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CVE Record

CVE-2019-13207: nsd-checkzone in NLnet Labs NSD 4.2.0 has a Stack-based Buffer Overflow in the dname_concatenate() function...

nsd-checkzone in NLnet Labs NSD 4.2.0 has a Stack-based Buffer Overflow in the dname_concatenate() function in dname.c.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2019-13207 is a stack-based buffer overflow in the nsd-checkzone utility shipped with NLnet Labs NSD 4.2.0. The source bundle does not provide a CVSS score, confirmed impact, or active exploitation evidence. Treat it as an exposure review item for systems validating DNS zone files, especially when those files may come from outside trusted administrators.

Executive priority

Prioritize discovery and patch verification, not emergency response, unless your environment processes externally supplied zone files. The absence of KEV status and scoring lowers certainty, but a memory corruption issue in DNS administration tooling is still worth closing during normal vulnerability remediation cycles.

Technical view

The issue is reported in dname_concatenate() in dname.c, reachable through nsd-checkzone in NSD 4.2.0. The bundle identifies a stack-based buffer overflow but does not include exploitability analysis, affected CPEs, or a vendor fix detail beyond a Fedora advisory reference. Scope appears tied to zone-file validation, not necessarily network-facing DNS service behavior.

Likely exposure

Likely exposure is limited to systems with NLnet Labs NSD 4.2.0 where nsd-checkzone is installed or used to validate DNS zone files. Risk increases if zone files are supplied by customers, partners, CI pipelines, or other less-trusted sources. The bundle does not prove broader NSD daemon exposure.

Exploitation context

The CVE is not listed as KEV in the provided bundle, and no cited source states active exploitation. The vulnerability class can be serious, but the available evidence does not establish exploit maturity, attack prerequisites, or real-world abuse.

Researcher notes

Evidence is sparse. The bundle names nsd-checkzone, NSD 4.2.0, dname_concatenate(), and dname.c, with references to a GitHub issue and Fedora advisory. It does not provide CVSS, CWE metadata, fixed versions, proof of active exploitation, or detailed affected-platform data.

Mitigation direction

  • Check NLnet Labs and distribution guidance for the affected NSD release.
  • Apply Fedora or vendor package updates where NSD 4.2.0 is present.
  • Avoid processing untrusted zone files with nsd-checkzone until remediated.
  • Run zone validation with least privilege and operational isolation.
  • Document any remaining NSD 4.2.0 systems as accepted risk.

Validation and detection

  • Inventory systems with NLnet Labs NSD installed.
  • Confirm whether version 4.2.0 is present.
  • Identify workflows invoking nsd-checkzone.
  • Review whether zone files come from untrusted or semi-trusted sources.
  • Verify vendor or distribution advisory updates are applied.
  • Check operational logs for nsd-checkzone crashes or abnormal exits.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2019-13207 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.