CVE-2026-19959Public exploitNetwork attack vector

Authenticated stack overflow via unchecked strcat

Published Aug 16, 2026 · Updated Aug 16, 2026

Stack overflow in Edimax EW-7478APC 1.04 allows remote authenticated users to corrupt memory via pppUserName in formWanTcpipSetup. The handler appends the POST-controlled value with strcat() to the v163 stack buffer without checking the destination capacity. A valid browser-management session is required; the overwrite corrupts the handler stack and interrupts or subverts its execution.

CVSS severity9.9
Critical
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in Edimax EW-7478APC 1.04 allows remote authenticated users to corrupt memory via pppUserName in formWanTcpipSetup. The handler appends the POST-controlled value with strcat() to the v163 stack buffer without checking the destination capacity. A valid browser-management session is required; the overwrite corrupts the handler stack and interrupts or subverts its execution.

The record

CVE
CVE-2026-19959
Published
Aug 16, 2026
Updated
Aug 16, 2026
Vendor
Edimax Technology Co., Ltd.
Product
EW-7478APC
Classifications
CWE-121, CWE-119, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.04

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Edimax Technology Co., Ltd. · EW-7478APCversion=1.04

Published CVSS scores

9.9VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
9.9VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
8.6VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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