CVE-2026-5004Public exploitNetwork attack vector

Authenticated code execution via UpnpEnabled stack overwrite

Published Mar 28, 2026 · Updated Mar 28, 2026

Stack-based buffer overflow in Wavlink WL-WN579X3-C 231124 allows remote authenticated users to execute code via a crafted UPnP setting. In firewall.cgi, sub_4019FC passes attacker-controlled UpnpEnabled data to uci_init_ptr, which writes 40 bytes into an eight-byte stack buffer and overwrites the return address. A valid web-management session is required; the demonstrated request corrupts control flow and crashes the CGI process, while precise overwrite data enables code execution on the device.

CVSS severity8.8
High
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Wavlink WL-WN579X3-C 231124 allows remote authenticated users to execute code via a crafted UPnP setting. In firewall.cgi, sub_4019FC passes attacker-controlled UpnpEnabled data to uci_init_ptr, which writes 40 bytes into an eight-byte stack buffer and overwrites the return address. A valid web-management session is required; the demonstrated request corrupts control flow and crashes the CGI process, while precise overwrite data enables code execution on the device.

The record

CVE
CVE-2026-5004
Published
Mar 28, 2026
Updated
Mar 28, 2026
Vendor
Wavlink
Product
WL-WN579X3-C Firmware
Classifications
CWE-119, CWE-121, CWE-787, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 28, 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=231124

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Wavlink · WL-WN579X3-C Firmwareversion=231124

Published CVSS scores

7.4VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
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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