Wavlink WL-NU516U1 20251208 /cgi-bin/adm.cgi sub_40785C time_zone stack-based overflow

Summaryinfo

A vulnerability categorized as critical has been discovered in Wavlink WL-NU516U1 20251208. This affects the function sub_40785C of the file /cgi-bin/adm.cgi. Such manipulation of the argument time_zone leads to stack-based overflow. This vulnerability is uniquely identified as CVE-2026-2565. The attack can be launched remotely. Moreover, an exploit is present. The vendor was contacted early about this disclosure but did not respond in any way.

Detailsinfo

A vulnerability was found in Wavlink WL-NU516U1 20251208 and classified as critical. Affected by this issue is the function sub_40785C of the file /cgi-bin/adm.cgi. The manipulation of the argument time_zone with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to 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). Impacted is confidentiality, integrity, and availability.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-2565. The exploitation is known to be difficult. The attack may be launched remotely. Additional levels of successful authentication are required for exploitation. Technical details as well as a public exploit are known.

The exploit is available at github.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure but did not respond in any way.

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

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

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: 6.6
VulDB Meta Temp Score: 6.3

VulDB Base Score: 6.6
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.6
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
02/18/2026 +3 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Not defined

CVE: CVE-2026-2565 (🔒)
GCVE (CVE): GCVE-0-2026-2565
GCVE (VulDB): GCVE-100-346172
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 02/15/2026 20:45
Updated: 02/18/2026 15:38
Changes: 02/15/2026 20:45 (57), 02/16/2026 18:47 (31), 02/18/2026 15:38 (1)
Complete: 🔍
Submitter: haimianbaobao
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #751133: Wavlink NU516U1 V251208 Stack-based Buffer Overflow (by haimianbaobao)

Duplicate

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