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CVE Record

CVE-2019-25031: Unbound before 1.9.5 allows configuration injection in create_unbound_ad_servers.sh upon a successful man-i...

Unbound before 1.9.5 allows configuration injection in create_unbound_ad_servers.sh upon a successful man-in-the-middle attack against a cleartext HTTP session. NOTE: The vendor does not consider this a vulnerability of the Unbound software. create_unbound_ad_servers.sh is a contributed script from the community that facilitates automatic configuration creation. It is not part of the Unbound installation

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This issue concerns a community-contributed Unbound helper script, not the core Unbound DNS server installation. If the script created configuration through a cleartext HTTP session, a successful network man-in-the-middle could inject configuration content. Business urgency depends on whether the script was present and used.

Executive priority

Treat this as a targeted configuration-integrity risk, not a broad Unbound DNS server compromise. Prioritize environments that used the contributed ad-server script or received it through packaging.

Technical view

CVE-2019-25031 describes configuration injection in create_unbound_ad_servers.sh before Unbound 1.9.5, requiring a successful man-in-the-middle attack against cleartext HTTP. The CVE notes the vendor does not consider it an Unbound software vulnerability because the script is community-contributed and not part of the default installation.

Likely exposure

Exposure is likely limited to environments that installed or used create_unbound_ad_servers.sh, especially through distribution packages or custom automation. Standard Unbound deployments without this contributed script are not clearly exposed from the provided evidence.

Exploitation context

No source in the bundle indicates active exploitation, and the CVE is not in KEV. Exploitation requires network positioning sufficient for man-in-the-middle interference with a cleartext HTTP session used by the script.

Researcher notes

The strongest limiting facts are dependency on the contributed script, cleartext HTTP, and a successful MITM. Affected products are not enumerated in the CVE bundle, so product exposure must be validated from local packages and vendor advisories.

Mitigation direction

  • Check vendor and distribution advisories for corrected Unbound packages.
  • Upgrade affected packages where Debian or another vendor provides a security update.
  • Remove or disable create_unbound_ad_servers.sh if it is not operationally required.
  • Avoid configuration generation paths that depend on cleartext HTTP.
  • Review generated Unbound configuration for unauthorized or unexpected entries.

Validation and detection

  • Inventory systems for Unbound versions before 1.9.5.
  • Check whether create_unbound_ad_servers.sh exists on managed hosts.
  • Review cron jobs, deployment scripts, and automation for script execution.
  • Confirm whether any script downloads used cleartext HTTP.
  • Compare generated Unbound configuration against approved baselines.
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-2019-25031 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.