CWE-1125: Excessive Attack Surface

Extended Description

Originating from software security, an "attack surface" measure typically reflects the number of input points and output points that can be utilized by an untrusted party, i.e. a potential attacker. A larger attack surface provides more places to attack, and more opportunities for developers to introduce weaknesses. In some cases, this measure may reflect other aspects of quality besides security; e.g., a product with many inputs and outputs may require a large number of tests in order to improve code coverage.

Source-backed guidance

Additional facts reviewed against primary or authoritative security sources.

Detect imprecise mappings involving CWE-1125

Review mappings to CWE-1125, Excessive Attack Surface, with MITRE's mapping and navigation criteria. Flag any selection that points to a View or Category, remains at a higher abstraction than the available evidence supports, or ignores relevant parent, child, peer, and alternative entries. Treat those findings as mapping-quality defects, correct them before publication, and retain the comparison trail for repeatable audits.

CWE Mapping and Navigation Guidance — MITRE CWE

Prevent CWE-1125 through an SSDF control plan

Use NIST SSDF practices to make prevention of CWE-1125, Excessive Attack Surface, an explicit development outcome. Translate the CWE definition into security requirements and design constraints, choose safer implementation patterns and toolchain checks, and define acceptance evidence before release. Feed every confirmed occurrence back into the requirements, design review, and coding rules so the same root cause is removed across the product rather than patched in one location.

NIST SP 800-218 Secure Software Development Framework — National Institute of Standards and Technology

Triage CWE-1125 against known exploitation evidence

Use CISA's Known Exploited Vulnerabilities catalog to test whether a vulnerability mapped to CWE-1125, Excessive Attack Surface, has evidence of exploitation in the wild. Confirm the CVE-to-CWE root-cause mapping independently before attaching the example, then capture the affected product, required action, and remediation deadline. A missing KEV match is not evidence that the weakness is unexploited, and a KEV entry must not be generalized to every occurrence of this CWE.

Known Exploited Vulnerabilities Catalog — Cybersecurity and Infrastructure Security Agency

Use MITRE taxonomy anchors to review Excessive Attack Surface

Recorded impacts include Varies by Context; related weaknesses include CWE-1120. Use these source-defined anchors to turn CWE-1125 into implementation, review, and verification checks for the affected component.

CWE-1125: Excessive Attack Surface — MITRE CWE

Validate CWE-1125 with root-cause mapping checks

Apply MITRE's root-cause mapping quick tips to CWE-1125, Excessive Attack Surface. Confirm the finding describes the causal weakness rather than an impact or attack pattern, compare the abstraction and mapping notes with plausible alternatives, and have a second reviewer challenge the selection. Preserve the evidence and reasoning so recurring defects can be measured against one consistent identifier.

CVE to CWE Root Cause Mapping Quick Tips — MITRE CWE

Frequently Asked Questions

What is CWE-1125: Excessive Attack Surface?+

CWE-1125: Excessive Attack Surface is a Common Weakness Enumeration (CWE) entry maintained by MITRE. The product has an attack surface whose quantitative measurement exceeds a desirable maximum. Originating from software security, an "attack surface" measure typically reflects the number of input points and output points that can be utilized by an untrusted party, i.e. a potential attacker. A larger attack surface provides more places to attack, and more opportunities for developers to introduce weaknesses. In some cases, this measure may reflect other aspects of quality besides security; e.g., a product with many inputs and outputs may require a large number of tests in order to improve code coverage.

What are the security consequences of Excessive Attack Surface?+

If exploited, CWE-1125 (Excessive Attack Surface) it can compromise Other, leading to outcomes such as Varies by Context.

Which programming languages are affected by Excessive Attack Surface?+

CWE-1125 commonly affects Not Language-Specific. Note that weaknesses are often language-agnostic patterns, so secure coding practices apply broadly.

What is the difference between a CWE and a CVE?+

A CWE (Common Weakness Enumeration) like CWE-1125 describes a category of software weakness — the underlying flaw type. A CVE (Common Vulnerabilities and Exposures) identifies a specific, real-world vulnerability in a particular product. In short, a CWE is the kind of mistake, and a CVE is an instance of that mistake being found in software.

CWE-1125: Excessive Attack Surface

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