CVE-2020-8621: canonical ubuntu_linux Reachable Assertion
CVSS: 7.5v3.1HighModified
AliasesALPINE-CVE-2020-8621UBUNTU-CVE-2020-8621DEBIAN-CVE-2020-8621CGA-288p-7r38-cpmgCGA-pjp8-3w24-wjrc
Published 21-08-2020Last modified 16-09-2024
Vulnerability summary
CVE-2020-8621 is a high (CVSS 7.5) Reachable Assertion vulnerability in canonical ubuntu_linux. EPSS estimates a 2.97% chance of exploitation in the next 30 days, higher than 87% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (CVE.org)EPSS score
2.97%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 5 · Related 7Timeline
- 21-08-2020PublishedVulnerability first disclosed.
- 16-09-2024Last modifiedVulnerability information updated.
Description
In BIND 9.14.0 -> 9.16.5, 9.17.0 -> 9.17.3, If a server is configured with both QNAME minimization and 'forward first' then an attacker who can send queries to it may be able to trigger the condition that will cause the server to crash. Servers that 'forward only' are not affected.
CVSS metrics
8 scores · 7 sources · 2 versionsHigh 7.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 7 agree
- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · WolfiEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · ChainguardEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Medium 4.3Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
2.97%
Chance of exploitation in the next 30 days
Percentile
87%
Versus all other CVEs
30-day change
0.00 pp
From 2.97% on 18-09-2026
18-09-202618-10-2026
EPSS score2.97%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Alpine1 product
- bind≥ 9.14.0, < 9.16.6-r0
Canonical1 product
- ubuntu_linuxEOL16.04 | 18.04 | 20.04
Chainguard1 product
- bindAll versions (No fix recorded)
Debian1 product
- bind9< 1:9.16.6-1
Netapp1 product
Opensuse1 product
- leapEOL15.1 | 15.2
Synology1 product
- dns_server< 2.2.2-5027
Ubuntu1 product
- bind9< 1:9.16.1-0ubuntu2.3
Wolfi1 product
- bindAll versions (No fix recorded)
10 vendors · 11 products
References
13 links- lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.htmlVendor AdvisoryX Refsource SUSEAdvisoryMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.htmlVendor AdvisoryX Refsource SUSEAdvisoryMailing ListThird Party Advisory
