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CVE-2020-16139 (GCVE-0-2020-16139)

Vulnerability from cvelistv5 – Published: 2020-08-12 20:10 – Updated: 2024-08-04 13:37 Unsupported When Assigned
VLAI Shadowserver Previdian
Summary
A denial-of-service in Cisco Unified IP Conference Station 7937G 1-4-4-0 through 1-4-5-7 allows attackers restart the device remotely through sending specially crafted packets. 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
Severity
No CVSS data available.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-11 16:16 UTC
CWE
  • n/a
Assigner
References
Impacted products
Vendor Product Version CPE status
cisco unified_ip_conference_station_7937g_firmware Affected: 1.4.4.0 , ≤ 1.4.5.7 (custom)
    cpe:2.3:o:cisco:unified_ip_conference_station_7937g_firmware:1.4.4.0:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2020-08-07 00:00
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 564f9074-8de5-42c2-93dc-5aef5a9742af

Vulnerability ID: CVE-2020-16139

Status: Confirmed

Status Updated: 2026-07-20 00:00 UTC

Exploited: Yes

Characteristics
Severity: 75.0
Timestamps
First Seen: 2025-06-08
Asserted: 2025-06-08
Last Seen: 2026-07-20
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Cisco / Cisco Unified IP Conference Station 7937G | Class: voip | Severity: High (CVSS 7.5) | IoT: no | In CISA KEV: no | Honeypot connections on 2026-07-20: 1
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class voip
7D Avg 0
Vendor Cisco
30D Avg 0
90D Avg 0
Product Cisco Unified IP Conference Station 7937G
Cisa Kev no
Connections 1
Observation Date 2026-07-20
Vulnerability Class CVSS
Vulnerability Score 7.5
Vulnerability Severity High
References
Created: 2026-06-30 09:23 UTC | Updated: 2026-07-22 01:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 951c7e42-8ff0-4285-9c3b-3d33b12097a5

Vulnerability ID: CVE-2020-16139

Status: Confirmed

Status Updated: 2026-02-10 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-02-10
Asserted: 2026-02-10
Scope
Notes: KEVIntel entry: A denial-of-service in Cisco Unified IP Conference Station 7937G 1-4-4-0 through 1-4-5-7 allows attackers restart the device remotely through... | Affected: Cisco / Unified IP Conference Station 7937G | CVSS: 7.5 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title A denial-of-service in Cisco Unified IP Conference Station 7937G 1-4-4-0 through 1-4-5-7 allows attackers restart the device remotely through...
Vendor Cisco
Product Unified IP Conference Station 7937G
Added Date 2026-02-10T00:00:00.000Z
Cvss Score 7.5
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-06-23 14:03 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.