Security readout for executives and security teams
Plain-English summary
CVE-2019-13951 is a stack-based buffer overflow in gdnsd 3.x before 3.2.1. It can be triggered by long, malformed IPv4 address data in DNS zone files. The main business concern is disruption or memory corruption if untrusted or automated zone data reaches gdnsd.
Executive priority
Treat this as a targeted hygiene issue for DNS infrastructure. Prioritize if gdnsd is internet-facing, business-critical, or fed by automated zone pipelines. No source provided evidence of active exploitation, so urgency depends on local exposure.
Technical view
The flaw is in set_ipv4() in zscan_rfc1035.rl, part of gdnsd zone data parsing. A malformed IPv4 address in zone data can overflow stack memory. Public data identifies gdnsd 3.x before 3.2.1, but no CVSS vector, CWE, or detailed exploit impact is provided.
Likely exposure
Exposure is most likely where gdnsd 3.x before 3.2.1 is deployed and loads zone data from external, delegated, automated, or otherwise weakly controlled sources.
Exploitation context
The CVE sources describe malformed zone data as the trigger. They do not show active exploitation, and CISA KEV status is false in the supplied bundle. The practical risk depends on who can influence zone files or zone-generation pipelines.
Researcher notes
The source bundle is sparse: no CVSS, CWE, CPE, exploit status, or detailed impact analysis. The strongest facts are the affected gdnsd version range, vulnerable function, parser file, and malformed IPv4 zone-data trigger.
Mitigation direction
- Upgrade gdnsd 3.x deployments to version 3.2.1 or later.
- Review the linked gdnsd issue and vendor release guidance.
- Restrict who can create or modify gdnsd zone data.
- Add review or validation for generated zone files before loading.
- Avoid accepting zone data from untrusted sources without controls.
Validation and detection
- Inventory systems running gdnsd and record exact versions.
- Identify any gdnsd deployments older than 3.2.1.
- Map how zone data is generated, imported, and approved.
- Confirm whether untrusted parties can influence zone content.
- Review operational logs for crashes during zone reloads or parsing.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2019-13951 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/gdnsd/gdnsd/issues/185CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.