CVE-2026-2567Public exploitNetwork attack vector

Authenticated code execution via password escaping overflow

Published Feb 16, 2026 · Updated Feb 16, 2026

Stack buffer overflow in Wavlink WL-NU516U1 firmware 20251208 allows remote authenticated users to hijack execution via User1Passwd. In sub_4051B0, each password character is prefixed with a backslash and appended by strcat to a 128-byte stack buffer without bounds checks. A valid session cookie and enable_storage_management=1 are required; the published request demonstrates a CGI crash, while return-address overwrite permits execution-flow hijacking.

CVSS severity7.2
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 buffer overflow in Wavlink WL-NU516U1 firmware 20251208 allows remote authenticated users to hijack execution via User1Passwd. In sub_4051B0, each password character is prefixed with a backslash and appended by strcat to a 128-byte stack buffer without bounds checks. A valid session cookie and enable_storage_management=1 are required; the published request demonstrates a CGI crash, while return-address overwrite permits execution-flow hijacking.

The record

CVE
CVE-2026-2567
Published
Feb 16, 2026
Updated
Feb 16, 2026
Vendor
Wavlink
Product
WL-NU516U1
Classifications
CWE-119, CWE-121, CWE-787, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 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=20251208

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Wavlink · WL-NU516U1version=20251208

Published CVSS scores

7.2VulDBCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
7.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
8.3VulDBAV:N/AC:L/Au:M/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 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-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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