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Vulnerability record · CVE-2020-8622 · published 21 August 2020

CVE-2020-8622: Isc bind vulnerability

Isc · Bind

In BIND 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker on the network path for a TSIG-signed request, or operating the server receiving the TSIG-signed request, could send a truncated response to that request, triggering an assertion failure, causing the server to exit. Alternately, an off-path attacker would have to correctly guess when a TSIG-signed request was sent, along with other characteristics of the packet and message, and spoof a truncated response to trigger an assertion failure, causing the server to exit.

6.5 CVSS 3.1 Medium EPSS 5.6% · top 7.4% CWE-617 · CWE-617
6.5CVSS 3.1 base score, v2 4.0
5.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
8Affected product versions listed by NVD
26References
17 Jun 2026Last modified by NVD

Description

In BIND 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker on the network path for a TSIG-signed request, or operating the server receiving the TSIG-signed request, could send a truncated response to that request, triggering an assertion failure, causing the server to exit. Alternately, an off-path attacker would have to correctly guess when a TSIG-signed request was sent, along with other characteristics of the packet and message, and spoof a truncated response to trigger an assertion failure, causing the server to exit.

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

Affected products

8 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html Mailing ListThird Party Advisory
https://kb.isc.org/docs/cve-2020-8622 Vendor Advisory
https://lists.debian.org/debian-lts-announce/2020/08/msg00053.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DQN62GBMCIC5AY4KYADGXNK
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZKAMJZXR66P6S5LEU4SN7US
https://security.gentoo.org/glsa/202008-19 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200827-0003/ Third Party Advisory
https://usn.ubuntu.com/4468-1/ Third Party Advisory
https://usn.ubuntu.com/4468-2/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4752 Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html PatchThird Party Advisory
https://www.synology.com/security/advisory/Synology_SA_20_19 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html Mailing ListThird Party Advisory
https://kb.isc.org/docs/cve-2020-8622 Vendor Advisory
https://lists.debian.org/debian-lts-announce/2020/08/msg00053.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DQN62GBMCIC5AY4KYADGXNK
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZKAMJZXR66P6S5LEU4SN7US
https://security.gentoo.org/glsa/202008-19 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200827-0003/ Third Party Advisory
https://usn.ubuntu.com/4468-1/ Third Party Advisory
https://usn.ubuntu.com/4468-2/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4752 Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html PatchThird Party Advisory
https://www.synology.com/security/advisory/Synology_SA_20_19 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-8622), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.