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    CVE-2021-23400

    The package nodemailer before 6.6.1 are vulnerable to HTTP Header Injection if unsanitized user input that may contain newlines and carriage returns is passed into an address object.

    Published:Jun 29, 2021
    Last Modified:Nov 21, 2024
    EPS:Jun 29, 2021
    EPSS Score:0.00536
    CVSS Score:6.3

    Affected Products

    Vendor
    Nodemailer
    Product
    Nodemailer

    Exploits

    https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1314737https://snyk.io/vuln/SNYK-JS-NODEMAILER-1296415https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1314737https://snyk.io/vuln/SNYK-JS-NODEMAILER-1296415

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-101 Server Side Include (SSI) Injection
    CAPEC-105 HTTP Request Splitting
    CAPEC-108 Command Line Execution through SQL Injection
    CAPEC-120 Double Encoding
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-135 Format String Injection
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-250 XML Injection
    CAPEC-267 Leverage Alternate Encoding
    CAPEC-273 HTTP Response Smuggling
    CAPEC-28 Fuzzing
    CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
    CAPEC-34 HTTP Response Splitting
    CAPEC-42 MIME Conversion
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-51 Poison Web Service Registry
    CAPEC-52 Embedding NULL Bytes
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-6 Argument Injection
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-7 Blind SQL Injection
    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic
    CAPEC-72 URL Encoding
    CAPEC-76 Manipulating Web Input to File System Calls
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic
    CAPEC-83 XPath Injection
    CAPEC-84 XQuery Injection
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities

    Related CVEs

    CVE-2026-82854 (CVSS 9.3) — Nodemailer before 8.0.4 is vulnerable to SMTP command injection through the unsanitized envelope.size paramete…
    CVE-2026-82853 (CVSS 6.9) — Nodemailer versions before 8.0.5 contain an SMTP command injection vulnerability in the transport name option …
    CVE-2026-82662 (CVSS 8.3) — Nodemailer before 8.0.8 disables TLS certificate verification in lib/fetch/index.js through rejectUnauthorized…
    CVE-2026-82661 (CVSS 5.3) — Nodemailer before 8.0.9 fails to sanitize carriage return and line feed characters in list comment fields, all…
    CVE-2026-82660 (CVSS 5.3) — Nodemailer before 8.0.9 fails to enforce disableFileAccess and disableUrlAccess options during message normali…
    CVE-2026-82659 (CVSS 7.1) — nodemailer before 9.0.1 fails to apply disableFileAccess and disableUrlAccess flags to message-level raw optio…
    CVE-2024-58379 (CVSS 6.9) — nodemailer before 6.9.9 contains a regular expression denial of service vulnerability in email parsing when at…
    CVE-2025-14874 (CVSS 7.5) — A flaw was found in Nodemailer. This vulnerability allows a denial of service (DoS) via a crafted email addres…
    CVE-2020-7769 (CVSS 8.6) — This affects the package nodemailer before 6.4.16. Use of crafted recipient email addresses may result in arbi…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High