CVE-2020-8620
Status: ModifiedHigh (7.5)—
In BIND 9.15.6 -> 9.16.5, 9.17.0 -> 9.17.3, An attacker who can establish a TCP connection with the server and send data on that connection can exploit this to trigger the assertion failure, causing the server to exit.
CVSS
- Version: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Base score: 7.5
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 3.69%
- Percentile among all scored CVEs: 89
- 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 (4)
CWEs
- CWE-617
References
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html
- https://kb.isc.org/docs/cve-2020-8620
- https://security.gentoo.org/glsa/202008-19
- https://security.netapp.com/advisory/ntap-20200827-0003/
- https://usn.ubuntu.com/4468-1/
- https://www.synology.com/security/advisory/Synology_SA_20_19
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html
- https://kb.isc.org/docs/cve-2020-8620
- https://security.gentoo.org/glsa/202008-19
- https://security.netapp.com/advisory/ntap-20200827-0003/
- https://usn.ubuntu.com/4468-1/
- https://www.synology.com/security/advisory/Synology_SA_20_19
Raw JSON (NVD)
Show
{
"id": "CVE-2020-8620",
"cveTags": [],
"metrics": {
"cvssMetricV2": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"version": "2.0",
"baseScore": 5,
"accessVector": "NETWORK",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
"authentication": "NONE",
"integrityImpact": "NONE",
"accessComplexity": "LOW",
"availabilityImpact": "PARTIAL",
"confidentialityImpact": "NONE"
},
"acInsufInfo": false,
"impactScore": 2.9,
"baseSeverity": "MEDIUM",
"obtainAllPrivilege": false,
"exploitabilityScore": 10,
"obtainUserPrivilege": false,
"obtainOtherPrivilege": false,
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"type": "Secondary",
"source": "security-officer@isc.org",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.5,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "NONE"
},
"impactScore": 3.6,
"exploitabilityScore": 3.9
},
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.5,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "NONE"
},
"impactScore": 3.6,
"exploitabilityScore": 3.9
}
]
},
"affected": [
{
"source": "security-officer@isc.org",
"affectedData": [
{
"vendor": "ISC",
"product": "BIND9",
"versions": [
{
"status": "affected",
"changes": [
{
"at": "9.16.6",
"status": "unaffected"
},
{
"at": "9.17.0",
"status": "affected"
},
{
"at": "9.17.4",
"status": "unaffected"
}
],
"version": "9.15.6",
"lessThan": "*",
"versionType": "custom"
}
]
}
]
}
],
"published": "2020-08-21T21:15:12.090",
"references": [
{
"url": "http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html",
"tags": [
"Third Party Advisory"
],
"source": "security-officer@isc.org"
},
{
"url": "http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html",
"tags": [
"Third Party Advisory"
],
"source": "security-officer@isc.org"
},
{
"url": "https://kb.isc.org/docs/cve-2020-8620",
"tags": [
"Vendor Advisory"
],
"source": "security-officer@isc.org"
},
{
"url": "https://security.gentoo.org/glsa/202008-19",
"tags": [
"Third Party Advisory"
],
"source": "security-officer@isc.org"
},
{
"url": "https://security.netapp.com/advisory/ntap-20200827-0003/",
"tags": [
"Third Party Advisory"
],
"source": "security-officer@isc.org"
},
{
"url": "https://usn.ubuntu.com/4468-1/",
"tags": [
"Third Party Advisory"
],
"source": "security-officer@isc.org"
},
{
"url": "https://www.synology.com/security/advisory/Synology_SA_20_19",
"tags": [
"Third Party Advisory"
],
"source": "security-officer@isc.org"
},
{
"url": "http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html",
"tags": [
"Third Party Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html",
"tags": [
"Third Party Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://kb.isc.org/docs/cve-2020-8620",
"tags": [
"Vendor Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://security.gentoo.org/glsa/202008-19",
"tags": [
"Third Party Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://security.netapp.com/advisory/ntap-20200827-0003/",
"tags": [
"Third Party Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://usn.ubuntu.com/4468-1/",
"tags": [
"Third Party Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://www.synology.com/security/advisory/Synology_SA_20_19",
"tags": [
"Third Party Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-617"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In BIND 9.15.6 -> 9.16.5, 9.17.0 -> 9.17.3, An attacker who can establish a TCP connection with the server and send data on that connection can exploit this to trigger the assertion failure, causing the server to exit."
},
{
"lang": "es",
"value": "En BIND versiones 9.15.6 -) 9.16.5, 9.17.0 -) 9.17.3, un atacante que puede establecer una conexión TCP con el servidor y enviar datos en esa conexión puede explotar esto para desencadenar el fallo de aserción, causando la salida del servidor."
}
],
"lastModified": "2026-06-17T03:26:39.610",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "24524CED-1757-4EEF-BAB3-008558FB4C1E",
"versionEndIncluding": "9.16.5",
"versionStartIncluding": "9.15.6"
},
{
"criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "85031A21-4F54-4CE6-B0F3-66D09928FF3C",
"versionEndIncluding": "9.17.3",
"versionStartIncluding": "9.17.0"
}
],
"operator": "OR"
}
]
},
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:isc:bind:9.9.12:s1:*:*:supported_preview:*:*:*",
"vulnerable": true,
"matchCriteriaId": "DAF8FA8C-0526-4389-AEC6-92AD62AA3929"
},
{
"criteria": "cpe:2.3:a:isc:bind:9.9.13:s1:*:*:supported_preview:*:*:*",
"vulnerable": true,
"matchCriteriaId": "1A9BA952-A5DF-4CBA-8928-0B373C013C32"
},
{
"criteria": "cpe:2.3:a:isc:bind:9.11.3:s1:*:*:supported_preview:*:*:*",
"vulnerable": true,
"matchCriteriaId": "C2FE13E1-0646-46FC-875B-CB4C34E20101"
},
{
"criteria": "cpe:2.3:a:isc:bind:9.11.21:s1:*:*:supported_preview:*:*:*",
"vulnerable": true,
"matchCriteriaId": "5CC1F26C-4757-4C87-BD8B-2FA456A88C6F"
}
],
"operator": "OR"
}
]
},
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "B620311B-34A3-48A6-82DF-6F078D7A4493"
},
{
"criteria": "cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "B009C22E-30A4-4288-BCF6-C3E81DEAF45A"
}
],
"operator": "OR"
}
]
},
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:netapp:steelstore_cloud_integrated_storage:-:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "E94F7F59-1785-493F-91A7-5F5EA5E87E4D"
}
],
"operator": "OR"
}
]
},
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*",
"vulnerable": true,
"matchCriteriaId": "B6B7CAD7-9D4E-4FDB-88E3-1E583210A01F"
},
{
"criteria": "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*",
"vulnerable": true,
"matchCriteriaId": "7A5301BF-1402-4BE0-A0F8-69FBE79BC6D6"
},
{
"criteria": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
"vulnerable": true,
"matchCriteriaId": "23A7C53F-B80F-4E6A-AFA9-58EEA84BE11D"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "security-officer@isc.org"
}