Wavlink WL-NU516U1 20251208 /cgi-bin/nas.cgi sub_401218 User1Passwd stack-based overflow

Summaryinfo

A vulnerability labeled as critical has been found in Wavlink WL-NU516U1 20251208. This issue affects the function sub_401218 of the file /cgi-bin/nas.cgi. Executing a manipulation of the argument User1Passwd can lead to stack-based overflow. The identification of this vulnerability is CVE-2026-2567. The attack may be launched remotely. Furthermore, there is an exploit available.

Detailsinfo

A vulnerability was found in Wavlink WL-NU516U1 20251208. It has been declared as critical. This vulnerability affects the function sub_401218 of the file /cgi-bin/nas.cgi. The manipulation of the argument User1Passwd with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect confidentiality, integrity, and availability.

The advisory is available at github.com. This vulnerability was named CVE-2026-2567. The exploitation appears to be easy. The attack can be initiated remotely. Additional levels of successful authentication are needed for exploitation. Technical details and also a public exploit are known.

It is possible to download the exploit at github.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

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Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 7.2
VulDB Meta Temp Score: 6.8

VulDB Base Score: 7.2
VulDB Temp Score: 6.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.2
CNA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

02/15/2026 Advisory disclosed
02/15/2026 +0 days VulDB entry created
02/20/2026 +5 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Not defined

CVE: CVE-2026-2567 (🔒)
GCVE (CVE): GCVE-0-2026-2567
GCVE (VulDB): GCVE-100-346174
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 02/15/2026 20:45
Updated: 02/20/2026 10:46
Changes: 02/15/2026 20:45 (56), 02/16/2026 21:43 (31), 02/20/2026 10:46 (1)
Complete: 🔍
Submitter: haimianbaobao
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #752016: Wavlink NU516U1 V251208 Stack-based Buffer Overflow (by haimianbaobao)

Duplicate

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