CVE-2021-45503
Status: ModifiedHigh (8.8)—
Certain NETGEAR devices are affected by authentication bypass. This affects CBR750 before 4.6.3.6, RBK752 before 3.2.17.12, RBR750 before 3.2.17.12, RBS750 before 3.2.17.12, RBK852 before 3.2.17.12, RBR850 before 3.2.17.12, and RBS850 before 3.2.17.12.
CVSS
- Version: 3.1
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Base score: 8.8
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 0.46%
- Percentile among all scored CVEs: 38
- Score date: 10/6/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (7)
CWEs
- NVD-CWE-noinfo
References
Raw JSON (NVD)
Show
{
"id": "CVE-2021-45503",
"cveTags": [],
"metrics": {
"cvssMetricV2": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"version": "2.0",
"baseScore": 5.8,
"accessVector": "ADJACENT_NETWORK",
"vectorString": "AV:A/AC:L/Au:N/C:P/I:P/A:P",
"authentication": "NONE",
"integrityImpact": "PARTIAL",
"accessComplexity": "LOW",
"availabilityImpact": "PARTIAL",
"confidentialityImpact": "PARTIAL"
},
"acInsufInfo": false,
"impactScore": 6.4,
"baseSeverity": "MEDIUM",
"obtainAllPrivilege": false,
"exploitabilityScore": 6.5,
"obtainUserPrivilege": false,
"obtainOtherPrivilege": false,
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"type": "Secondary",
"source": "cve@mitre.org",
"cvssData": {
"scope": "CHANGED",
"version": "3.1",
"baseScore": 9.6,
"attackVector": "ADJACENT_NETWORK",
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "HIGH"
},
"impactScore": 6,
"exploitabilityScore": 2.8
},
{
"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": "2021-12-26T01:15:13.033",
"references": [
{
"url": "https://kb.netgear.com/000064127/Security-Advisory-for-Authentication-Bypass-on-Some-WiFi-Systems-PSV-2020-0474",
"tags": [
"Vendor Advisory"
],
"source": "cve@mitre.org"
},
{
"url": "https://kb.netgear.com/000064127/Security-Advisory-for-Authentication-Bypass-on-Some-WiFi-Systems-PSV-2020-0474",
"tags": [
"Vendor Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Certain NETGEAR devices are affected by authentication bypass. This affects CBR750 before 4.6.3.6, RBK752 before 3.2.17.12, RBR750 before 3.2.17.12, RBS750 before 3.2.17.12, RBK852 before 3.2.17.12, RBR850 before 3.2.17.12, and RBS850 before 3.2.17.12."
},
{
"lang": "es",
"value": "Determinados dispositivos NETGEAR están afectados por una omisión de autenticación. Esto afecta a CBR750 versiones anteriores a 4.6.3.6, RBK752 versiones anteriores a 3.2.17.12, RBR750 versiones anteriores a 3.2.17.12, RBS750 versiones anteriores a 3.2.17.12, RBK852 versiones anteriores a 3.2.17.12, RBR850 versiones anteriores a 3.2.17.12 y RBS850 versiones anteriores a 3.2.17.12"
}
],
"lastModified": "2026-06-17T04:13:31.480",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:netgear:cbr750_firmware:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "A87D3ACB-B5A3-4F1F-BF46-73C0AD690D8C",
"versionEndExcluding": "4.6.3.6"
}
],
"operator": "OR"
},
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:h:netgear:cbr750:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "CBD14EFC-C6EF-485B-A594-73B8525704A5"
}
],
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:netgear:rbk752_firmware:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "D8D90FF3-F5CE-43DF-ACF7-C64DBDCCA185",
"versionEndExcluding": "3.2.17.12"
}
],
"operator": "OR"
},
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:h:netgear:rbk752:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "A45832BD-114D-42F1-B9F1-7532496D30A6"
}
],
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:netgear:rbr750_firmware:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "B6AE1767-9D9A-4E9E-B088-6727FACFDE5C",
"versionEndExcluding": "3.2.17.12"
}
],
"operator": "OR"
},
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:h:netgear:rbr750:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "C13F5C69-FA9B-472A-9036-0C2967BDCDE9"
}
],
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:netgear:rbs750_firmware:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "F614A1AB-F0C0-45D7-8D91-ECA3C1AA9165",
"versionEndExcluding": "3.2.17.12"
}
],
"operator": "OR"
},
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:h:netgear:rbs750:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "B529194C-C440-4BC3-850F-0613FC548F86"
}
],
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:netgear:rbk852_firmware:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "845C1FCC-F54B-452A-B121-1CD1A7867027",
"versionEndExcluding": "3.2.17.12"
}
],
"operator": "OR"
},
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:h:netgear:rbk852:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "14F257FE-31CE-4F74-829D-29407D74ADF7"
}
],
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:netgear:rbr850_firmware:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "01E0EF50-145F-407A-8915-4EFFCD833505",
"versionEndExcluding": "3.2.17.12"
}
],
"operator": "OR"
},
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:h:netgear:rbr850:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "D92E4C8E-222A-476C-8273-F7171FC61F0B"
}
],
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:netgear:rbs850_firmware:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "0DC5A075-0619-409C-B057-41015B8C54B3",
"versionEndExcluding": "3.2.17.12"
}
],
"operator": "OR"
},
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:h:netgear:rbs850:-:*:*:*:*:*:*:*",
"vulnerable": false,
"matchCriteriaId": "221CA950-E984-44CD-9E1B-3AADE3CEBE52"
}
],
"operator": "OR"
}
],
"operator": "AND"
}
],
"sourceIdentifier": "cve@mitre.org"
}