Company Details
lumentechnologies
49,841
597,638
517
lumen.com
0
LUM_6397940
In-progress


Lumen Technologies Vendor Cyber Rating & Cyber Score
lumen.comLumen connects the world. We digitally connect people, data and applications – quickly, securely and effortlessly. Everything we do at Lumen takes advantage of our network strength. From metro connectivity to long-haul data transport to our edge cloud, security, and managed service capabilities, we meet our customers’ needs today and as they build for tomorrow.
Company Details
lumentechnologies
49,841
597,638
517
lumen.com
0
LUM_6397940
In-progress
Between 750 and 799

Lumen Technologies Global Score (TPRM)XXXX

Description: Lumen Technologies, a leading provider of telecommunications services, identified two cybersecurity issues, including a ransomware attack. One of the events involved a ransomware attack on a small number of its servers that operate a segmented hosting service. The corporation simply acknowledged that the issue "is currently impairing the operations of a small number of the Company's enterprise customers." It gave no further information regarding the family of ransomware that infected its systems. Lumen developed improved security software following the ransomware attack's detection, which enabled the business to identify a different incursion.
Description: The Maine Office of the Attorney General disclosed a data breach affecting CenturyLink Communications between August 20 and August 31, 2020. The incident stemmed from a sophisticated password-guessing attack targeting the MyCenturyLink customer portal, compromising 1,942 accounts. Exposed data included usernames, email addresses, full names (first and last), service addresses, billing addresses, and related account details. While no financial or highly sensitive information (e.g., Social Security numbers, payment card data) was confirmed stolen, the breach risked unauthorized access to personal and account-specific information, potentially enabling phishing, identity fraud, or further targeted attacks. CenturyLink responded by issuing written notifications to affected customers between September 21–25, 2020, though the delay between discovery and disclosure raised concerns about proactive mitigation. The attack highlighted vulnerabilities in authentication mechanisms, emphasizing the need for stronger password policies and multi-factor authentication (MFA) to prevent credential-stuffing exploits.
Description: The personal information of hundreds of thousands of CenturyLink customers, including names, addresses, email addresses, and phone numbers was exposed online. A database of 2.8m records containing sensitive information regarding hundreds of thousands of CenturyLink’s customers was left open online for anyone with internet access to see. They included multiple pieces of personal information including name, email address, phone number, and address, along with account-specific information. The database comprised API logs with customer information and contained more than 2.8 million records in total. CenturyLink said to the affected customers. "We will continue to work to protect customer information, takes the protection of our customers’ information seriously, and we will work to ensure that we earn our customers’ trust.


No incidents recorded for Lumen Technologies in 2026.
No incidents recorded for Lumen Technologies in 2026.
No incidents recorded for Lumen Technologies in 2026.
Lumen Technologies cyber incidents detection timeline including parent company and subsidiaries

Lumen connects the world. We digitally connect people, data and applications – quickly, securely and effortlessly. Everything we do at Lumen takes advantage of our network strength. From metro connectivity to long-haul data transport to our edge cloud, security, and managed service capabilities, we meet our customers’ needs today and as they build for tomorrow.


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A TIM é a empresa de telefonia móvel que mais cresce no Brasil. Atualmente, possui mais de 13 mil colaboradores em todo o país que trabalham entregando serviços inovadores e de qualidade em telefonia móvel, fixa e internet banda larga. É uma companhia feita de pessoas criativas, com energia real
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Lumen Technologies announced a leadership shake up, including the retirement of its Board Chair and several Board transitions.
Lumen Technologies is leveraging artificial intelligence to cut $1 billion in network costs. The company is implementing AI-driven solutions...
The Cybersecurity and Infrastructure Security Agency has named Nick Andersen, executive assistant director for cybersecurity,...
Lumen Technologies expands APAC cybersecurity capabilities in collaboration with Palo Alto Networks ... SINGAPORE – Media OutReach Newswire – 23...
Lumen Technologies Expands APAC Cybersecurity Capabilities With Palo Alto Networks Partnership ... Lumen Technologies has expanded its...
The WSJ Pro Cyber Index of top 20 public cybersecurity firms by market capitalization ended 2025 up more than 27%.
PRNewswire/ -- Silicon Labs (NASDAQ: SLAB), the leading innovator in low-power wireless, today announced Ian N. Dawson has joined the...
What Happened? Shares of telecommunications infrastructure company Lumen Technologies NYSE:LUMN fell 4.2% in the afternoon session after a...
Partnering with Palo Alto Networks allows Lumen to deliver a unified, intelligence-driven platform that not only strengthens security operations but also...

Explore insights on cybersecurity incidents, risk posture, and Rankiteo's assessments.
The official website of Lumen Technologies is http://www.lumen.com.
According to Rankiteo, Lumen Technologies’s AI-generated cybersecurity score is 758, reflecting their Fair security posture.
According to Rankiteo, Lumen Technologies currently holds 0 security badges, indicating that no recognized compliance certifications are currently verified for the organization.
According to Rankiteo, Lumen Technologies has not been affected by any supply chain cyber incidents, and no incident IDs are currently listed for the organization.
According to Rankiteo, Lumen Technologies is not certified under SOC 2 Type 1.
According to Rankiteo, Lumen Technologies does not hold a SOC 2 Type 2 certification.
According to Rankiteo, Lumen Technologies is not listed as GDPR compliant.
According to Rankiteo, Lumen Technologies does not currently maintain PCI DSS compliance.
According to Rankiteo, Lumen Technologies is not compliant with HIPAA regulations.
According to Rankiteo,Lumen Technologies is not certified under ISO 27001, indicating the absence of a formally recognized information security management framework.
Lumen Technologies operates primarily in the Telecommunications industry.
Lumen Technologies employs approximately 49,841 people worldwide.
Lumen Technologies presently has no subsidiaries across any sectors.
Lumen Technologies’s official LinkedIn profile has approximately 597,638 followers.
Lumen Technologies is classified under the NAICS code 517, which corresponds to Telecommunications.
No, Lumen Technologies does not have a profile on Crunchbase.
Yes, Lumen Technologies maintains an official LinkedIn profile, which is actively utilized for branding and talent engagement, which can be accessed here: https://www.linkedin.com/company/lumentechnologies.
As of April 02, 2026, Rankiteo reports that Lumen Technologies has experienced 3 cybersecurity incidents.
Lumen Technologies has an estimated 10,042 peer or competitor companies worldwide.
Incident Types: The types of cybersecurity incidents that have occurred include Data Leak, Ransomware and Breach.
Detection and Response: The company detects and responds to cybersecurity incidents through an communication strategy with centurylink informed affected customers, and remediation measures with developed improved security software, and remediation measures with customer notifications (via mail), and communication strategy with written notifications to affected customers..
Title: CenturyLink Customer Data Exposure
Description: The personal information of hundreds of thousands of CenturyLink customers, including names, addresses, email addresses, and phone numbers was exposed online.
Type: Data Breach
Title: Ransomware Attack on Lumen Technologies
Description: Lumen Technologies, a leading provider of telecommunications services, identified two cybersecurity issues, including a ransomware attack. One of the events involved a ransomware attack on a small number of its servers that operate a segmented hosting service. The corporation simply acknowledged that the issue 'is currently impairing the operations of a small number of the Company's enterprise customers.' It gave no further information regarding the family of ransomware that infected its systems. Lumen developed improved security software following the ransomware attack's detection, which enabled the business to identify a different incursion.
Type: Ransomware
Title: CenturyLink Communications Data Breach (2020)
Description: The Maine Office of the Attorney General reported a data breach involving CenturyLink Communications, with the breach occurring between August 20 and August 31, 2020. Approximately 1,942 accounts were affected due to a sophisticated password guessing attack on the MyCenturyLink customer account website, potentially exposing usernames, email addresses, first and last names, service and billing addresses, and other related information. Written notifications were sent to customers starting September 21, 2020, with all letters mailed by September 25, 2020.
Date Publicly Disclosed: 2020-09-21
Type: Data Breach
Attack Vector: Password Guessing Attack
Vulnerability Exploited: Weak or Reused Passwords
Common Attack Types: The most common types of attacks the company has faced is Ransomware.
Identification of Attack Vectors: The company identifies the attack vectors used in incidents through MyCenturyLink Customer Account Website.

Data Compromised: Names, Addresses, Email addresses, Phone numbers, Account-specific information
Systems Affected: database

Systems Affected: Segmented hosting service servers
Operational Impact: Impairing the operations of a small number of the Company's enterprise customers

Data Compromised: Usernames, Email addresses, First and last names, Service addresses, Billing addresses, Other related information
Systems Affected: MyCenturyLink Customer Account Website
Identity Theft Risk: Potential
Commonly Compromised Data Types: The types of data most commonly compromised in incidents are Personal Information, Account-Specific Information, , Usernames, Email Addresses, First And Last Names, Service Addresses, Billing Addresses, Other Related Information and .

Entity Name: CenturyLink
Entity Type: Corporation
Industry: Telecommunications
Customers Affected: hundreds of thousands

Entity Name: Lumen Technologies
Entity Type: Corporation
Industry: Telecommunications
Customers Affected: Small number of enterprise customers

Entity Name: CenturyLink Communications (now Lumen Technologies)
Entity Type: Telecommunications Company
Industry: Telecommunications
Location: United States
Customers Affected: 1,942

Communication Strategy: CenturyLink informed affected customers

Remediation Measures: Developed improved security software

Remediation Measures: Customer Notifications (via mail)
Communication Strategy: Written Notifications to Affected Customers

Type of Data Compromised: Personal information, Account-specific information
Number of Records Exposed: 2.8 million
File Types Exposed: API logs
Personally Identifiable Information: namesaddressesemail addressesphone numbers

Type of Data Compromised: Usernames, Email addresses, First and last names, Service addresses, Billing addresses, Other related information
Number of Records Exposed: 1,942
Sensitivity of Data: Moderate (PII)
Data Exfiltration: Potential
Personally Identifiable Information: Yes
Prevention of Data Exfiltration: The company takes the following measures to prevent data exfiltration: Developed improved security software, , Customer Notifications (via mail), .

Regulatory Notifications: Maine Office of the Attorney General

Source: Maine Office of the Attorney General
Additional Resources: Stakeholders can find additional resources on cybersecurity best practices at and Source: Maine Office of the Attorney General.
Communication of Investigation Status: The company communicates the status of incident investigations to stakeholders through CenturyLink informed affected customers and Written Notifications To Affected Customers.

Customer Advisories: CenturyLink informed affected customers

Customer Advisories: Written notifications sent between September 21–25, 2020
Advisories Provided: The company provides the following advisories to stakeholders and customers following an incident: were CenturyLink informed affected customers, Written Notifications Sent Between September 21–25, 2020 and .

Entry Point: MyCenturyLink Customer Account Website

Root Causes: Weak Or Reused Passwords Vulnerable To Guessing Attacks,
Most Recent Incident Publicly Disclosed: The most recent incident publicly disclosed was on 2020-09-21.
Most Significant Data Compromised: The most significant data compromised in an incident were names, addresses, email addresses, phone numbers, account-specific information, , Usernames, Email Addresses, First and Last Names, Service Addresses, Billing Addresses, Other Related Information and .
Most Significant System Affected: The most significant system affected in an incident was database and Segmented hosting service servers and MyCenturyLink Customer Account Website.
Most Sensitive Data Compromised: The most sensitive data compromised in a breach were Service Addresses, Usernames, account-specific information, email addresses, phone numbers, addresses, Email Addresses, names, Other Related Information, Billing Addresses and First and Last Names.
Number of Records Exposed in Most Significant Breach: The number of records exposed in the most significant breach was 2.8M.
Most Recent Source: The most recent source of information about an incident is Maine Office of the Attorney General.
Most Recent Customer Advisory: The most recent customer advisory issued were an CenturyLink informed affected customers, Written notifications sent between September 21–25 and 2020.
Most Recent Entry Point: The most recent entry point used by an initial access broker was an MyCenturyLink Customer Account Website.
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A vulnerability was found in Nothings stb up to 1.26. Impacted is the function stbtt_InitFont_internal in the library stb_truetype.h of the component TTF File Handler. Performing a manipulation results in out-of-bounds read. Remote exploitation of the attack is possible. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.
V-SFT versions 6.2.10.0 and prior contain an out-of-bounds read in VS6ComFile!get_macro_mem_COM. Opening a crafted V7 file may lead to information disclosure from the affected product.
V-SFT versions 6.2.10.0 and prior contain a stack-based buffer overflow in VS6ComFile!CSaveData::_conv_AnimationItem. Opening a crafted V7 file may lead to arbitrary code execution on the affected product.
V-SFT versions 6.2.10.0 and prior contain an out-of-bounds read vulnerability in VS6MemInIF!set_temp_type_default. Opening a crafted V7 file may lead to information disclosure from the affected product.
V-SFT versions 6.2.10.0 and prior contain an out-of-bounds read vulnerability in VS6ComFile!load_link_inf. Opening a crafted V7 file may lead to information disclosure from the affected product.

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