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T10 Firmware CVE-2025-9533

MEDIUM
Improper Authentication (CWE-287)
2025-08-27 cna@vuldb.com
5.5
CVSS 4.0 · NVD
View

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Authentication mechanism validation
MITRE ATT&CK

2 techniques across 2 tactics: Defense Evasion, Initial Access

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Impact

CVSS score of 6.9 (MEDIUM). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. EPSS exploitation probability: 0.19%.

Exploit ScenarioDerived

A remote attacker could bypass authentication mechanisms to gain unauthorized access by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 28, 2026

A vulnerability has been found in TOTOLINK T10 4.1.8cu.5241_B20210927. Rated medium severity (CVSS 6.9), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Implement multi-factor authentication, enforce strong password policies, use proven authentication frameworks.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Improper Authentication (CWE-287), which allows attackers to bypass authentication mechanisms to gain unauthorized access. A vulnerability has been found in TOTOLINK T10 4.1.8cu.5241_B20210927. Affected is an unknown function of the file /formLoginAuth.htm. The manipulation of the argument authCode with the input 1 leads to improper authentication. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. Affected products include: Totolink T10 Firmware.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 5.5 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Vulnerable system: Confidentiality
Low
Vulnerable system: Integrity
Low
Vulnerable system: Availability
Low
Subsequent system: Confidentiality
None
Subsequent system: Integrity
None
Subsequent system: Availability
None

Lifecycle Timeline

2
CVSS changed
Apr 29, 2026 - 01:11 NVD
6.9 (MEDIUM) 5.5 (MEDIUM)
CVE Published
Aug 27, 2025 - 15:15 nvd
MEDIUM 6.9

DescriptionCVE.org

A vulnerability has been found in TOTOLINK T10 4.1.8cu.5241_B20210927. Affected is an unknown function of the file /formLoginAuth.htm. The manipulation of the argument authCode with the input 1 leads to improper authentication. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

Executive ViewAI

Why It Matters

Organizations using A vulnerability should be aware of notable risk from CVE-2025-9533, a improper authentication vulnerability rated CVSS 6.9. This could allow unauthorized access to protected resources. Organizations should apply vendor updates when available and monitor for exploitation.

Business Impact: Moderate
Compensating Controls

Apply vendor patch. If patching is delayed: restrict network access, enable MFA, monitor auth logs.

Threat Intelligence Overview

EPSS Score
0.2%
Top 59% exploitable
Data Quality
5 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.2%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes

Priority Score

28
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +28
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)CVE.org

cpe:2.3:o:totolink:t10_firmware:4.1.8cu.5241_b20210927:*:*:*:*:*:*:*
CVE-2024-8162 CRITICAL POC
9.3 Aug 26

A vulnerability classified as critical has been found in TOTOLINK T10 AC1200 4.1.8cu.5207. Rated critical severity (CVSS

CVE-2025-5905 HIGH POC
8.8 Jun 10

Critical buffer overflow vulnerability in TOTOLINK T10 firmware version 4.1.8cu.5207 affecting the WiFi repeater configu

CVE-2025-5904 HIGH POC
8.8 Jun 10

A critical buffer overflow vulnerability exists in TOTOLINK T10 firmware version 4.1.8cu.5207 in the setWiFiMeshName fun

CVE-2025-5903 HIGH POC
8.8 Jun 10

Critical buffer overflow vulnerability in TOTOLINK T10 firmware version 4.1.8cu.5207 affecting the setWiFiAclRules funct

CVE-2025-5902 HIGH POC
8.8 Jun 09

Critical remote buffer overflow vulnerability in TOTOLINK T10 firmware version 4.1.8cu.5207 affecting the setUpgradeFW f

CVE-2025-5901 HIGH POC
8.8 Jun 09

Critical buffer overflow vulnerability in TOTOLINK T10 firmware version 4.1.8cu.5207 affecting the UploadCustomModule fu

CVE-2025-6138 HIGH POC
8.8 Jun 16

Critical buffer overflow vulnerability in TOTOLINK T10 firmware version 4.1.8cu.5207 affecting the HTTP POST request han

CVE-2025-6137 HIGH POC
8.8 Jun 16

Critical buffer overflow vulnerability in TOTOLINK T10 firmware version 4.1.8cu.5207 affecting the setWiFiScheduleCfg fu

CVE-2024-8577 HIGH POC
8.7 Sep 08

A vulnerability was found in TOTOLINK AC1200 T8 and AC1200 T10 4.1.5cu.861_B20230220/4.1.8cu.5207. Rated high severity (

CVE-2024-8576 HIGH POC
8.7 Sep 08

A vulnerability was found in TOTOLINK AC1200 T8 and AC1200 T10 4.1.5cu.861_B20230220/4.1.8cu.5207. Rated high severity (

CVE-2024-8573 HIGH POC
8.7 Sep 08

A vulnerability, which was classified as critical, was found in TOTOLINK AC1200 T8 and AC1200 T10 4.1.5cu.861_B20230220/

CVE-2025-44655 CRITICAL
9.8 Jul 21

Privilege escalation and unauthorized file access affects TOTOLINK A7100RU (V7.4), A950RG (V5.9), and T10 (V5.9) routers

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