HOME VULNERABILITIESCVE-2020-8621

HIGH

CVE-2020-8621

CWE-617Published: August 21, 2020· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official 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.

Technical Analysis

CVE-2020-8621 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

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

Affected Vendors & Products

Canonical1 product(s)

ubuntu linux

isc1 product(s)

bind

netapp1 product(s)

steelstore cloud integrated storage

openSUSE1 product(s)

leap

synology1 product(s)

dns server

Source: NVD CPE · 8 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html

ADVISORYhttps://kb.isc.org/docs/cve-2020-8621

ADVISORYhttps://security.gentoo.org/glsa/202008-19

ADVISORYhttps://security.netapp.com/advisory/ntap-20200827-0003/

ADVISORYhttps://usn.ubuntu.com/4468-1/

ADVISORYhttps://www.synology.com/security/advisory/Synology_SA_20_19

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html

ADVISORYhttps://kb.isc.org/docs/cve-2020-8621

ADVISORYhttps://security.gentoo.org/glsa/202008-19

ADVISORYhttps://security.netapp.com/advisory/ntap-20200827-0003/

ADVISORYhttps://usn.ubuntu.com/4468-1/

ADVISORYhttps://www.synology.com/security/advisory/Synology_SA_20_19

All References (14)

→

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.htmlMailing List · Third Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.htmlMailing List · Third Party Advisory

→

https://kb.isc.org/docs/cve-2020-8621Vendor Advisory

→

https://security.gentoo.org/glsa/202008-19Third Party Advisory

→

https://security.netapp.com/advisory/ntap-20200827-0003/Third Party Advisory

→

https://usn.ubuntu.com/4468-1/Third Party Advisory

→

https://www.synology.com/security/advisory/Synology_SA_20_19Third Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.htmlMailing List · Third Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.htmlMailing List · Third Party Advisory

→

https://kb.isc.org/docs/cve-2020-8621Vendor Advisory

→

https://security.gentoo.org/glsa/202008-19Third Party Advisory

→

https://security.netapp.com/advisory/ntap-20200827-0003/Third Party Advisory

→

https://usn.ubuntu.com/4468-1/Third Party Advisory

→

https://www.synology.com/security/advisory/Synology_SA_20_19Third Party Advisory

Quick Facts

CVE IDCVE-2020-8621

CVSS Score7.5 / 10

SeverityHIGH

WeaknessCWE-617

CISA KEVNo

Affected5 vendor(s)

PublishedAug 21, 2020

Related CVEs (CWE-617)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2020-8621 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.

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