CVE-2020-10995: debian debian_linux Uncontrolled Resource Consumption
Vulnerability summary
CVE-2020-10995 is a high (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in debian debian_linux. EPSS estimates a 4.48% chance of exploitation in the next 30 days, higher than 91.3% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 4 · Related 2Timeline
- 19-05-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
PowerDNS Recursor from 4.1.0 up to and including 4.3.0 does not sufficiently defend against amplification attacks. An issue in the DNS protocol has been found that allow malicious parties to use recursive DNS services to attack third party authoritative name servers. The attack uses a crafted reply by an authoritative name server to amplify the resulting traffic between the recursive and other authoritative name servers. Both types of service can suffer degraded performance as an effect. This is triggered by random subdomains in the NSDNAME in NS records. PowerDNS Recursor 4.1.16, 4.2.2 and 4.3.1 contain a mitigation to limit the impact of this DNS protocol issue.
CVSS metrics
4 scores · 3 sources · 2 versions- 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
EPSS trend
Probability
4.48%
Chance of exploitation in the next 30 days
Percentile
91%
Versus all other CVEs
30-day change
+0.11 pp
From 4.37% on 20-09-2026
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
- pdns-recursor< 4.3.1-1
- debian_linuxEOL10.0
Opensuse2 products
- backports_sle15.0:sp1
- leapEOL15.1
Fedoraproject1 product
- fedoraEOL31 | 32
Powerdns1 product
- recursor≥ 4.1.0, ≤ 4.3.0
Ubuntu1 product
- pdns-recursorAll versions (No fix recorded)
5 vendors · 7 products
References
10 links- doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-01.htmlX Refsource CONFIRMVendor Advisory
- lists.opensuse.org/opensuse-security-announce/2020-05/msg00052.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory