CVE-2025-20674: In wlan AP driver, there is a possible way to inject arbitrary packet due to a missing permission check

Q: How do I fix CVE-2025-20674?

openwrt: mitigate or apply the listed mitigation; software development kit: upgrade to newer than 7.6.7.2. Exact commands for each OS are on this page.

Q: Is CVE-2025-20674 being exploited?

CVE-2025-20674 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-2025-20674 affect?

CVE-2025-20674 affects openwrt, software development kit. Severity is critical (CVSS 9.8). In wlan AP driver, there is a possible way to inject arbitrary packet due to a missing permission check. This could lead to remote escalation of privilege with no additional execution privileges needed. User interaction is not needed for ex

Q: How urgent is CVE-2025-20674?

Priority 53/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEMITIGATEUPGRADE

CVE-2025-20674 is a critical-severity flaw (CVSS 9.8) affecting openwrt, software development kit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In wlan AP driver, there is a possible way to inject arbitrary packet due to a missing permission check. This could lead to remote escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00413202; Issue ID: MSV-3303.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-863
Published	2025-06-02
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2025-06-02 03:15 UTCPublished CVE record published
2026-06-17 08:41 UTCUpdated Record last modified

openwrt openwrt MITIGATE

Affected: 19.07.0 · 21.02.0 · 23.05

Fixed in: no fixed release known

Safe to downgrade to: a release before 19.07.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

mediatek software development kit UPGRADE

Affected: <= 7.6.7.2

Fixed in: newer than 7.6.7.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy software-development-kit || rpm -q software-development-kit || software-development-kit --version

2. UPGRADE to newer than 7.6.7.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade software-development-kit

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade software-development-kit

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-2025-20674?

openwrt: mitigate or apply the listed mitigation; software development kit: upgrade to newer than 7.6.7.2. Exact commands for each OS are on this page.

Is CVE-2025-20674 being exploited?

CVE-2025-20674 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-2025-20674 affect?

CVE-2025-20674 affects openwrt, software development kit. Severity is critical (CVSS 9.8). In wlan AP driver, there is a possible way to inject arbitrary packet due to a missing permission check. This could lead to remote escalation of privilege with no additional execution privileges needed. User interaction is not needed for ex

How urgent is CVE-2025-20674?

Priority 53/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

OpenWrt vulnerabilities

Related CVEs

CVE-2025-20742 HIGH 8.0 UPGRADE MITIGATE In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check
CVE-2025-20746 MEDIUM 6.7 DOWNGRADE DOWNGRADE In gnss service, there is a possible out of bounds write due to an incorrect bounds check
CVE-2025-20747 MEDIUM 6.7 DOWNGRADE DOWNGRADE In gnss service, there is a possible out of bounds write due to an incorrect bounds check
CVE-2025-20733 HIGH 7.8 UPGRADE MITIGATE In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check
CVE-2025-20735 HIGH 7.8 UPGRADE MITIGATE In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check

References

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