CVE-2020-8623: canonical ubuntu_linux Reachable Assertion
Vulnerability summary
CVE-2020-8623 is a high (CVSS 7.5) Reachable Assertion vulnerability in canonical ubuntu_linux. EPSS estimates a 6.40% chance of exploitation in the next 30 days, higher than 93.5% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 12 · Related 8Timeline
- 21-08-2020PublishedVulnerability first disclosed.
- 17-09-2024Last modifiedVulnerability information updated.
Description
In BIND 9.10.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.10.5-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker that can reach a vulnerable system with a specially crafted query packet can trigger a crash. To be vulnerable, the system must: * be running BIND that was built with "--enable-native-pkcs11" * be signing one or more zones with an RSA key * be able to receive queries from a possible attacker
CVSS metrics
8 scores · 7 sources · 2 versions- 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
EPSS trend
Probability
6.40%
Chance of exploitation in the next 30 days
Percentile
94%
Versus all other CVEs
30-day change
0.00 pp
From 6.40% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian2 products
- bind9< 1:9.16.6-1
- debian_linuxEOL9.0 | 10.0
Isc2 products
Alpine1 product
- bind≥ 9.10.0, < 9.16.6-r0
Canonical1 product
- ubuntu_linuxEOL16.04 | 18.04 | 20.04
Chainguard1 product
- bindAll versions (No fix recorded)
Fedoraproject1 product
- fedoraEOL31 | 32
Netapp1 product
Opensuse1 product
- leapEOL15.1 | 15.2
Synology1 product
- dns_server< 2.2.2-5027
Ubuntu1 product
- bind9< 1:9.10.3.dfsg.P4-8ubuntu1.17 | < 1:9.11.3+dfsg-1ubuntu1.13 | < 1:9.16.1-0ubuntu2.3
Wolfi1 product
- bindAll versions (No fix recorded)
11 vendors · 13 products
References
17 links
- lists.debian.org/debian-lts-announce/2020/08/msg00053.htmlMailing ListX Refsource MLISTAdvisoryThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.htmlVendor AdvisoryX Refsource SUSEAdvisoryMailing ListThird Party Advisory
Show all 17 references
- lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.htmlVendor AdvisoryX Refsource SUSEAdvisoryMailing ListThird Party Advisory
