Sign-up

ID

VAR-202508-0592


CVE

CVE-2025-8939


TITLE

Shenzhen Tenda Technology Co.,Ltd.  of  AC20  Buffer error vulnerability in firmware

Trust: 0.8

sources: JVNDB: JVNDB-2025-011906

DESCRIPTION

A vulnerability was determined in Tenda AC20 up to 16.03.08.12. Affected is an unknown function of the file /goform/WifiGuestSet. The manipulation of the argument shareSpeed leads to buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. Shenzhen Tenda Technology Co.,Ltd. of AC20 The firmware contains a buffer error vulnerability and a classic buffer overflow vulnerability.Information is obtained, information is tampered with, and service operation is interrupted. (DoS) It may be in a state. This vulnerability stems from the failure of the shareSpeed parameter in the /goform/WifiGuestSet file to properly validate the length of input data. An attacker could exploit this vulnerability to execute arbitrary code on the system or cause a denial of service

Trust: 2.16

sources: NVD: CVE-2025-8939 // JVNDB: JVNDB-2025-011906 // CNVD: CNVD-2025-24481

IOT TAXONOMY

category:['Network device']sub_category: -

Trust: 0.6

sources: CNVD: CNVD-2025-24481

AFFECTED PRODUCTS

vendor:tendamodel:ac20scope:gteversion:16.03.08.0

Trust: 1.0

vendor:tendamodel:ac20scope:lteversion:16.03.08.12

Trust: 1.0

vendor:tendamodel:ac20scope:eqversion:ac20 firmware 16.03.08.0 to 16.03.08.12

Trust: 0.8

vendor:tendamodel:ac20scope: - version: -

Trust: 0.8

vendor:tendamodel:ac20scope:eqversion: -

Trust: 0.8

vendor:tendamodel:ac20scope:lteversion:<=16.03.08.12

Trust: 0.6

sources: CNVD: CNVD-2025-24481 // JVNDB: JVNDB-2025-011906 // NVD: CVE-2025-8939

CVSS

SEVERITY

CVSSV2

CVSSV3

cna@vuldb.com: CVE-2025-8939
value: HIGH

Trust: 1.0

OTHER: JVNDB-2025-011906
value: HIGH

Trust: 0.8

CNVD: CNVD-2025-24481
value: HIGH

Trust: 0.6

cna@vuldb.com: CVE-2025-8939
severity: HIGH
baseScore: 9.0
vectorString: AV:N/AC:L/AU:S/C:C/I:C/A:C
accessVector: NETWORK
accessComplexity: LOW
authentication: SINGLE
confidentialityImpact: COMPLETE
integrityImpact: COMPLETE
availabilityImpact: COMPLETE
exploitabilityScore: 8.0
impactScore: 10.0
acInsufInfo: NONE
obtainAllPrivilege: NONE
obtainUserPrivilege: NONE
obtainOtherPrivilege: NONE
userInteractionRequired: NONE
version: 2.0

Trust: 1.0

OTHER: JVNDB-2025-011906
severity: HIGH
baseScore: 9.0
vectorString: AV:N/AC:L/AU:S/C:C/I:C/A:C
accessVector: NETWORK
accessComplexity: LOW
authentication: SINGLE
confidentialityImpact: COMPLETE
integrityImpact: COMPLETE
availabilityImpact: COMPLETE
exploitabilityScore: NONE
impactScore: NONE
acInsufInfo: NONE
obtainAllPrivilege: NONE
obtainUserPrivilege: NONE
obtainOtherPrivilege: NONE
userInteractionRequired: NONE
version: 2.0

Trust: 0.8

CNVD: CNVD-2025-24481
severity: HIGH
baseScore: 9.0
vectorString: AV:N/AC:L/AU:S/C:C/I:C/A:C
accessVector: NETWORK
accessComplexity: LOW
authentication: SINGLE
confidentialityImpact: COMPLETE
integrityImpact: COMPLETE
availabilityImpact: COMPLETE
exploitabilityScore: 8.0
impactScore: 10.0
acInsufInfo: NONE
obtainAllPrivilege: NONE
obtainUserPrivilege: NONE
obtainOtherPrivilege: NONE
userInteractionRequired: NONE
version: 2.0

Trust: 0.6

cna@vuldb.com: CVE-2025-8939
baseSeverity: HIGH
baseScore: 8.8
vectorString: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
attackVector: NETWORK
attackComplexity: LOW
privilegesRequired: LOW
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: HIGH
integrityImpact: HIGH
availabilityImpact: HIGH
exploitabilityScore: 2.8
impactScore: 5.9
version: 3.1

Trust: 1.0

OTHER: JVNDB-2025-011906
baseSeverity: HIGH
baseScore: 8.8
vectorString: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
attackVector: NETWORK
attackComplexity: LOW
privilegesRequired: LOW
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: HIGH
integrityImpact: HIGH
availabilityImpact: HIGH
exploitabilityScore: NONE
impactScore: NONE
version: 3.0

Trust: 0.8

sources: CNVD: CNVD-2025-24481 // JVNDB: JVNDB-2025-011906 // NVD: CVE-2025-8939

PROBLEMTYPE DATA

problemtype:CWE-119

Trust: 1.0

problemtype:CWE-120

Trust: 1.0

problemtype:Buffer error (CWE-119) [ others ]

Trust: 0.8

problemtype: Classic buffer overflow (CWE-120) [ others ]

Trust: 0.8

sources: JVNDB: JVNDB-2025-011906 // NVD: CVE-2025-8939

EXTERNAL IDS

db:NVDid:CVE-2025-8939

Trust: 3.2

db:VULDBid:319902

Trust: 1.8

db:JVNDBid:JVNDB-2025-011906

Trust: 0.8

db:CNVDid:CNVD-2025-24481

Trust: 0.6

sources: CNVD: CNVD-2025-24481 // JVNDB: JVNDB-2025-011906 // NVD: CVE-2025-8939

REFERENCES

url:https://github.com/lin-3-start/lin-cve/blob/main/tenda%20ac20/tenda%20ac20.md

Trust: 2.4

url:https://github.com/lin-3-start/lin-cve/blob/main/tenda%20ac20/tenda%20ac20.md#3-poc

Trust: 1.8

url:https://vuldb.com/?id.319902

Trust: 1.8

url:https://vuldb.com/?submit.631829

Trust: 1.8

url:https://www.tenda.com.cn/

Trust: 1.8

url:https://vuldb.com/?ctiid.319902

Trust: 1.0

url:https://nvd.nist.gov/vuln/detail/cve-2025-8939

Trust: 0.8

sources: CNVD: CNVD-2025-24481 // JVNDB: JVNDB-2025-011906 // NVD: CVE-2025-8939

SOURCES

db:CNVDid:CNVD-2025-24481
db:JVNDBid:JVNDB-2025-011906
db:NVDid:CVE-2025-8939

LAST UPDATE DATE

2025-11-19T23:27:12.191000+00:00


SOURCES UPDATE DATE

db:CNVDid:CNVD-2025-24481date:2025-10-22T00:00:00
db:JVNDBid:JVNDB-2025-011906date:2025-08-21T04:31:00
db:NVDid:CVE-2025-8939date:2025-08-19T18:35:22.420

SOURCES RELEASE DATE

db:CNVDid:CNVD-2025-24481date:2025-10-21T00:00:00
db:JVNDBid:JVNDB-2025-011906date:2025-08-21T00:00:00
db:NVDid:CVE-2025-8939date:2025-08-14T06:15:28.913