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A3100R Firmware CVE-2021-46009

CRITICAL
Missing Authentication for Critical Function (CWE-306)
2022-03-30 cve@mitre.org
Authentication Bypass A3100R Firmware TOTOLINK
9.8
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-306
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Authentication required for critical functions
MITRE ATT&CK

1 technique across 1 tactic: Initial Access

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

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Impact

CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available. EPSS exploitation probability: 15.23%.
Exploit ScenarioDerived

A remote attacker could access critical functionality without authentication by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.
Emergency Immediate action required. Why: CRITICAL + active threat signals, no patch available.
No patch listed yet 15.2% exploitation probability (EPSS)

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AnalysisAI

In Totolink A3100R V5.9c.4577, multiple pages can be read by curl or Burp Suite without authentication. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and EPSS exploitation probability 15.2%.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Require authentication for all sensitive operations, implement defense in depth.

Affects your stack

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Technical ContextAI · show details

This vulnerability is classified as Missing Authentication for Critical Function (CWE-306), which allows attackers to access critical functionality without authentication. In Totolink A3100R V5.9c.4577, multiple pages can be read by curl or Burp Suite without authentication. Additionally, admin configurations can be set without cookies. Affected products include: Totolink A3100R Firmware.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionNVD

In Totolink A3100R V5.9c.4577, multiple pages can be read by curl or Burp Suite without authentication. Additionally, admin configurations can be set without cookies.

Threat Intelligence Overview

EPSS Score
15.2%
Top 4% exploitable
Exploit
POC
Public exploit code exists
Data Quality
4 sources
Confidence: Medium
NVD CVE.org EPSS VulDB

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 CRITICAL
CISA KEV No
Public POC Yes
EPSS 15.2%
Patch available No
Active threat Yes
Deciding rule
CRITICAL + active threat signals, no patch available
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

SSVC Decision· derived
Scheduled
Exploitation· derived
Poc
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
Medium

Priority Score

84
Low Medium High Critical
KEV: 0
EPSS: +15
CVSS: +49
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

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

Affected Products (CPE)NVD

cpe:2.3:o:totolink:a3100r_firmware:5.9c.4577:*:*:*:*:*:*:*

More in A3100R Firmware

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CVE-2025-28036 CRITICAL POC
9.8 Apr 22

TOTOLINK A950RG V4.1.2cu.5161_B20200903 was found to contain a pre-auth remote command execution vulnerability in the se
CVE-2025-28035 CRITICAL POC
9.8 Apr 22

TOTOLINK A830R V4.1.2cu.5182_B20201102 was found to contain a pre-auth remote command execution vulnerability in the set
CVE-2025-28034 CRITICAL POC
9.8 Apr 22

TOTOLINK A800R V4.1.2cu.5137_B20200730, A810R V4.1.2cu.5182_B20201026, A830R V4.1.2cu.5182_B20201102, A950RG V4.1.2cu.51
CVE-2025-45790 CRITICAL POC
9.8 May 08

TOTOLINK A3100R V5.9c.1527 is vulnerable to Buffer Overflow via the priority parameter in the setMacQos interface of /li
CVE-2025-45789 CRITICAL POC
9.8 May 08

TOTOLINK A3100R V5.9c.1527 is vulnerable to buffer overflow via the urlKeyword parameter in setParentalRules. Rated crit
CVE-2025-45788 CRITICAL POC
9.8 May 08

TOTOLINK A3100R V5.9c.1527 is vulnerable to Buffer Overflow via the comment parameter in setMacFilterRules. Rated critic
CVE-2025-45787 CRITICAL POC
9.8 May 08

TOTOLINK A3100R V5.9c.1527 is vulnerable to Buffer Overflow viathe comment parameter in setIpPortFilterRules. Rated crit
CVE-2024-42547 CRITICAL POC
9.8 Aug 12

TOTOLINK A3100R V4.1.2cu.5050_B20200504 has a buffer overflow vulnerability in the http_host parameter in the loginauth

CVE-2024-42546 CRITICAL POC
9.8 Aug 12

TOTOLINK A3100R V4.1.2cu.5050_B20200504 has a buffer overflow vulnerability in the password parameter in the loginauth f
CVE-2022-29645 CRITICAL POC
9.8 May 18

TOTOLINK A3100R V4.1.2cu.5050_B20200504 and V4.1.2cu.5247_B20211129 were discovered to contain a hard coded password for
CVE-2022-29644 CRITICAL POC
9.8 May 18

TOTOLINK A3100R V4.1.2cu.5050_B20200504 and V4.1.2cu.5247_B20211129 were discovered to contain a hard coded password for
CVE-2022-26214 CRITICAL POC
9.8 Mar 15

Totolink A830R V5.9c.4729_B20191112, A3100R V4.1.2cu.5050_B20200504, A950RG V4.1.2cu.5161_B20200903, A800R V4.1.2cu.5137

Same weakness CWE-306 – Missing Authentication for Critical Function

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CVE-2024-51567 CRITICAL POC
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CVE-2025-0108 HIGH POC
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CVE-2025-61757 CRITICAL POC
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CVE-2025-32433 CRITICAL POC
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Same technique Authentication Bypass

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CVE-2015-3306 CRITICAL POC
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CVE-2023-22515 CRITICAL POC
9.8
CVE-2012-4681 CRITICAL POC
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CVE-2013-2465 CRITICAL POC
9.8
CVE-2011-3544 CRITICAL POC
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CVE-2022-40684 CRITICAL POC
9.8
CVE-2025-61882 CRITICAL POC
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References

Advisories & patches
ADVISORY http://totolink.com ADVISORY https://vuldb.com/vuln/196173 REF http://a3100r.com

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