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CVE Record

CVE-2017-9345: In Wireshark 2.2.0 to 2.2.6 and 2.0.0 to 2.0.12, the DNS dissector could go into an infinite loop.

In Wireshark 2.2.0 to 2.2.6 and 2.0.0 to 2.0.12, the DNS dissector could go into an infinite loop. This was addressed in epan/dissectors/packet-dns.c by trying to detect self-referencing pointers.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a Wireshark denial-of-service issue. If an affected Wireshark version analyzes specially malformed DNS data, the DNS parser can loop indefinitely, tying up the application and disrupting packet-analysis workflows. The source bundle does not show code execution, data theft, or confirmed active exploitation.

Executive priority

Treat as a targeted operational reliability issue, not a broad enterprise compromise risk. Prioritize environments where Wireshark processes untrusted captures or supports incident response workflows, because hangs during analysis can slow detection and investigation.

Technical view

Wireshark 2.2.0 through 2.2.6 and 2.0.0 through 2.0.12 have a DNS dissector flaw that can enter an infinite loop. The described fix is in epan/dissectors/packet-dns.c, adding detection for self-referencing DNS pointers.

Likely exposure

Exposure is most likely on analyst workstations, SOC tooling, sandboxes, or automated pipelines that open untrusted packet captures or inspect live DNS traffic using affected Wireshark releases.

Exploitation context

The bundle marks KEV as false and provides no cited evidence of active exploitation. The practical risk is availability disruption when affected Wireshark parses malicious or malformed DNS content, not direct compromise based on the provided sources.

Researcher notes

Key evidence is the CVE description, Wireshark advisory, OSS-Fuzz bug, Bugzilla entry, and commit reference. The public bundle does not include CVSS, CWE, exploit status, or complete vendor fixed-version text, so avoid overstating severity.

Mitigation direction

  • Identify Wireshark installations in the affected 2.0.x and 2.2.x ranges.
  • Upgrade affected installations to a vendor-fixed Wireshark release.
  • Check Wireshark advisory WNPA-SEC-2017-26 for exact fixed-version guidance.
  • Limit opening untrusted capture files on affected analyst systems.
  • Prioritize shared analysis servers and automated capture-processing workflows.

Validation and detection

  • Inventory Wireshark versions on analyst endpoints and capture-processing systems.
  • Confirm no systems run 2.2.0-2.2.6 or 2.0.0-2.0.12.
  • Review package manager or endpoint inventory evidence after upgrades.
  • Verify compensating controls for untrusted packet captures where upgrades are delayed.
Prepared
Confidence
medium
Sources
6

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-2017-9345 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
5Source 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.