CVE-2020-10030

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 23.9%, top 2% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 24%CVSS: 8.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

An issue has been found in PowerDNS Recursor 4.1.0 up to and including 4.3.0. It allows an attacker (with enough privileges to change the system's hostname) to cause disclosure of uninitialized memory content via a stack-based out-of-bounds read. It only occurs on systems where gethostname() does not have '\0' termination of the returned string if the hostname is larger than the supplied buffer. (Linux systems are not affected because the buffer is always large enough. OpenBSD systems are not affected because the returned hostname always has '\0' termination.) Under some conditions, this issue can lead to the writing of one '\0' byte out-of-bounds on the stack, causing a denial of service or possibly arbitrary code execution.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
24%
EPSS %ILE
98%
KEV
Not listed

Published

May 19, 2020

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Aug 11, 2026
No patch confirmed yet.
generic

[SECURITY] Fedora 32 Update: pdns-recursor-4.3.1-1.fc32 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PS4ZN5XGENYNFKX7QIIOUCQQHXE37GJF/
generic

[SECURITY] Fedora 31 Update: pdns-recursor-4.2.2-1.fc31 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NMP72NJGKBWR5WEBXAWX5KSLQUDFTG6S/
generic

PowerDNS Security Advisory 2020-03: Information disclosure - PowerDNS Recursor documentation

https://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-03.html

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
pdns-recursor—4.3.1-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
pdns-recursor—4.3.1-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
pdns-recursor—4.3.1-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
pdns-recursor—4.3.1-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 28× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 119 total refreshes for this CVE.

  1. 2026-08-20 22:51 UTCEPSS rescore
  2. 2026-08-20 21:31 UTCOSV refresh
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  1. 2026-07-23 14:15 UTCEPSS rescore
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  8. 2026-07-19 12:24 UTCOSV refresh
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Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2020-10030?
CVE-2020-10030 is a high vulnerability published on May 19, 2020. An issue has been found in PowerDNS Recursor 4.1.0 up to and including 4.3.0. It allows an attacker (with enough privileges to change the system's hostname) to cause disclosure of uninitialized memory content via a stack-based out-of-bounds read. It only occurs on systems where gethostname() does…
When was CVE-2020-10030 disclosed?
CVE-2020-10030 was first published in the National Vulnerability Database on May 19, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-10030 actively exploited?
CVE-2020-10030 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24% probability of exploitation in the next 30 days, which ranks it in the top 2.3% of all scored CVEs.
What is the CVSS score of CVE-2020-10030?
CVE-2020-10030 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2020-10030?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-10030, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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