Sign-up

ID

VAR-202308-3399


CVE

CVE-2023-40891


TITLE

Shenzhen Tenda Technology Co.,Ltd.  of  ac8v4  Out-of-bounds write vulnerability in firmware

Trust: 0.8

sources: JVNDB: JVNDB-2023-022717

DESCRIPTION

Tenda AC8 v4 US_AC8V4.0si_V16.03.34.06_cn was discovered to contain a stack overflow via parameter firewallEn at /goform/SetFirewallCfg. Shenzhen Tenda Technology Co.,Ltd. of ac8v4 An out-of-bounds write vulnerability exists in firmware.Information is obtained, information is tampered with, and service operation is interrupted. (DoS) It may be in a state. The Tenda AC8 is a dual-band gigabit wireless router designed for homes with fiber optic connections up to 1000 Mbps. It supports dual-band concurrent transmission rates of up to 1167 Mbps and is equipped with full gigabit ports (1 WAN port + 3 LAN ports), meeting broadband access needs from 100 to 1000 Mbps. An attacker can exploit this vulnerability by submitting a specially crafted request to cause the application to crash or execute arbitrary code in the application's context

Trust: 2.16

sources: NVD: CVE-2023-40891 // JVNDB: JVNDB-2023-022717 // CNVD: CNVD-2025-20714

IOT TAXONOMY

category:['Network device']sub_category: -

Trust: 0.6

sources: CNVD: CNVD-2025-20714

AFFECTED PRODUCTS

vendor:tendamodel:ac8scope:eqversion:16.03.34.06

Trust: 1.0

vendor:tendamodel:ac8v4scope:eqversion: -

Trust: 0.8

vendor:tendamodel:ac8v4scope:eqversion:ac8v4 firmware 16.03.34.06

Trust: 0.8

vendor:tendamodel:ac8v4scope: - version: -

Trust: 0.8

vendor:tendamodel:ac8 us ac8v4.0si v16.03.34.06 cnscope:eqversion:v4

Trust: 0.6

sources: CNVD: CNVD-2025-20714 // JVNDB: JVNDB-2023-022717 // NVD: CVE-2023-40891

CVSS

SEVERITY

CVSSV2

CVSSV3

nvd@nist.gov: CVE-2023-40891
value: CRITICAL

Trust: 1.0

NVD: CVE-2023-40891
value: CRITICAL

Trust: 0.8

CNVD: CNVD-2025-20714
value: HIGH

Trust: 0.6

CNVD: CNVD-2025-20714
severity: HIGH
baseScore: 10.0
vectorString: AV:N/AC:L/AU:N/C:C/I:C/A:C
accessVector: NETWORK
accessComplexity: LOW
authentication: NONE
confidentialityImpact: COMPLETE
integrityImpact: COMPLETE
availabilityImpact: COMPLETE
exploitabilityScore: 10.0
impactScore: 10.0
acInsufInfo: NONE
obtainAllPrivilege: NONE
obtainUserPrivilege: NONE
obtainOtherPrivilege: NONE
userInteractionRequired: NONE
version: 2.0

Trust: 0.6

nvd@nist.gov: CVE-2023-40891
baseSeverity: CRITICAL
baseScore: 9.8
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
attackVector: NETWORK
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: HIGH
integrityImpact: HIGH
availabilityImpact: HIGH
exploitabilityScore: 3.9
impactScore: 5.9
version: 3.1

Trust: 1.0

NVD: CVE-2023-40891
baseSeverity: CRITICAL
baseScore: 9.8
vectorString: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
attackVector: NETWORK
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: HIGH
integrityImpact: HIGH
availabilityImpact: HIGH
exploitabilityScore: NONE
impactScore: NONE
version: 3.0

Trust: 0.8

sources: CNVD: CNVD-2025-20714 // JVNDB: JVNDB-2023-022717 // NVD: CVE-2023-40891

PROBLEMTYPE DATA

problemtype:CWE-787

Trust: 1.0

problemtype:Out-of-bounds writing (CWE-787) [NVD evaluation ]

Trust: 0.8

sources: JVNDB: JVNDB-2023-022717 // NVD: CVE-2023-40891

EXTERNAL IDS

db:NVDid:CVE-2023-40891

Trust: 3.3

db:JVNDBid:JVNDB-2023-022717

Trust: 0.8

db:CNVDid:CNVD-2025-20714

Trust: 0.6

db:VULMONid:CVE-2023-40891

Trust: 0.1

sources: CNVD: CNVD-2025-20714 // VULMON: CVE-2023-40891 // JVNDB: JVNDB-2023-022717 // NVD: CVE-2023-40891

REFERENCES

url:https://github.com/peris-navince/founded-0-days/blob/main/ac8/formsetfirewallcfg/1.md

Trust: 2.5

url:https://nvd.nist.gov/vuln/detail/cve-2023-40891

Trust: 0.8

url:https://nvd.nist.gov

Trust: 0.1

sources: CNVD: CNVD-2025-20714 // VULMON: CVE-2023-40891 // JVNDB: JVNDB-2023-022717 // NVD: CVE-2023-40891

SOURCES

db:CNVDid:CNVD-2025-20714
db:VULMONid:CVE-2023-40891
db:JVNDBid:JVNDB-2023-022717
db:NVDid:CVE-2023-40891

LAST UPDATE DATE

2025-12-18T00:31:26.512000+00:00


SOURCES UPDATE DATE

db:CNVDid:CNVD-2025-20714date:2025-09-05T00:00:00
db:VULMONid:CVE-2023-40891date:2023-08-24T00:00:00
db:JVNDBid:JVNDB-2023-022717date:2024-01-24T01:57:00
db:NVDid:CVE-2023-40891date:2025-12-08T13:14:17.633

SOURCES RELEASE DATE

db:CNVDid:CNVD-2025-20714date:2025-09-05T00:00:00
db:VULMONid:CVE-2023-40891date:2023-08-24T00:00:00
db:JVNDBid:JVNDB-2023-022717date:2024-01-24T00:00:00
db:NVDid:CVE-2023-40891date:2023-08-24T18:15:07.643