Comparison Overview

Vivo (Telefônica Brasil)

VS

Zain Group

Vivo (Telefônica Brasil)

Avenida Eng. Luís Carlos Berrini, 1376, São Paulo, 04571 - 000, BR
Last Update: 2026-04-01
Between 800 and 849

Vivo (Telefônica Brasil) is part of the Telefónica Group and with more than 94 million customers, of which 75 million mobile and 19 million fixed, we are the largest telecommunications company in Brazil, with nationwide presence and a complete, convergent portfolio of products, combining fixed, mobile and digital services. Our purpose is “Digitalize to Bring Closer”, helping to build a digital nation and transforming the life of our customers. More and more, we connect people and things with Fiber, 4G and 4.5G and cover more cities with the network quality that only Vivo has. Today, we cover around 90% of the population with 4G and are accelerating the launch of cities with 4.5G, using carrier aggregation technology. In the fixed operation, we ended 2019 with 21 million homes-passed (HPs) with fiber optic technology, of which 11 million HPs with FTTH (fiber to the home). In addition, all cities with FTTH technology also offer TV over fiber (IPTV), aiming to offer the best speed and experience to our consumers. At Vivo, we also do more than just telecommunications. Within the Group, we have the Telefônica Vivo Foundation, that is committed to making education a priority, developing projects that are based on human potential and use technology as an instrument in favor of inclusion and digital culture.

NAICS: 517
NAICS Definition: Telecommunications
Employees: 38,994
Subsidiaries: 20
12-month incidents
0
Known data breaches
2
Attack type number
2

Zain Group

Airport Road, P.O. Box 22244, Kuwait, KW
Last Update: 2026-03-27
Between 750 and 799

Zain Group is a leading provider of innovative ICT technologies & digital lifestyle communications operating in 8 markets across the Middle East & Africa, serving 51.3 million active customers as of 30 September 2025. Zain provides mobile voice, data and B2B services in: Kuwait, Bahrain, Iraq, Jordan, Saudi Arabia, Sudan and South Sudan. Headquartered in the UAE, ZainTECH, the Group’s one-stop digital and ICT solutions provider, is playing a key role in the digital transformation of enterprise and government clientele across the MENA region. Also UAE based, Zain Omantel International (ZOI) is revolutionizing the international telecommunications wholesale landscape as the premier wholesale powerhouse serving regional operators, international carriers, and global hyperscalers. In Morocco, Zain has a 15.5% stake in ‘INWI’, through a joint venture. Zain is listed on the Boursa Kuwait (stock ticker: ZAIN). We recommend the Investor Community to download the “Zain Group Investor Relations” Mobile App. For more, please email [email protected]

NAICS: 517
NAICS Definition: Telecommunications
Employees: 16,153
Subsidiaries: 1
12-month incidents
0
Known data breaches
0
Attack type number
1

Compliance Badges Comparison

Security & Compliance Standards Overview

https://images.rankiteo.com/companyimages/vivo-telefonicabr.jpeg
Vivo (Telefônica Brasil)
ISO 27001
ISO 27001 certification not verified
Not verified
SOC2 Type 1
SOC2 Type 1 certification not verified
Not verified
SOC2 Type 2
SOC2 Type 2 certification not verified
Not verified
GDPR
GDPR certification not verified
Not verified
PCI DSS
PCI DSS certification not verified
Not verified
HIPAA
HIPAA certification not verified
Not verified
https://images.rankiteo.com/companyimages/zain.jpeg
Zain Group
ISO 27001
ISO 27001 certification not verified
Not verified
SOC2 Type 1
SOC2 Type 1 certification not verified
Not verified
SOC2 Type 2
SOC2 Type 2 certification not verified
Not verified
GDPR
GDPR certification not verified
Not verified
PCI DSS
PCI DSS certification not verified
Not verified
HIPAA
HIPAA certification not verified
Not verified
Compliance Summary
Vivo (Telefônica Brasil)
100%
Compliance Rate
0/4 Standards Verified
Zain Group
0%
Compliance Rate
0/4 Standards Verified

Benchmark & Cyber Underwriting Signals

Incidents vs Telecommunications Industry Average (This Year)

No incidents recorded for Vivo (Telefônica Brasil) in 2026.

Incidents vs Telecommunications Industry Average (This Year)

No incidents recorded for Zain Group in 2026.

Incident History — Vivo (Telefônica Brasil) (X = Date, Y = Severity)

Vivo (Telefônica Brasil) cyber incidents detection timeline including parent company and subsidiaries

Incident History — Zain Group (X = Date, Y = Severity)

Zain Group cyber incidents detection timeline including parent company and subsidiaries

Notable Incidents

Last 3 Security & Risk Events by Company

https://images.rankiteo.com/companyimages/vivo-telefonicabr.jpeg
Vivo (Telefônica Brasil)
Incidents

Date Detected: 12/2025
Type:Breach
Blog: Blog

Date Detected: 6/2025
Type:Breach
Motivation: Extortion
Blog: Blog

Date Detected: 5/2025
Type:Ransomware
Attack Vector: Internal Jira development and ticketing server
Motivation: Ransom
Blog: Blog
https://images.rankiteo.com/companyimages/zain.jpeg
Zain Group
Incidents

Date Detected: 6/2021
Type:Cyber Attack
Attack Vector: Exploitation of Public-Facing Application (CVE-2025-53770), DLL Side-Loading, Privilege Escalation (CVE-2021-36942), Living-off-the-Land (LotL) Tools
Motivation: Espionage, Credential Theft, Persistent Access
Blog: Blog

FAQ

Vivo (Telefônica Brasil) company demonstrates a stronger AI Cybersecurity Score compared to Zain Group company, reflecting its advanced cybersecurity posture governance and monitoring frameworks.

Vivo (Telefônica Brasil) company has faced a higher number of disclosed cyber incidents historically compared to Zain Group company.

In the current year, Zain Group company and Vivo (Telefônica Brasil) company have not reported any cyber incidents.

Vivo (Telefônica Brasil) company has confirmed experiencing a ransomware attack, while Zain Group company has not reported such incidents publicly.

Vivo (Telefônica Brasil) company has disclosed at least one data breach, while the other Zain Group company has not reported such incidents publicly.

Zain Group company has reported targeted cyberattacks, while Vivo (Telefônica Brasil) company has not reported such incidents publicly.

Neither Vivo (Telefônica Brasil) company nor Zain Group company has reported experiencing or disclosing vulnerabilities publicly.

Neither Vivo (Telefônica Brasil) nor Zain Group holds any compliance certifications.

Neither company holds any compliance certifications.

Vivo (Telefônica Brasil) company has more subsidiaries worldwide compared to Zain Group company.

Vivo (Telefônica Brasil) company employs more people globally than Zain Group company, reflecting its scale as a Telecommunications.

Neither Vivo (Telefônica Brasil) nor Zain Group holds SOC 2 Type 1 certification.

Neither Vivo (Telefônica Brasil) nor Zain Group holds SOC 2 Type 2 certification.

Neither Vivo (Telefônica Brasil) nor Zain Group holds ISO 27001 certification.

Neither Vivo (Telefônica Brasil) nor Zain Group holds PCI DSS certification.

Neither Vivo (Telefônica Brasil) nor Zain Group holds HIPAA certification.

Neither Vivo (Telefônica Brasil) nor Zain Group holds GDPR certification.

Latest Global CVEs (Not Company-Specific)

Description

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.

Risk Information
cvss2
Base: 5.0
Severity: LOW
AV:N/AC:L/Au:N/C:N/I:N/A:P
cvss3
Base: 4.3
Severity: LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
cvss4
Base: 5.3
Severity: LOW
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/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

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.

Risk Information
cvss3
Base: 7.8
Severity: LOW
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
cvss4
Base: 8.4
Severity: LOW
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/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

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.

Risk Information
cvss3
Base: 7.8
Severity: LOW
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
cvss4
Base: 8.4
Severity: LOW
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/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

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.

Risk Information
cvss3
Base: 7.8
Severity: LOW
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
cvss4
Base: 8.4
Severity: LOW
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/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

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.

Risk Information
cvss3
Base: 7.8
Severity: LOW
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
cvss4
Base: 8.4
Severity: LOW
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/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