CVE-2020-8618: A buffer boundary check assertion in rdataset.c can fail incorrectly during zone transfer
Vulnerability summary
CVE-2020-8618 is a medium (CVSS 4.9) Reachable Assertion vulnerability in canonical ubuntu_linux. EPSS estimates a 1.88% chance of exploitation in the next 30 days, higher than 79.5% of scored vulnerabilities.
Not severe (CVSS 4.9, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 5 · Related 7Timeline
- 17-06-2020PublishedVulnerability first disclosed.
- 16-09-2024Last modifiedVulnerability information updated.
Description
An attacker who is permitted to send zone data to a server via zone transfer can exploit this to intentionally trigger the assertion failure with a specially constructed zone, denying service to clients.
CVSS metrics
8 scores · 7 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated4.9MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated4.9MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated4.9MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- OSV · WolfiEcosystem advisory · calculated4.9MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- OSV · ChainguardEcosystem advisory · calculated4.9MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
- NVDNIST4.9MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
1.88%
Chance of exploitation in the next 30 days
Percentile
80%
Versus all other CVEs
30-day change
Increase +0.04 pp
From 1.85% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Alpine1 product
- bind≥ 9.16.0, < 9.16.4-r0
Canonical1 product
- ubuntu_linuxEOL20.04
Chainguard1 product
- bindAll versions (No fix recorded)
Debian1 product
- bind9< 1:9.16.4-1
Netapp1 product
Opensuse1 product
- leapEOL15.1 | 15.2
Ubuntu1 product
- bind9< 1:9.16.1-0ubuntu2.2
Wolfi1 product
- bindAll versions (No fix recorded)
9 vendors · 10 products
References
11 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
