CVE-2026-20423: In wlan STA driver, there is a possible out of bounds write due to a missing bounds check

Q: How do I fix CVE-2026-20423?

nbiot sdk: upgrade to newer than 3.8. Exact commands for each OS are on this page.

Q: Is CVE-2026-20423 being exploited?

CVE-2026-20423 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-20423 affect?

CVE-2026-20423 affects nbiot sdk. Severity is high (CVSS 7.8). In wlan STA driver, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WC

Routine

HIGH 7.8UPGRADE

CVE-2026-20423 is a high-severity flaw (CVSS 7.8) affecting nbiot sdk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In wlan STA driver, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00465314; Issue ID: MSV-4956.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 97%)
CISA exploited list	No
Weakness	CWE-749, CWE-787
Published	2026-03-02
Last modified	2026-06-17

Publisher (CNA): MediaTek, Inc. · Vendor: mediatek

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-02 09:16 UTCPublished CVE record published
2026-06-17 10:17 UTCUpdated Record last modified

mediatek nbiot sdk UPGRADE

Affected: <= 3.8

Fixed in: newer than 3.8

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy nbiot-sdk || rpm -q nbiot-sdk || nbiot-sdk --version

2. UPGRADE to newer than 3.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nbiot-sdk

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nbiot-sdk

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-20423?

nbiot sdk: upgrade to newer than 3.8. Exact commands for each OS are on this page.

Is CVE-2026-20423 being exploited?

CVE-2026-20423 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-20423 affect?

CVE-2026-20423 affects nbiot sdk. Severity is high (CVSS 7.8). In wlan STA driver, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WC

How urgent is CVE-2026-20423?

Priority 28/100. High severity

Related CVEs

CVE-2026-20436 MEDIUM 6.7 UPGRADE In wlan STA driver, there is a possible escalation of privilege due to a missing bounds check
CVE-2026-20419 MEDIUM 6.5 UPGRADE UPGRADE In wlan AP/STA firmware, there is a possible system becoming irresponsive due to an uncaught exception
CVE-2026-20407 CRITICAL 9.3 UPGRADE In wlan STA driver, there is a possible escalation of privilege due to a missing bounds check
CVE-2025-20687 MEDIUM 5.5 UPGRADE In Bluetooth driver, there is a possible out of bounds read due to an incorrect bounds check
CVE-2025-20680 CRITICAL 9.8 UPGRADE In Bluetooth driver, there is a possible out of bounds write due to an incorrect bounds check

References

← Back to latest CVEs