Tenda AC21 16.03.08.16 /goform/AdvSetMacMtuWan fromAdvSetMacMtuWan stack-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability labeled as critical has been found in Tenda AC21 16.03.08.16. The impacted element is the function fromAdvSetMacMtuWan of the file /goform/AdvSetMacMtuWan. The manipulation results in stack-based overflow. This vulnerability is identified as CVE-2026-1637. The attack can be executed remotely. Additionally, an exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, was found in Tenda AC21 16.03.08.16. Affected is the function fromAdvSetMacMtuWan of the file /goform/AdvSetMacMtuWan. The manipulation 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-2026-1637. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details and a public exploit are known.

The exploit is shared for download 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.

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

Productinfo

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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: 8.8
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.8
VulDB Temp Score: 8.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.8
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

01/29/2026 Advisory disclosed
01/29/2026 +0 days VulDB entry created
02/04/2026 +6 days VulDB entry last update

Sourcesinfo

Vendor: tenda.com.cn

Advisory: github.com
Status: Not defined

CVE: CVE-2026-1637 (🔒)
GCVE (CVE): GCVE-0-2026-1637
GCVE (VulDB): GCVE-100-343416
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 01/29/2026 18:01
Updated: 02/04/2026 03:53
Changes: 01/29/2026 18:01 (56), 01/30/2026 05:07 (31), 02/04/2026 03:53 (1)
Complete: 🔍
Submitter: LX-LX
Cache ID: 216::103

Submitinfo

Accepted

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