Offensive security services, VAPT & penetration testing, Red team operations, Application & cloud security, ISO 27001 · SOC 2 · DPDP, Government & regulatory audits, Virtual CISO advisory
Hacked by us.Not by them.
We break in the way real attackers would — with your permission. Then we help you fix every finding and prove your security to auditors, regulators and customers.
- Hall of Fame recognitions
- CVE credits
- Manually validated findings
Trusted by
- Eros Group
- Serviz4u
- ACME
- Swartzchild Home
Who we are
We think like attackers.We report like auditors.
0DAY Security was built by a team that hacks for a living. Our researchers have earned Hall of Fame recognitions and CVE credits through responsible disclosure, and we bring that same attacker mindset to every engagement. We work with startups, enterprises and regulated institutions — and now with government and public sector bodies — to uncover real risk, fix it fast and meet the standards they’re measured against: ISO 27001, SOC 2, DPDP, and RBI, SEBI and IRDAI mandates.
See what we doServices
Seven ways we make youharder to hack.
From hands-on hacking to audit-ready compliance — choose one service, or combine them into a complete security program.
01 / 07
Vulnerability Assessment & Penetration Testing (VAPT)
Proof, not scanner noise.
Manual, attacker-grade testing of your networks, web and mobile apps, APIs and Wi-Fi. Every finding is manually validated, ranked by business risk and delivered with a clear fix.
Network Infrastructure Security Testing
Servers, firewalls and network devices tested for exploitable weaknesses.
Web Application Penetration Testing
In-depth manual testing for OWASP Top 10 and business-logic flaws.
API Security Testing
APIs checked for broken authentication, data exposure and abuse.
Mobile Application Security Testing
Android and iOS apps assessed, from on-device storage to backend APIs.
Wireless Security Testing
Wi-Fi networks tested for weak encryption, rogue access points and leaks.
Comprehensive Vulnerability Assessment & Management
Continuous scanning, prioritisation and tracking until every issue is closed.
02 / 07
Red Teaming & Attack Simulation
A real attack. Minus the damage.
A full-scale, objective-driven attack on your organisation — across people, processes and technology. Find out how far a real adversary would get, and how quickly your team would notice.
Real-world Adversary Simulation
Objective-driven attacks that mirror the tactics of real threat actors.
Attack Simulation & Threat Modeling
Map your likely attack paths, then test the scenarios that matter most.
Compromise Assessment
Hunt for signs that attackers are already inside your environment.
03 / 07
Application & Cloud Security
Secure code. Hardened cloud.
We review your code, test your applications and audit your AWS, Azure and GCP environments — closing design flaws and misconfigurations while they’re still cheap to fix.
Application Security Testing
Thorough testing of your applications across the development lifecycle.
Source Code Review (Manual + Automated)
Expert manual review, backed by tooling, to catch flaws scanners miss.
Secure Development Advisory
Practical guidance that helps your team ship secure code by default.
Cloud Security Assessments (AWS / Azure / GCP)
Configuration and architecture reviews against industry benchmarks.
04 / 07
Governance, Risk & Compliance (GRC)
Audit-ready, not audit-anxious.
ISO 27001, SOC 2, DPDP and RBI, SEBI and IRDAI requirements — turned into a clear, practical program. We take you from the first gap assessment to certification readiness, and keep you there.
ISO 27001 Readiness, Implementation & Audit Support
Gap analysis, ISMS implementation and hands-on support through your audit.
SOC 2 (Type 1 & Type 2) Readiness & Advisory
The right controls and evidence in place for a confident SOC 2 audit.
GDPR / DPDP Act (Data Protection) Compliance Advisory
Privacy programs aligned with GDPR and India’s DPDP Act, 2023.
Regulatory Compliance & Gap Assessment (RBI, SEBI, IRDAI etc.)
Meet the cybersecurity requirements set by your sector’s regulators.
Risk Assessment & Risk Management Framework
Identify, score and treat risks with a framework that grows with you.
Third-Party / Vendor Risk Assessment
Assess and monitor the security of the vendors you depend on.
Policy, Procedure & Documentation Development
Clear, audit-ready policies and procedures tailored to how you work.
Internal Audit & Continuous Compliance Support
Regular internal audits that keep you compliant all year round.
05 / 07
Government & Regulatory Security Audits
Security that stands up to scrutiny.
Independent security audits for government departments, PSUs and regulated institutions — covering citizen-facing portals, mission-critical applications and the infrastructure behind them, with formal reports aligned to CERT-In guidelines and regulator expectations.
Government Website & Portal Security Audits
Security audits of government websites, citizen portals and e-governance applications.
Network & Infrastructure Security Audits
In-depth audits of the networks, servers and data centres behind public services.
CERT-In Guidelines & Directions Compliance
Gap assessments against CERT-In directions and its security guidelines for government entities.
Regulatory Audit Readiness (RBI, SEBI, IRDAI)
Independent pre-audit assessments that prepare regulated entities for mandated cybersecurity audits.
Audit Reporting, Remediation & Closure
Formal audit reports, remediation guidance and verification of every fix through to closure.
06 / 07
Security Awareness & Training
Make your team hard to fool.
Engaging training and realistic phishing simulations that change behaviour — not just tick a compliance box. Your people learn to spot and report attacks, and you get the numbers to prove it’s working.
Employee Security Awareness Training
Engaging sessions that help every employee spot and stop threats.
Phishing Simulation Campaigns
Realistic phishing tests that measure and reduce risky clicks over time.
Corporate Cybersecurity Training Programs
Role-based programs for technical teams, managers and leadership.
07 / 07
Virtual CISO (vCISO) & Advisory
A CISO’s judgement. Without the full-time cost.
Senior security leadership, sized to your needs. We set your strategy, build your roadmap, mature your security program and brief your board in plain business language.
Ongoing Security Strategy & Roadmap
A clear, prioritised roadmap aligned with your business goals.
Security Program Development & Maturity Improvement
Build and mature your security program, one measurable step at a time.
Board & Leadership Level Security Advisory
Jargon-free security guidance for your board and leadership team.
How we work
Four steps. Zero guesswork.From first call to verified fix.
Scope
A free call to understand your business, your systems and what’s at stake. We agree on objectives, boundaries and rules of engagement in writing — before any work begins.
Attack & Assess
Hands-on testing, code review or compliance gap analysis — depending on the engagement. Every finding is manually validated, so nothing reaches your report unverified.
Report
A clear, prioritised report: an executive summary your leadership can act on, plus technical detail and step-by-step fixes your engineers can use right away.
Fix & Verify
We support your team through remediation, retest every fix and stay with you through audits, renewals and whatever comes next.
Why 0DAY Security
Proof over promises.
Real hackers. Verified findings.
Every engagement is led by hands-on offensive security specialists, and every finding is manually validated — never a raw scanner export.
A public track record
Hall of Fame recognitions and CVE credits from responsible disclosure. Our research is on the public record, not just on our website.
Offence and compliance, one team
The people who find your gaps also get you audit-ready for ISO 27001, SOC 2, DPDP and sector regulators. No hand-offs, no lost context.
Proven methodology
OWASP and PTES for testing. ISO 27001 and SOC 2 for compliance. Repeatable results you can defend in front of auditors and your board.
Reports leaders actually read
Plain-language executive summaries, backed by the technical detail and step-by-step fixes your engineers need.
Engagements that fit you
A one-time assessment, an ongoing retainer or a long-term vCISO partnership. Scale up or down as your needs change.
FAQ
Straight answers to the questions we hear most often.
What’s the difference between VAPT and red teaming?
VAPT aims to find and validate as many vulnerabilities as possible within a defined scope, such as a web application, an API or a network. Red teaming is objective-driven: we act like a real adversary to test how well your organisation detects, responds to and recovers from an attack.
Will testing disrupt our systems?
Every engagement is planned with you in advance. We agree on scope, testing windows and any sensitive systems up front, and keep an open line of communication throughout, so testing stays safe and controlled.
How long does an engagement take?
It depends on scope. A focused web application or API test usually takes a few days, a red team operation can run for several weeks, and compliance programs are delivered in clear phases. You’ll get a realistic timeline during scoping.
Can you help us get ready for ISO 27001 or SOC 2?
Yes. We run the gap assessment, help you implement the right controls and policies, prepare your evidence and support you through the audit. The certificate or report itself is issued by an accredited certification body (ISO 27001) or an independent CPA firm (SOC 2) — our job is to make sure you walk in ready.
Do you help with RBI, SEBI, IRDAI and DPDP Act compliance?
Yes. We map your current controls against the regulatory requirements that apply to you, identify the gaps and help you close them — with clear documentation to back it up.
Do you work with government departments and PSUs?
Yes. We audit government websites, citizen portals, applications and infrastructure, and help departments and PSUs align with CERT-In guidelines. Share your audit requirements and we’ll scope an engagement that meets them.
What is a virtual CISO, and do we need one?
A virtual CISO gives you senior security leadership without a full-time hire. If you need a security strategy, a roadmap and someone to brief your board — but aren’t ready to hire a CISO — a vCISO is a cost-effective fit.
How do we get a quote?
Send us a few details through the quote form, or call or email us. Scoping is free, and we’ll come back with a proposal tailored to your environment.
Someone will test your defences.Make sure it’s us.
Start with a free scoping call. You’ll know exactly what we’d test, how long it would take and what it would cost — before you commit to anything.