LC
Company Details
Linkedin ID:
level-3-communications
Website:
Employees number:
6,794
Number of followers:
137,618
NAICS:
517
Industry Type:
Homepage:
centurylink.com
IP Addresses:
0
Company ID:
LEV_3143099
Scan Status:
In-progress
Level 3 Communications Company CyberSecurity Posture
centurylink.com
CenturyLink (NYSE: CTL) is a technology leader delivering hybrid networking, cloud connectivity, and security solutions to customers around the world. Through its extensive global fiber network, CenturyLink provides secure and reliable services to meet the growing digital demands of businesses and consumers. CenturyLink strives to be the trusted connection to the networked world and is focused on delivering technology that enhances the customer experience.
Level 3 Communications A.I CyberSecurity Scoring
LC Risk Score (AI oriented)Between 750 and 799
LC
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LC Global Score (TPRM)XXXX
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LC Company CyberSecurity News & History
Past Incidents
1
Attack Types
1
CenturyLink Communications
Breach
Rankiteo Explanation
Attack with significant impact with customers data leaks
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.
LC Company Scoring based on AI Models
Cyber Incidents Likelihood 3 - 6 - 9 months
A.I Risk Score Likelihood 3 - 6 - 9 months
Underwriter Stats for LC
Incidents vs Telecommunications Industry Average (This Year)
No incidents recorded for Level 3 Communications in 2025.
Incidents vs All-Companies Average (This Year)
No incidents recorded for Level 3 Communications in 2025.
Incident Types LC vs Telecommunications Industry Avg (This Year)
No incidents recorded for Level 3 Communications in 2025.
Incident History — LC (X = Date, Y = Severity)
LC cyber incidents detection timeline including parent company and subsidiaries
LC Company Subsidiaries
CenturyLink (NYSE: CTL) is a technology leader delivering hybrid networking, cloud connectivity, and security solutions to customers around the world. Through its extensive global fiber network, CenturyLink provides secure and reliable services to meet the growing digital demands of businesses and consumers. CenturyLink strives to be the trusted connection to the networked world and is focused on delivering technology that enhances the customer experience.
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Frequently Asked Questions
Explore insights on cybersecurity incidents, risk posture, and Rankiteo's assessments.
LC CyberSecurity History Information
Official Website of Level 3 Communications
The official website of Level 3 Communications is http://www.centurylink.com.
Level 3 Communications’s AI-Generated Cybersecurity Score
According to Rankiteo, Level 3 Communications’s AI-generated cybersecurity score is 751, reflecting their Fair security posture.
How many security badges does Level 3 Communications’ have ?
According to Rankiteo, Level 3 Communications currently holds 0 security badges, indicating that no recognized compliance certifications are currently verified for the organization.
Does Level 3 Communications have SOC 2 Type 1 certification ?
According to Rankiteo, Level 3 Communications is not certified under SOC 2 Type 1.
Does Level 3 Communications have SOC 2 Type 2 certification ?
According to Rankiteo, Level 3 Communications does not hold a SOC 2 Type 2 certification.
Does Level 3 Communications comply with GDPR ?
According to Rankiteo, Level 3 Communications is not listed as GDPR compliant.
Does Level 3 Communications have PCI DSS certification ?
According to Rankiteo, Level 3 Communications does not currently maintain PCI DSS compliance.
Does Level 3 Communications comply with HIPAA ?
According to Rankiteo, Level 3 Communications is not compliant with HIPAA regulations.
Does Level 3 Communications have ISO 27001 certification ?
According to Rankiteo,Level 3 Communications is not certified under ISO 27001, indicating the absence of a formally recognized information security management framework.
Industry Classification of Level 3 Communications
Level 3 Communications operates primarily in the Telecommunications industry.
Number of Employees at Level 3 Communications
Level 3 Communications employs approximately 6,794 people worldwide.
Subsidiaries Owned by Level 3 Communications
Level 3 Communications presently has no subsidiaries across any sectors.
Level 3 Communications’s LinkedIn Followers
Level 3 Communications’s official LinkedIn profile has approximately 137,618 followers.
NAICS Classification of Level 3 Communications
Level 3 Communications is classified under the NAICS code 517, which corresponds to Telecommunications.
Level 3 Communications’s Presence on Crunchbase
Yes, Level 3 Communications has an official profile on Crunchbase, which can be accessed here: https://www.crunchbase.com/organization/level-2.
Level 3 Communications’s Presence on LinkedIn
Yes, Level 3 Communications maintains an official LinkedIn profile, which is actively utilized for branding and talent engagement, which can be accessed here: https://www.linkedin.com/company/level-3-communications.
Cybersecurity Incidents Involving Level 3 Communications
As of November 27, 2025, Rankiteo reports that Level 3 Communications has experienced 1 cybersecurity incidents.
Number of Peer and Competitor Companies
Level 3 Communications has an estimated 9,535 peer or competitor companies worldwide.
What types of cybersecurity incidents have occurred at Level 3 Communications ?
Incident Types: The types of cybersecurity incidents that have occurred include Breach.
How does Level 3 Communications detect and respond to cybersecurity incidents ?
Detection and Response: The company detects and responds to cybersecurity incidents through an remediation measures with customer notifications (via mail), and communication strategy with written notifications to affected customers..
Incident Details
Can you provide details on each incident ?
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
What are the most common types of attacks the company has faced ?
Common Attack Types: The most common types of attacks the company has faced is Breach.
How does the company identify the attack vectors used in incidents ?
Identification of Attack Vectors: The company identifies the attack vectors used in incidents through MyCenturyLink Customer Account Website.
Impact of the Incidents
What was the impact of each incident ?
Incident : Data Breach LEV801082025
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
What types of data are most commonly compromised in incidents ?
Commonly Compromised Data Types: The types of data most commonly compromised in incidents are Usernames, Email Addresses, First And Last Names, Service Addresses, Billing Addresses, Other Related Information and .
Which entities were affected by each incident ?
Incident : Data Breach LEV801082025
Entity Name: CenturyLink Communications (now Lumen Technologies)
Entity Type: Telecommunications Company
Industry: Telecommunications
Location: United States
Customers Affected: 1,942
Response to the Incidents
What measures were taken in response to each incident ?
Incident : Data Breach LEV801082025
Remediation Measures: Customer Notifications (via mail)
Communication Strategy: Written Notifications to Affected Customers
Data Breach Information
What type of data was compromised in each breach ?
Incident : Data Breach LEV801082025
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
What measures does the company take to prevent data exfiltration ?
Prevention of Data Exfiltration: The company takes the following measures to prevent data exfiltration: Customer Notifications (via mail), .
Regulatory Compliance
Were there any regulatory violations and fines imposed for each incident ?
Incident : Data Breach LEV801082025
Regulatory Notifications: Maine Office of the Attorney General
References
Where can I find more information about each incident ?
Incident : Data Breach LEV801082025
Source: Maine Office of the Attorney General
Where can stakeholders find additional resources on cybersecurity best practices ?
Additional Resources: Stakeholders can find additional resources on cybersecurity best practices at and Source: Maine Office of the Attorney General.
Investigation Status
How does the company communicate the status of incident investigations to stakeholders ?
Communication of Investigation Status: The company communicates the status of incident investigations to stakeholders through Written Notifications To Affected Customers.
Stakeholder and Customer Advisories
Were there any advisories issued to stakeholders or customers for each incident ?
Incident : Data Breach LEV801082025
Customer Advisories: Written notifications sent between September 21–25, 2020
What advisories does the company provide to stakeholders and customers following an incident ?
Advisories Provided: The company provides the following advisories to stakeholders and customers following an incident: were Written Notifications Sent Between September 21–25, 2020 and .
Initial Access Broker
How did the initial access broker gain entry for each incident ?
Incident : Data Breach LEV801082025
Entry Point: MyCenturyLink Customer Account Website
Post-Incident Analysis
What were the root causes and corrective actions taken for each incident ?
Incident : Data Breach LEV801082025
Root Causes: Weak Or Reused Passwords Vulnerable To Guessing Attacks,
Additional Questions
Incident Details
What was the most recent incident publicly disclosed ?
Most Recent Incident Publicly Disclosed: The most recent incident publicly disclosed was on 2020-09-21.
Impact of the Incidents
What was the most significant data compromised in an incident ?
Most Significant Data Compromised: The most significant data compromised in an incident were Usernames, Email Addresses, First and Last Names, Service Addresses, Billing Addresses, Other Related Information and .
What was the most significant system affected in an incident ?
Most Significant System Affected: The most significant system affected in an incident was MyCenturyLink Customer Account Website.
Data Breach Information
What was the most sensitive data compromised in a breach ?
Most Sensitive Data Compromised: The most sensitive data compromised in a breach were Billing Addresses, Email Addresses, First and Last Names, Other Related Information, Service Addresses and Usernames.
What was the number of records exposed in the most significant breach ?
Number of Records Exposed in Most Significant Breach: The number of records exposed in the most significant breach was 1.9K.
References
What is the most recent source of information about an incident ?
Most Recent Source: The most recent source of information about an incident is Maine Office of the Attorney General.
Stakeholder and Customer Advisories
What was the most recent customer advisory issued ?
Most Recent Customer Advisory: The most recent customer advisory issued were an Written notifications sent between September 21–25 and 2020.
Initial Access Broker
What was the most recent entry point used by an initial access broker ?
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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Latest Global CVEs (Not Company-Specific)
Description
Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to versions 19.2.16, 20.3.14, and 21.0.1, there is a XSRF token leakage via protocol-relative URLs in angular HTTP clients. The vulnerability is a Credential Leak by App Logic that leads to the unauthorized disclosure of the Cross-Site Request Forgery (XSRF) token to an attacker-controlled domain. Angular's HttpClient has a built-in XSRF protection mechanism that works by checking if a request URL starts with a protocol (http:// or https://) to determine if it is cross-origin. If the URL starts with protocol-relative URL (//), it is incorrectly treated as a same-origin request, and the XSRF token is automatically added to the X-XSRF-TOKEN header. This issue has been patched in versions 19.2.16, 20.3.14, and 21.0.1. A workaround for this issue involves avoiding using protocol-relative URLs (URLs starting with //) in HttpClient requests. All backend communication URLs should be hardcoded as relative paths (starting with a single /) or fully qualified, trusted absolute URLs.
Risk Information
cvss4
Base: 7.7
Severity: LOW
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
References
- https://github.com/angular/angular/commit/0276479e7d0e280e0f8d26fa567d3b7aa97a516f
- https://github.com/angular/angular/commit/05fe6686a97fa0bcd3cf157805b3612033f975bc
- https://github.com/angular/angular/commit/3240d856d942727372a705252f7c8c115394a41e
- https://github.com/angular/angular/releases/tag/19.2.16
- https://github.com/angular/angular/releases/tag/20.3.14
- https://github.com/angular/angular/releases/tag/21.0.1
- https://github.com/angular/angular/security/advisories/GHSA-58c5-g7wp-6w37
Description
Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. An Uncontrolled Recursion vulnerability in node-forge versions 1.3.1 and below enables remote, unauthenticated attackers to craft deep ASN.1 structures that trigger unbounded recursive parsing. This leads to a Denial-of-Service (DoS) via stack exhaustion when parsing untrusted DER inputs. This issue has been patched in version 1.3.2.
Risk Information
cvss4
Base: 8.7
Severity: LOW
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Description
Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. An Integer Overflow vulnerability in node-forge versions 1.3.1 and below enables remote, unauthenticated attackers to craft ASN.1 structures containing OIDs with oversized arcs. These arcs may be decoded as smaller, trusted OIDs due to 32-bit bitwise truncation, enabling the bypass of downstream OID-based security decisions. This issue has been patched in version 1.3.2.
Risk Information
cvss4
Base: 6.3
Severity: LOW
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Description
Suricata is a network IDS, IPS and NSM engine developed by the OISF (Open Information Security Foundation) and the Suricata community. Prior to versions 7.0.13 and 8.0.2, working with large buffers in Lua scripts can lead to a stack overflow. Users of Lua rules and output scripts may be affected when working with large buffers. This includes a rule passing a large buffer to a Lua script. This issue has been patched in versions 7.0.13 and 8.0.2. A workaround for this issue involves disabling Lua rules and output scripts, or making sure limits, such as stream.depth.reassembly and HTTP response body limits (response-body-limit), are set to less than half the stack size.
Risk Information
cvss3
Base: 7.5
Severity: LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Description
Suricata is a network IDS, IPS and NSM engine developed by the OISF (Open Information Security Foundation) and the Suricata community. In versions from 8.0.0 to before 8.0.2, a NULL dereference can occur when the entropy keyword is used in conjunction with base64_data. This issue has been patched in version 8.0.2. A workaround involves disabling rules that use entropy in conjunction with base64_data.
Risk Information
cvss3
Base: 7.5
Severity: LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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SBOM (Software Bill of Materials)
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