · MT6875Tversion=0 <=*

MediaTek · MT6771version=0 <=*

MediaTek · MT6752version=0 <=*

MediaTek · MT8673version=0 <=*

MediaTek · MT6883version=0 <=*

MediaTek · MT6985version=0 <=*

MediaTek · MT8768Aversion=0 <=*

MediaTek · MT8788Xversion=0 <=*

MediaTek · MT6758version=0 <=*

MediaTek · MT8766Zversion=0 <=*

MediaTek · MT6570version=0 <=*

MediaTek · MT8788version=0 <=*

MediaTek · MT8788Zversion=0 <=*

MediaTek · MT6833version=0 <=*

MediaTek · MT6795version=0 <=*

MediaTek · MT8797version=0 <=*

MediaTek · MT6735version=0 <=*

MediaTek · MT6983version=0 <=*

MediaTek · MT6783version=0 <=*

MediaTek · MT6769Zversion=0 <=*

MediaTek · MediaTek MT6580version=0 <=*

MediaTek · MT8768Zversion=0 <=*

MediaTek · MT8765version=0 <=*

MediaTek · MediaTek MT6779version=0 <=*

MediaTek · MT6895version=0 <=*

MediaTek · MT6989version=0 <=*

MediaTek · MT6750Sversion=0 <=*

MediaTek · MT6767version=0 <=*

MediaTek · MT6750version=0 <=*

Published CVSS scores

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

6.7CISA-ADPCVSS:3.1/AV:L/AC:L/PR:H/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 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

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo