CVE-2020-8620

7.5 HIGH 4% exploit odds Fix listed

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of service disruption.
Exploit odds: 3.9% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2020-08-21 21:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:26 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 3.9% in the next 30 days (EPSS).
Severity: 7.5 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2020-08-21 21:15 UTC
Last modified: 2026-06-17 03:26 UTC
Exploit probability: 3.9% · EPSS, next 30 days
Weakness: CWE-617
Record status: Modified

Affected

Isc Bind ≤ 9.16.5
Isc Bind ≤ 9.17.3
Isc Bind 9.9.12
Isc Bind 9.9.13
Isc Bind 9.11.3
Isc Bind 9.11.21
Opensuse Leap 15.1
Opensuse Leap 15.2

Attack profile CVSS 3.1 · 7.5

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Raw vector

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

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record