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CVE Record

CVE-2020-16138: A denial-of-service issue in Cisco Unified IP Conference Station 7937G 1-4-4-0 through 1-4-5-7 allows attac...

A denial-of-service issue in Cisco Unified IP Conference Station 7937G 1-4-4-0 through 1-4-5-7 allows attackers to remotely disable the device until it is power cycled. Note: We cannot prove this vulnerability exists. Out of an abundance of caution, this CVE is being assigned to better serve our customers and ensure all who are still running this product understand that the product is end of life and should be removed or upgraded. For more information on this, and how to upgrade, refer to the CVE’s reference information

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This CVE describes a possible remote denial-of-service condition affecting Cisco Unified IP Conference Station 7937G firmware 1-4-4-0 through 1-4-5-7. Affected devices may be disabled until power-cycled. The CVE explicitly says the issue could not be proven, but highlights that the product is end of life and should be removed or upgraded.

Executive priority

Treat this as a targeted legacy-device cleanup item. It is not supported by confirmed active exploitation evidence, but end-of-life conference phones can create avoidable outage risk and should be replaced or retired.

Technical view

The record reports a remotely triggerable availability issue against Cisco 7937G conference stations on versions 1-4-4-0 through 1-4-5-7. No CVSS, CWE, confirmed proof, or vendor patch is provided in the bundle. References point to public disclosure pages and Cisco end-of-life guidance for migration or removal.

Likely exposure

Exposure is likely limited to organizations still operating Cisco Unified IP Conference Station 7937G devices, especially on the named firmware range. Business risk is device availability disruption, not data theft, based on the supplied record.

Exploitation context

The bundle includes public disclosure references but no evidence of active exploitation. The CVE is not listed as KEV. The CVE text also states the vulnerability could not be proven, so exploitation confidence is limited.

Researcher notes

Evidence quality is limited because the CVE says the issue could not be proven and provides no CVSS or CWE. Analysis should focus on asset presence, firmware range, exposure, and Cisco migration guidance rather than exploit reproduction.

Mitigation direction

  • Inventory Cisco Unified IP Conference Station 7937G devices.
  • Confirm firmware versions against 1-4-4-0 through 1-4-5-7.
  • Review Cisco end-of-life guidance for replacement or upgrade options.
  • Remove or migrate remaining end-of-life devices where feasible.
  • Check vendor guidance before assuming a patch exists.

Validation and detection

  • Search asset inventory for Cisco 7937G conference stations.
  • Compare device firmware to the CVE's affected range.
  • Confirm whether devices are still business-critical.
  • Review network monitoring for unexplained 7937G outages or power-cycle recoveries.
  • Document replacement status for any remaining devices.
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-2020-16138 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.