CWE-553: Command Shell in Externally Accessible Directory

Source-backed guidance

Additional facts reviewed against primary or authoritative security sources.

Verify controls for CWE-553 with SSDF evidence

Use NIST SSDF verification and vulnerability-response practices to detect CWE-553, Command Shell in Externally Accessible Directory, throughout the product lifecycle. Derive review questions, static or dynamic checks, and negative tests from the CWE's causal behavior; define the components and lifecycle stages each check covers; and retain findings with enough evidence to distinguish the root cause from symptoms and impacts. Track escapes and false negatives, then improve the verification plan after every confirmed occurrence.

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

Address Command Shell in Externally Accessible Directory during Installation

MITRE associates mitigation with Installation, and System Configuration; recorded impacts include Execute Unauthorized Code or Commands; the entry maps to CAPEC-650. Use these source-defined anchors to turn CWE-553 into implementation, review, and verification checks for the affected component.

CWE-553: Command Shell in Externally Accessible Directory — MITRE CWE

Triage CWE-553 against known exploitation evidence

Use CISA's Known Exploited Vulnerabilities catalog to test whether a vulnerability mapped to CWE-553, Command Shell in Externally Accessible Directory, 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

Apply precise root-cause mapping to CWE-553

Apply MITRE's full root-cause mapping guidance when using CWE-553, Command Shell in Externally Accessible Directory. Separate weakness language from attacker prerequisites and technical impact, check the entry's abstraction and vulnerability-mapping notes, and prefer the most specific Base or Variant supported by the evidence. Record the rejected alternatives and require an independent review before the mapping is used for remediation trends or program metrics.

CVE to CWE Root Cause Mapping Guidance — MITRE CWE

Validate CWE-553 with root-cause mapping checks

Apply MITRE's root-cause mapping quick tips to CWE-553, Command Shell in Externally Accessible Directory. 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-553: Command Shell in Externally Accessible Directory?+

CWE-553: Command Shell in Externally Accessible Directory is a Common Weakness Enumeration (CWE) entry maintained by MITRE. A possible shell file exists in /cgi-bin/ or other accessible directories. This is extremely dangerous and can be used by an attacker to execute commands on the web server.

What are the security consequences of Command Shell in Externally Accessible Directory?+

If exploited, CWE-553 (Command Shell in Externally Accessible Directory) it can compromise Confidentiality, Integrity and Availability, leading to outcomes such as Execute Unauthorized Code or Commands.

How do you prevent or mitigate Command Shell in Externally Accessible Directory?+

Recommended mitigations for CWE-553 include: Remove any Shells accessible under the web root folder and children directories.

Which programming languages are affected by Command Shell in Externally Accessible Directory?+

CWE-553 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-553 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-553: Command Shell in Externally Accessible Directory

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