Executive Summary

Title pdns-recursor security update
Name DSA-4691 First vendor Publication 2020-05-21
Vendor Debian Last vendor Modification 2020-05-21
Severity (Vendor) N/A Revision 1

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Overall CVSS Score 7.5
Base Score 7.5 Environmental Score 7.5
impact SubScore 3.6 Temporal Score 7.5
Exploitabality Sub Score 3.9
Attack Vector Network Attack Complexity Low
Privileges Required None User Interaction None
Scope Unchanged Confidentiality Impact High
Integrity Impact None Availability Impact None
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:P/I:N/A:N)
Cvss Base Score 5 Attack Range Network
Cvss Impact Score 2.9 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores


Two vulnerabiliites have been discovered in PDNS Recursor, a resolving name server; a traffic amplification attack against third party authoritative name servers (NXNSAttack) and insufficient validation of NXDOMAIN responses lacking an SOA.

The version of pdns-recursor in the oldstable distribution (stretch) is no longer supported. If these security issues affect your setup, you should upgrade to the stable distribution (buster).

For the stable distribution (buster), these problems have been fixed in version 4.1.11-1+deb10u1.

We recommend that you upgrade your pdns-recursor packages.

For the detailed security status of pdns-recursor please refer to its security tracker page at: https://security-tracker.debian.org/tracker/pdns-recursor

Original Source

Url : http://www.debian.org/security/2020/dsa-4691

CWE : Common Weakness Enumeration

% Id Name
50 % CWE-400 Uncontrolled Resource Consumption ('Resource Exhaustion')
50 % CWE-347 Improper Verification of Cryptographic Signature

CPE : Common Platform Enumeration

Application 556
Application 1
Application 29
Os 1
Os 2
Os 1

Alert History

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Date Informations
2020-05-23 13:03:43
  • Multiple Updates
2020-05-22 00:17:42
  • First insertion