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CVE Record

CVE-2020-8618: A buffer boundary check assertion in rdataset.c can fail incorrectly during zone transfer

An attacker who is permitted to send zone data to a server via zone transfer can exploit this to intentionally trigger the assertion failure with a specially constructed zone, denying service to clients.

MediumCVSS 4.9Not KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

CVE-2020-8618 is a denial-of-service flaw in ISC BIND9. A trusted party able to send zone-transfer data can cause an assertion failure using specially crafted zone data, interrupting DNS service for clients. Exposure is most likely on DNS servers running ISC BIND9 versions 9.16.0 through 9.16.3 that accept inbound zone-transfer data from partners, primaries, or other trusted sources. Treat as a moderate DNS availability risk. Prioritize remediation on internet-facing or business-critical DNS infrastructure, especially where third parties or multiple internal teams can provide zone-transfer data. Mitigation focus: Inventory BIND9 servers and identify versions 9.16.0 through 9.16.3.; Check ISC and operating-system vendor advisories for fixed packages.; Upgrade or patch affected BIND9 installations using vendor guidance..

Prepared

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2020-8618 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
4.9 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
4.9CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H1.23.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

4.9Medium
CVSS 3.1 vector shape for CVE-2020-8618Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
ISCBIND99.16.0 -> 9.16.3Listed
Weakness

CWE details

No CWE listed

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