Zyxel NWA1100-N 1.00(AACE.1)C0 HTTP buffer overflow

Summaryinfo

A vulnerability identified as critical has been detected in Zyxel NWA1100-N 1.00(AACE.1)C0. This affects the function formWep/formWlAc/formPasswordSetup/formUpgradeCert/formDelcert of the component HTTP Handler. Performing a manipulation results in buffer overflow. This vulnerability only affects products that are no longer supported by the maintainer. This vulnerability is identified as CVE-2026-7287. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Zyxel NWA1100-N 1.00(AACE.1)C0. It has been classified as very critical. This affects the function formWep/formWlAc/formPasswordSetup/formUpgradeCert/formDelcert of the component HTTP Handler. The manipulation with an unknown input leads to a buffer overflow vulnerability. CWE is classifying the issue as CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

** UNSUPPORTED WHEN ASSIGNED ** A buffer overflow vulnerability in the formWep(), formWlAc(), formPasswordSetup(), formUpgradeCert(), and formDelcert() functions of the “webs” binary in Zyxel NWA1100-N customized firmware version 1.00(AACE.1)C0 could allow an attacker to trigger a denial-of-service (DoS) condition by sending a crafted HTTP request to a vulnerable device.

It is possible to read the advisory at zyxel.com. This vulnerability is uniquely identified as CVE-2026-7287 since 04/28/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/12/2026).

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-29378). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• Zyxel

Name

• NWA1100-N

Version

• 1.00(AACE.1)C0

License

• commercial

Support

• end of life

Website

• Vendor: https://www.zyxel.com/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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