CVE-2020-8620
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
02 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
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 3.90% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 90.2% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2020-08-21 20:50Z6 YR AGO
- Last updated
- 2024-09-17 01:40Z2 YR AGO
- Reserved
- 2020-02-05
- Assigning CNA
- isc
- Record state
- PUBLISHED
- Severity
- High (CVSS 7.5)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- Data version
- 5.1
- Document digest
- 1d1ebcbd79803257880df34b50f2951bf1b31122ff2d58f0a6efcc0bb2d2f7e2
05 Affected products
06 References
- kb.isc.orghttps://kb.isc.org/docs/cve-2020-8620
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20200827-0003/
- usn.ubuntu.comUSN-4468-1https://usn.ubuntu.com/4468-1/
- security.gentoo.orgGLSA-202008-19https://security.gentoo.org/glsa/202008-19
- www.synology.comhttps://www.synology.com/security/advisory/Synology_SA_20_19
- lists.opensuse.orgopenSUSE-SU-2020:1699http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html
- lists.opensuse.orgopenSUSE-SU-2020:1701http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html
07 Remediation
Upgrade to the patched release most closely related to your current version of BIND: BIND 9.16.6 BIND 9.17.4
08 Fixed in
Debian 12
- bind9 Fixed in 1:9.16.6-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- bind9 Fixed in 1:9.16.6-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- bind9 Fixed in 1:9.16.6-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- bind9 Fixed in 1:9.16.1-0ubuntu2.3
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.