What is attack surface management (ASM)?
Glossary
The short answer |
|---|
Attack surface management (ASM) is the continuous discovery, inventory, classification and monitoring of all the assets an attacker could target, such as domains, IP addresses, web apps, APIs, cloud services and exposed credentials. It works from the outside in, the way an attacker would, so it finds unknown or forgotten assets as well as known ones and flags the exposures that matter. |
How does attack surface management work?
Discover: start from a company name or root domain and find related domains, subdomains, IP ranges, certificates and cloud assets using public data.
Inventory: build a list of every exposed asset and who owns it.
Assess: check each asset for open services, outdated software, misconfigurations and leaked secrets.
Prioritize: rank exposures by how easy they are to exploit and how sensitive the asset is.
Monitor: repeat continuously and alert when something new appears or changes.
Why does attack surface management matter for startups?
Startups move fast and leave things behind: a preview deployment, a marketing microsite on an old CMS, a staging database with real data, a test API with no authentication. Attackers scan the internet constantly and find these quickly. ASM gives a small team the same outside view an attacker has, without needing to know in advance where to look.
Common exposures ASM finds
Exposure | Why it matters |
|---|---|
Forgotten subdomains | Often run outdated, unpatched software |
Dangling DNS records | Can allow subdomain takeover |
Public storage buckets | Can leak customer data |
Exposed admin panels | Invite credential stuffing |
Expired or weak TLS | Breaks trust and can enable interception |
Secrets in public code | Grant direct access without any exploit |
How NexusVoid handles it
Argus, NexusVoid’s application security product, starts outside-in like an attacker, with no credentials or installs needed to begin. From that external view it works inward through code, dependencies, cloud and secrets. Findings are mapped to MITRE ATT&CK with attack paths, each one has an owner, and fixes arrive as pull requests.
Related terms
ASPM (application security posture management)
Vulnerability scanning
Penetration testing
MITRE ATT&CK
Continuous compliance
Frequently asked questions
What is the difference between ASM and EASM?
Attack surface management covers every way into your organization, including internal systems, identities and code. External attack surface management (EASM) focuses on the part reachable from the public internet: domains, subdomains, IP addresses, web apps, APIs and cloud services. For most startups, the external surface is where attacks begin, so EASM is usually the first piece to put in place.
How is ASM different from vulnerability scanning?
A vulnerability scanner checks targets you already know about. ASM first works out what your targets are, including assets nobody listed, such as an old staging site or a forgotten cloud bucket, then checks them. Discovery is the defining step. An asset you do not know about will never appear in a scan schedule.
What does an attack surface usually include?
Typical items are domains and subdomains, public IP addresses, websites and web apps, APIs, login pages, cloud storage, exposed databases or admin panels, code repositories, TLS certificates and third-party services that hold your data. Leaked credentials and secrets in public code also count, because they give attackers a way in without exploiting any software flaw.
How often should a startup review its attack surface?
Continuously if possible, and at least weekly. Startups add subdomains, preview environments and SaaS tools constantly, and each one can expose something new. Automated discovery that runs every day catches a forgotten test server or newly public bucket within hours rather than months, which is the window that matters.
Curious what your company looks like from the outside? Book a call at /contact and we will show you.
Something wrong in this post? Tell us at lakshay@nexusvoidai.com and we will fix it and say so.
More terms
ASPM
ASPM pulls the findings from all your application security tools into one prioritized view, so a small team fixes the risks that matter first.
Autonomous CISO
An autonomous CISO is software that runs the day-to-day work of a security program, so startups get continuous security, with compliance following from it.
Compliance automation
Compliance automation replaces spreadsheets and screenshots with software that maps controls, collects evidence and tracks readiness for frameworks like SOC 2.
Start with a real security program.
Tell us what you need to fix first and we will show that part live, on a stack like yours.