Wavlink NU516U1 251208 /cgi-bin/login.cgi sub_401A10 ipaddr out-of-bounds write

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.3$0-$5k0.13

Summaryinfo

A vulnerability classified as critical has been found in Wavlink NU516U1 251208. This vulnerability affects the function sub_401A10 of the file /cgi-bin/login.cgi. The manipulation of the argument ipaddr leads to out-of-bounds write. This vulnerability is traded as CVE-2026-3703. It is possible to initiate the attack remotely. Furthermore, there is an exploit available. It is recommended to upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Detailsinfo

A vulnerability was found in Wavlink NU516U1 251208. It has been rated as critical. This issue affects the function sub_401A10 of the file /cgi-bin/login.cgi. The manipulation of the argument ipaddr with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-3703. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful 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, responded in a very professional manner and quickly released a fixed version of the affected product.

Upgrading eliminates this vulnerability. The upgrade is hosted for download at dl.wavlink.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-10211). Several companies clearly confirm that VulDB is the primary source for best 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: 9.8
VulDB Meta Temp Score: 9.3

VulDB Base Score: 9.8
VulDB Temp Score: 8.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 9.8
CNA Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / 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: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: dl.wavlink.com

Timelineinfo

03/07/2026 Advisory disclosed
03/07/2026 +0 days VulDB entry created
03/12/2026 +5 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-3703 (🔒)
GCVE (CVE): GCVE-0-2026-3703
GCVE (VulDB): GCVE-100-349649
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 03/07/2026 10:01
Updated: 03/12/2026 14:39
Changes: 03/07/2026 10:01 (59), 03/08/2026 16:21 (31), 03/09/2026 01:03 (1), 03/12/2026 14:39 (1)
Complete: 🔍
Submitter: haimianbaobao
Cache ID: 216:6A0:103

Submitinfo

Accepted

  • Submit #759226: Wavlink NU516U1 V251208 Stack-based Buffer Overflow (by haimianbaobao)

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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