Wavlink WL-NU516U1 708c073-mt7628 nas.cgi fgets CONTENT_LENGTH stack-based overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
9.4$0-$5k1.21

Summaryinfo

A vulnerability labeled as critical has been found in Wavlink WL-NU516U1 708c073-mt7628. This impacts the function fgets of the file nas.cgi. The manipulation of the argument CONTENT_LENGTH results in stack-based overflow. This vulnerability is identified as CVE-2026-18588. The attack can be executed remotely. There is not any exploit available. The affected component should be upgraded. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Detailsinfo

A vulnerability classified as very critical has been found in Wavlink WL-NU516U1 708c073-mt7628. Affected is the function fgets of the file nas.cgi. The manipulation of the argument CONTENT_LENGTH with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as 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). This is going to have an impact on confidentiality, integrity, and availability.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-18588. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/02/2026).

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.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.4

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

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: 🔒
Status: Not defined
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

08/02/2026 Advisory disclosed
08/02/2026 +0 days VulDB entry created
08/02/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-18588 (🔒)
GCVE (CVE): GCVE-0-2026-18588
GCVE (VulDB): GCVE-100-385416

Entryinfo

Created: 08/02/2026 22:38
Changes: 08/02/2026 22:38 (57)
Complete: 🔍
Submitter: oduoke
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #850500: WAVLINK WL-NU516U1 2026-05-15 (build 708c073-mt7628) Command Injection (by oduoke)

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