CVE-2021-46008

In totolink a3100r V5.9c.4577, the hard-coded telnet password can be discovered from official released firmware. An attacker, who has connected to the Wi-Fi, can easily telnet into the target with root shell if the telnet is function turned on.

CVSS v3 8.8 HIGH
CVSS v2.0 7.9 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector ADJACENT_NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

7.9^/10

CVSS v2.0 : HIGH

Vector : AV:A/AC:M/Au:N/C:C/I:C/A:C

Exploitability : 5.5 / Impact : 10.0

Access Vector ADJACENT_NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact COMPLETE

Integrity Impact COMPLETE

Availability Impact COMPLETE

References

Link	Resource
https://hackmd.io/ZkeEB-VvRiWBS53rFKG8DQ	Exploit Third Party Advisory
https://hackmd.io/ZkeEB-VvRiWBS53rFKG8DQ	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

AND

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

cpe:2.3:h:totolink:a3100r:-:*:*:*:*:*:*:*

History

09 Jul 2026, 01:17

Type	Values Removed	Values Added
References	~~{'url': 'http://a3100r.com', 'tags': ['Broken Link'], 'source': 'af854a3a-2127-422b-91ae-364da2661108'}~~ ~~{'url': 'http://totolink.com', 'tags': ['Vendor Advisory'], 'source': 'af854a3a-2127-422b-91ae-364da2661108'}~~

21 Nov 2024, 06:33

Type	Values Removed	Values Added
References	~~() http://a3100r.com - Broken Link~~	() http://a3100r.com - Broken Link
References	~~() http://totolink.com - Vendor Advisory~~	() http://totolink.com - Vendor Advisory
References	~~() https://hackmd.io/ZkeEB-VvRiWBS53rFKG8DQ - Exploit, Third Party Advisory~~	() https://hackmd.io/ZkeEB-VvRiWBS53rFKG8DQ - Exploit, Third Party Advisory

Information

Published : 2022-03-30 23:15

Updated : 2026-07-09 01:17

NVD link : CVE-2021-46008

Mitre link : CVE-2021-46008

CVE.ORG link : CVE-2021-46008

JSON object : View

Products Affected

totolink

a3100r
a3100r_firmware

CWE

CWE-798

Use of Hard-coded Credentials

{"id": "CVE-2021-46008", "cveTags": [], "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 7.9, "accessVector": "ADJACENT_NETWORK", "vectorString": "AV:A/AC:M/Au:N/C:C/I:C/A:C", "authentication": "NONE", "integrityImpact": "COMPLETE", "accessComplexity": "MEDIUM", "availabilityImpact": "COMPLETE", "confidentialityImpact": "COMPLETE"}, "acInsufInfo": false, "impactScore": 10.0, "baseSeverity": "HIGH", "obtainAllPrivilege": false, "exploitabilityScore": 5.5, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}]}, "affected": [{"source": "cve@mitre.org", "affectedData": [{"vendor": "n/a", "product": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}]}], "published": "2022-03-30T23:15:07.863", "references": [{"url": "https://hackmd.io/ZkeEB-VvRiWBS53rFKG8DQ", "tags": ["Exploit", "Third Party Advisory"], "source": "cve@mitre.org"}, {"url": "https://hackmd.io/ZkeEB-VvRiWBS53rFKG8DQ", "tags": ["Exploit", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-798"}]}], "descriptions": [{"lang": "en", "value": "In totolink a3100r V5.9c.4577, the hard-coded telnet password can be discovered from official released firmware. An attacker, who has connected to the Wi-Fi, can easily telnet into the target with root shell if the telnet is function turned on."}, {"lang": "es", "value": "En totolink a3100r versi\u00f3n V5.9c.4577, la contrase\u00f1a de telnet embebida puede ser detectada desde el firmware oficial liberado. Un atacante, que ha sido conectado a Wi-Fi, puede f\u00e1cilmente telnet en el objetivo con la shell root si el telnet es la funci\u00f3n habilitada"}], "lastModified": "2026-07-09T01:17:12.527", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:totolink:a3100r_firmware:5.9c.4577:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "393F2623-291A-4E8B-80D6-D40193EE045A"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:h:totolink:a3100r:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "40729E79-9D89-440F-B38D-E62D310E27F9"}], "operator": "OR"}], "operator": "AND"}], "sourceIdentifier": "cve@mitre.org"}