Is CVE-2020-8621 in the CISA KEV catalog?

No. CVE-2020-8621 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-8621?

CVE-2020-8621 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2020-8621?

CVE-2020-8621 has an EPSS score of 2.94% (85th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-8621?

Upgrade bind9 on debian 11 to 1:9.16.6-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2020-8621

HIGHEPSS 85th pctl

7.5

CVSS v3

NVD

Description

In BIND 9.14.0 -> 9.16.5, 9.17.0 -> 9.17.3, If a server is configured with both QNAME minimization and 'forward first' then an attacker who can send queries to it may be able to trigger the condition that will cause the server to crash. Servers that 'forward only' are not affected.

CWE-617

How to fix

Remediation Available

bind9Debian

Fixed in:1:9.16.6-1CVE-2020-8621

bind9Ubuntu

Fixed in:1:9.10.3.dfsg.P4-8ubuntu1.17USN-4468-1

Fixed in:1:9.11.3+dfsg-1ubuntu1.13USN-4468-1

Fixed in:1:9.16.1-0ubuntu2.3USN-4468-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

2.94%probability of exploitation in 30 days

85thpercentile

Elevated risk: more likely to be exploited than 85% of all known CVEs.

References

Vendor Advisory1

kb.isc.org

Third-Party Advisory6

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.