HIGH
CVE-2020-8620
CWE-617Published: August 21, 2020· Updated: Jun 17, 2026
7.5
CVSS v3.1
Official Description
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.
Technical Analysis
CVE-2020-8620 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
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
ADVISORYhttps://usn.ubuntu.com/4468-1/
ADVISORYhttps://usn.ubuntu.com/4468-1/
All References (14)
→
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.htmlThird Party Advisory
→
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.htmlThird Party Advisory
→
https://kb.isc.org/docs/cve-2020-8620Vendor 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.htmlThird Party Advisory
→
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.htmlThird Party Advisory
→
https://kb.isc.org/docs/cve-2020-8620Vendor 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-2020-8620
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-617
CISA KEVNo
Affected4 vendor(s)
PublishedAug 21, 2020
Related CVEs (CWE-617)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2020-8620 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.