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CVE Record

CVE-2019-25040: Unbound before 1.9.5 allows an infinite loop via a compressed name in dname_pkt_copy.

Unbound before 1.9.5 allows an infinite loop via a compressed name in dname_pkt_copy. 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-2019-25040 describes a potential infinite loop in Unbound before 1.9.5 when copying a compressed DNS name. The CVE record notes the vendor disputes this as a vulnerability because a running Unbound installation is not believed to be remotely or locally exploitable. Treat it as low operational urgency unless vendor or distro guidance says your build is affected.

Executive priority

Low priority for emergency response. Handle through normal patch and asset-management processes, especially for systems covered by Debian or NetApp advisories. Escalate only if your vendor identifies exploitable exposure in your product build.

Technical view

The reported issue is in dname_pkt_copy handling of compressed names, potentially causing an infinite loop. Public metadata provides no CVSS, CWE, or concrete affected CPEs. Debian issued an Unbound 1.9 security update and NetApp published an advisory, but the CVE description includes a vendor non-exploitability dispute.

Likely exposure

Exposure is limited to environments running Unbound before 1.9.5 or downstream products that incorporate affected Unbound code. The provided CVE data does not identify exact CPEs or product versions beyond that threshold.

Exploitation context

No CISA KEV listing is provided and the source bundle does not cite active exploitation. The CVE description says the vendor disputes exploitability for running Unbound installations, so exploitation evidence is incomplete and points away from practical exposure.

Researcher notes

The key research issue is exploitability, not just code reachability. The CVE notes a possible infinite loop in dname_pkt_copy, but also records the vendor position that running installations cannot be exploited. Public metadata lacks CVSS, CWE, and precise CPE mappings.

Mitigation direction

  • Inventory Unbound instances and downstream products embedding Unbound.
  • Prioritize vendor or distribution guidance over generic remediation assumptions.
  • Upgrade Unbound packages where Debian, NetApp, or your vendor recommends it.
  • Document any accepted risk where vendor guidance confirms non-exploitability.

Validation and detection

  • Check deployed Unbound versions against the before-1.9.5 threshold.
  • Review OS and appliance advisories for backported fixes.
  • Confirm whether affected systems use vendor-supported packages.
  • Record KEV status as not listed based on the provided bundle.
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.

ATT&CK lookup starting points

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CVE-2019-25040 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.