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CVE Record

CVE-2019-25038: Unbound before 1.9.5 allows an integer overflow in a size calculation in dnscrypt/dnscrypt.c.

Unbound before 1.9.5 allows an integer overflow in a size calculation in dnscrypt/dnscrypt.c. NOTE: The vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running Unbound installation cannot be remotely or locally exploited

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

CVE-2019-25038 concerns an integer overflow in Unbound’s DNSCrypt code before version 1.9.5. The key business point is that the vendor disputes practical exploitability, stating a running installation cannot be exploited remotely or locally. Treat this as a patch hygiene issue, not an emergency, unless vendor guidance says otherwise.

Executive priority

Handle during normal vulnerability remediation cycles unless internal inventory shows old Unbound packages in critical systems. The available evidence does not support emergency response or incident assumptions.

Technical view

The reported flaw is an integer overflow in a size calculation in dnscrypt/dnscrypt.c in Unbound before 1.9.5. Public source data does not provide CVSS, CWE, confirmed affected CPEs, exploit details, or a practical attack path. Debian and NetApp published advisories, while the CVE record notes vendor dispute of exploitability.

Likely exposure

Exposure is likely limited to environments running Unbound versions before 1.9.5 or downstream packages that included the affected code. The source bundle does not identify specific CPEs or product versions beyond Unbound before 1.9.5.

Exploitation context

No active exploitation is supported by the provided sources, and the CVE is not marked KEV. The CVE description explicitly says the vendor disputes vulnerability status and says a running installation cannot be remotely or locally exploited.

Researcher notes

Focus validation on version lineage and vendor backports, not exploit reproduction. The disputed status matters: public sources describe vulnerable-looking code, but also state a running Unbound installation cannot be exploited locally or remotely. Evidence is incomplete for severity scoring and product mapping.

Mitigation direction

  • Inventory Unbound deployments and package versions.
  • Upgrade Unbound to a vendor-supported version at or above 1.9.5 where applicable.
  • Apply Debian DLA 2652-1 or equivalent distribution security updates.
  • For NetApp environments, review advisory NTAP-20210507-0007 for product-specific guidance.
  • Track vendor guidance if exploitability or affected products are clarified later.

Validation and detection

  • Confirm whether Unbound is installed on servers, appliances, or container images.
  • Record exact Unbound package versions and distribution backport status.
  • Check whether installed packages include vendor security fixes for CVE-2019-25038.
  • Review Debian and NetApp advisories for environment-specific applicability.
  • Document the vendor exploitability dispute in the vulnerability record.
Prepared
Confidence
medium
Sources
5

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

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.

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CVE-2019-25038 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
4Source 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.