Telstra Company Cyber Security Posture
telstra.com.auWe believe it’s people who give purpose to our technology. So we’re committed to staying close to our customers and providing them the best experience. And delivering the best tech. On the best network. Because our purpose is to build a connected future so everyone can thrive. We build technology and content solutions that are simple and easy to use, including Australia’s largest and fastest national mobile network. That’s why we strive to serve and know our customers better than anyone else – offering a choice of not just digital connection, but digital content as well. And that’s why we have an international presence spanning 15 countries, including China. In the 21st century, opportunity belongs to connected businesses, governments, communities and individuals. As Australia’s leading telecommunications and information services company, Telstra is proud to be helping our customers improve the ways in which they live and work through connection. Be first to know about Telstra news, advice and offers, as well as updates on our people and partners: tel.st/subscribe
Telstra Company Details
telstra
35264 employees
403314.0
517
Telecommunications
telstra.com.au
Scan still pending
TEL_3122641
In-progress
Telstra Risk Score (AI oriented)Between 900 and 1000
This score is AI-generated and less favored by cyber insurers, who prefer the TPRM score.
Telstra Global Score.png)
Telstra Company Scoring based on AI Models
| Model Name | Date | Description | Current Score Difference | Score |
|---|---|---|---|---|
| AVERAGE-Industry | 03-12-2025 | This score represents the average cybersecurity rating of companies already scanned within the same industry. It provides a benchmark to compare an individual company's security posture against its industry peers. | N/A | Between 900 and 1000 |
Telstra Company Cyber Security News & History
| Entity | Type | Severity | Impact | Seen | Url ID | Details | View |
|---|---|---|---|---|---|---|---|
| Telstra | Vulnerability | 85 | 4 | 03/2018 | TEL141210622 | Link | |
Rankiteo Explanation : Attack with significant impact with customers data leaksDescription: A flaw in medical software used by more than 40,000 Australian health specialists and distributed by Telstra has potentially exposed Australians' medical information to hackers. Hackers have been logging into practitioners' computers and servers to carry out illegal activities. The flaw in the "secure" messaging software is specifically leaving computers with remote desktop software installed wide open because it creates a separate username with a static default password that will allow for an easy intrusion. | |||||||
| Telstra | Breach | 80 | 3 | 10/2022 | TEL23611122 | Link | |
Rankiteo Explanation : Attack with significant impact with internal employee data leaksDescription: Australia's largest telecoms firm Telstra Corp Ltd suffered a data breach incident which affected around 30,000 current and former employees. The breach compromised basic information like names and email addresses. | |||||||
| Telstra | Breach | 60 | 4 | 07/2018 | TEL025101122 | Link | |
Rankiteo Explanation : Attack with significant impact with customers data leaksDescription: A 63-year-old layman was been able to access a Telstra database containing the contact details of their customers. Once he signed in, he put in the search term “email” and it returned 66,500 results containing names, addresses, email addresses and phone numbers. Telstra has also since identified two other customers who were able to access the database. | |||||||
| Telstra | Data Leak | 50 | 1 | 12/2011 | TEL2211121222 | Link | |
Rankiteo Explanation : Attack without any consequencesDescription: TELSTRA faced another data privacy breach incident after the email addresses and phone numbers of more than a thousand of its BigPond customers were made accessible online. An online spreadsheet containing customer names, email addresses and details of service support issues, was exposed. | |||||||
| Telstra | Data Leak | 85 | 4 | 05/2021 | TEL15346123 | Link | |
Rankiteo Explanation : Attack with significant impact with customers data leaksDescription: Australian telecom firm Telstra was hit by a cyber attack result of which the hackers gained access to 10000 SIM cards. The compromised information included financial information, contracts, and banking information of the SIM card users. The company’s website has been offline for days after a hacker group said it infiltrated the company’s data systems and posted a disturbing ransom note on the dark web. | |||||||
Telstra Company Subsidiaries
We believe it’s people who give purpose to our technology. So we’re committed to staying close to our customers and providing them the best experience. And delivering the best tech. On the best network. Because our purpose is to build a connected future so everyone can thrive. We build technology and content solutions that are simple and easy to use, including Australia’s largest and fastest national mobile network. That’s why we strive to serve and know our customers better than anyone else – offering a choice of not just digital connection, but digital content as well. And that’s why we have an international presence spanning 15 countries, including China. In the 21st century, opportunity belongs to connected businesses, governments, communities and individuals. As Australia’s leading telecommunications and information services company, Telstra is proud to be helping our customers improve the ways in which they live and work through connection. Be first to know about Telstra news, advice and offers, as well as updates on our people and partners: tel.st/subscribe
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Telstra Cyber Security News
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Frequently Asked Questions
Explore insights on cybersecurity incidents, risk posture, and Rankiteo's assessments.
Telstra CyberSecurity History Information
How many cyber incidents has Telstra faced?
Total Incidents: According to Rankiteo, Telstra has faced 5 incidents in the past.
What types of cybersecurity incidents have occurred at Telstra?
Incident Types: The types of cybersecurity incidents that have occurred incidents Breach, Vulnerability and Data Leak.
Incident Details
Can you provide details on each incident?
Incident : Data Breach
Title: Telstra Cyber Attack
Description: Australian telecom firm Telstra was hit by a cyber attack resulting in hackers gaining access to 10000 SIM cards. The compromised information included financial information, contracts, and banking information of the SIM card users. The company’s website has been offline for days after a hacker group said it infiltrated the company’s data systems and posted a disturbing ransom note on the dark web.
Type: Data Breach
Attack Vector: Unspecified
Threat Actor: Hacker Group
Motivation: Ransom
Incident : Data Breach
Title: Telstra BigPond Customer Data Breach
Description: Telstra faced a data privacy breach incident where the email addresses and phone numbers of more than a thousand of its BigPond customers were made accessible online. An online spreadsheet containing customer names, email addresses, and details of service support issues was exposed.
Type: Data Breach
Incident : Data Breach
Title: Telstra Database Breach
Description: A 63-year-old layman was able to access a Telstra database containing the contact details of their customers. Once he signed in, he put in the search term 'email' and it returned 66,500 results containing names, addresses, email addresses, and phone numbers. Telstra has also since identified two other customers who were able to access the database.
Type: Data Breach
Attack Vector: Unauthorized Access
Threat Actor: Layman
Incident : Data Breach
Title: Telstra Data Breach
Description: Australia's largest telecoms firm Telstra Corp Ltd suffered a data breach incident which affected around 30,000 current and former employees. The breach compromised basic information like names and email addresses.
Type: Data Breach
Incident : Data Breach
Title: Medical Software Flaw Exposes Australians' Medical Information
Description: A flaw in medical software used by more than 40,000 Australian health specialists and distributed by Telstra has potentially exposed Australians' medical information to hackers. Hackers have been logging into practitioners' computers and servers to carry out illegal activities. The flaw in the 'secure' messaging software is specifically leaving computers with remote desktop software installed wide open because it creates a separate username with a static default password that will allow for an easy intrusion.
Type: Data Breach
Attack Vector: Exploitation of Default Credentials
Vulnerability Exploited: Static default password in remote desktop software
Threat Actor: Hackers
Motivation: Illegal activities
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 Remote desktop software.
Impact of the Incidents
What was the impact of each incident?
Incident : Data Breach TEL15346123
Data Compromised: financial information, contracts, banking information
Systems Affected: website
Downtime: days
Incident : Data Breach TEL2211121222
Data Compromised: email addresses, phone numbers, customer names, details of service support issues
Incident : Data Breach TEL025101122
Data Compromised: Names, Addresses, Email Addresses, Phone Numbers
Systems Affected: Telstra Database
Incident : Data Breach TEL23611122
Data Compromised: names, email addresses
Incident : Data Breach TEL141210622
Data Compromised: Medical information
Systems Affected: Computers with remote desktop software
What types of data are most commonly compromised in incidents?
Commonly Compromised Data Types: The types of data most commonly compromised in incidents are financial information, contracts, banking information, email addresses, phone numbers, customer names, details of service support issues, Personal Information, names, email addresses and Medical information.
Which entities were affected by each incident?
Incident : Data Breach TEL15346123
Entity Type: Telecom Firm
Industry: Telecommunications
Location: Australia
Customers Affected: 10000
Incident : Data Breach TEL2211121222
Entity Type: Telecommunications Company
Industry: Telecommunications
Customers Affected: More than a thousand BigPond customers
Incident : Data Breach TEL025101122
Entity Type: Telecommunications Company
Industry: Telecommunications
Customers Affected: 66500
Incident : Data Breach TEL23611122
Entity Type: Telecoms Firm
Industry: Telecommunications
Location: Australia
Customers Affected: 30,000 current and former employees
Incident : Data Breach TEL141210622
Entity Type: Company
Industry: Telecommunications
Location: Australia
Customers Affected: More than 40,000 Australian health specialists
Data Breach Information
What type of data was compromised in each breach?
Incident : Data Breach TEL15346123
Type of Data Compromised: financial information, contracts, banking information
Number of Records Exposed: 10000
Incident : Data Breach TEL2211121222
Type of Data Compromised: email addresses, phone numbers, customer names, details of service support issues
Number of Records Exposed: More than a thousand
Incident : Data Breach TEL025101122
Type of Data Compromised: Personal Information
Number of Records Exposed: 66500
Personally Identifiable Information: True
Incident : Data Breach TEL23611122
Type of Data Compromised: names, email addresses
Number of Records Exposed: 30,000
Incident : Data Breach TEL141210622
Type of Data Compromised: Medical information
Sensitivity of Data: High
Initial Access Broker
How did the initial access broker gain entry for each incident?
Incident : Data Breach TEL141210622
Entry Point: Remote desktop software
Post-Incident Analysis
What were the root causes and corrective actions taken for each incident?
Incident : Data Breach TEL141210622
Root Causes: Static default password in remote desktop software
Additional Questions
General Information
Who was the attacking group in the last incident?
Last Attacking Group: The attacking group in the last incident were an Hacker Group, Layman and Hackers.
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 financial information, contracts, banking information, email addresses, phone numbers, customer names, details of service support issues, Names, Addresses, Email Addresses, Phone Numbers, names, email addresses and Medical information.
What was the most significant system affected in an incident?
Most Significant System Affected: The most significant system affected in an incident was website and Telstra Database and Computers with remote desktop software.
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 financial information, contracts, banking information, email addresses, phone numbers, customer names, details of service support issues, Names, Addresses, Email Addresses, Phone Numbers, names, email addresses and Medical information.
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 30.8K.
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 Remote desktop software.
What Do We Measure?
Every week, Rankiteo analyzes billions of signals to give organizations a sharper, faster view of emerging risks. With deeper, more actionable intelligence at their fingertips, security teams can outpace threat actors, respond instantly to Zero-Day attacks, and dramatically shrink their risk exposure window.
These are some of the factors we use to calculate the overall score:
Identify exposed access points, detect misconfigured SSL certificates, and uncover vulnerabilities across the network infrastructure.
Gain visibility into the software components used within an organization to detect vulnerabilities, manage risk, and ensure supply chain security.
Monitor and manage all IT assets and their configurations to ensure accurate, real-time visibility across the company's technology environment.
Leverage real-time insights on active threats, malware campaigns, and emerging vulnerabilities to proactively defend against evolving cyberattacks.
