Improper Input Validation Affecting pdns-recursor package, versions <4.0.0~alpha2-2ubuntu0.1+esm1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU1604-PDNSRECURSOR-1191364
- published1 Jun 2025
- disclosed9 Nov 2018
Introduced: 9 Nov 2018
CVE-2018-14644 (opens in a new tab)How to fix?
Upgrade Ubuntu:16.04 pdns-recursor to version 4.0.0~alpha2-2ubuntu0.1+esm1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream pdns-recursor package and not the pdns-recursor package as distributed by Ubuntu.
See How to fix? for Ubuntu:16.04 relevant fixed versions and status.
An issue has been found in PowerDNS Recursor from 4.0.0 up to and including 4.1.4. A remote attacker sending a DNS query for a meta-type like OPT can lead to a zone being wrongly cached as failing DNSSEC validation. It only arises if the parent zone is signed, and all the authoritative servers for that parent zone answer with FORMERR to a query for at least one of the meta-types. As a result, subsequent queries from clients requesting DNSSEC validation will be answered with a ServFail.