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CVE-2020-8622

24
FAUCET Score

CVE-2020-8622 describes an assertion failure vulnerability in multiple versions of ISC BIND 9, including supported preview editions, affecting various vendors like Canonical, Debian, and Oracle. An attacker on the network path or operating the receiving server can send a truncated TSIG-signed response, causing the BIND server to crash. This vulnerability has a CVSS score of 6.5 (Medium), indicating a network-based attack with low complexity and no user interaction required, leading to high availability impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage regarding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 9.0.0, <= 9.11.21CPE matchmatch criteria
cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*
>= 9.12.0, <= 9.16.5CPE matchmatch criteria
cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*
>= 9.17.0, <= 9.17.3CPE matchmatch criteria
cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*
9.9.3CPE matchmatch criteria
cpe:2.3:a:isc:bind:9.9.3:s1:*:*:supported_preview:*:*:*
9.11.21CPE matchmatch criteria
cpe:2.3:a:isc:bind:9.11.21:s1:*:*:supported_preview:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
5.54%
Probability of exploitation in next 30 days
EPSS Percentile
92.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0554 is in the 98th percentile among its peer group of 21,951 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (8)

microsoftpatch availablevia msrc
Product: cm1 bind 9.16.3-2 on CBL Mariner 1.0Fixed in: 9.16.3-2
microsoftpatch availablevia msrc
Product: 19172-16820Fixed in: 9.16.3-2
oraclepatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: bind-32:9.11.4-26.P2.el7_9.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.6 Extended Update SupportFixed in: bind-32:9.9.4-74.el7_6.5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.7 Extended Update SupportFixed in: bind-32:9.11.4-9.P2.el7_7.3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: bind-32:9.11.20-5.el8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: bind-32:9.8.2-0.68.rc1.el6_10.8
View patch

Vendor Advisories (2)

redhatCVE-2020-8622Moderate

bind: truncated TSIG response can lead to an assertion failure

Aug 20, 2020
microsoft2020-Aug/CVE-2020-8622Moderate

A truncated TSIG response can lead to an assertion failure

Aug 11, 2020

References

lists.opensuse.org / opensuse-security-announce/2020-10/msg00041.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2020-10/msg00044.html
Mailing ListThird Party Advisory
kb.isc.org / docs/cve-2020-8622
Vendor Advisory
lists.debian.org / debian-lts-announce/2020/08/msg00053.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/DQN62GBMCIC5AY4KYADGXNKVY6AJKSJE
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/ZKAMJZXR66P6S5LEU4SN7USSNCWTXEXP
security.gentoo.org / glsa/202008-19
Third Party Advisory
security.netapp.com / advisory/ntap-20200827-0003
Third Party Advisory
usn.ubuntu.com / 4468-1
Third Party Advisory
usn.ubuntu.com / 4468-2
Third Party Advisory
debian.org / security/2020/dsa-4752
Third Party Advisory
oracle.com / security-alerts/cpuoct2021.html
PatchThird Party Advisory
synology.com / security/advisory/Synology_SA_20_19
Third Party Advisory