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Vulnerabilities

Vulnerability · CVE-2026-20430

In wlan AP FW, there is a possible out of bounds write due to an incorrect bounds check.

Published Mar 2, 2026 · catalog updated Jun 17, 2026 · software development kit

Check if you run it

No confirmed exploitation is on record for CVE-2026-20430. EPSS is 0.24%. Act only if a listed version of software development kit is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.24%
Remediation
Advisory link
Affected products
cpe mediatek/software development kit · cpe openwrt/openwrt

In wlan AP FW, there is a possible out of bounds write due to an incorrect bounds check. This could lead to remote (proximal/adjacent) escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00467553; Issue ID: MSV-5151.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe mediatek/software development kitversion unspecified
  • cpe openwrt/openwrt19.07.0
  • cpe openwrt/openwrt21.02.0
  • cpe openwrt/openwrt23.05.0

How to fix CVE-2026-20430

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-20430. EPSS is 0.24%. Act only if a listed version of software development kit is installed.

Which versions are affected?

Compare what you have installed with 19.07.0, 21.02.0, 23.05.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-787: Out-of-bounds Write. EPSS 0.24%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 2, 2026 · NIST NVD

    Detected

    In wlan AP FW, there is a possible out of bounds write due to an incorrect bounds check. This could lead to remote (proximal/adjacent) escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00467553; Issue ID: MSV-5151.

  2. Jun 17, 2026 · NIST NVD

    Updated

    In wlan AP FW, there is a possible out of bounds write due to an incorrect bounds check. This could lead to remote (proximal/adjacent) escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00467553; Issue ID: MSV-5151.

Sources

  • CVE.orgVulnerability recordCVE-2026-20430

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-20430

    30-day exploitation probability 0.2%

    first.org
  • NIST NVDVulnerability recordCVE-2026-20430

    In wlan AP FW, there is a possible out of bounds write due to an incorrect bounds check. This could lead to remote (proximal/adjacent) escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00467553;

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.