THREATPORT/VULNERABILITY/CVE-2020-25829
HIGH SEVERITY

CVE-2020-25829

Recursor vulnerability

CVSS
7.5
EPSS
6.5%
EPSS pct
93th
Exploited
No known
An issue has been found in PowerDNS Recursor before 4.1.18, 4.2.x before 4.2.5, and 4.3.x before 4.3.5. A remote attacker can cause the cached records for a given name to be updated to the Bogus DNSSEC validation state, instead of their actual DNSSEC Secure state, via a DNS ANY query. This results in a denial of service for installation that always validate (dnssec=validate), and for clients requesting validation when on-demand validation is enabled (dnssec=process).
Affected vendor
Powerdns
Affected product
Recursor
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2020-10-16

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 6.5% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 93% of all scored CVEs.

Check your external exposure to CVE-2020-25829

  • Confirm whether Powerdns Recursor is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2020-25829.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2020-25829

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2020-25829 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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