CVE-2025-53094
ESPAsyncWebServer is an asynchronous HTTP and WebSocket server library for ESP32, ESP8266, RP2040 and RP2350. In versions up to and including 3.7.8, a CRLF (Carriage Return Line Feed) injection vulnerability exists in the construction and output of HTTP headers within `AsyncWebHeader.cpp`. Unsanitized input allows attackers to inject CR (`\r`) or LF (`\n`) characters into header names or values, leading to arbitrary header or response manipulation. Manipulation of HTTP headers and responses can enable a wide range of attacks, making the severity of this vulnerability high. A fix is available at pull request 211 and is expected to be part of version 3.7.9.
Scoring
- Severity
- HIGH
- CVSS base score
- 8.7
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- EPSS probability
- 0.38%
- CWE
- CWE-93, CWE-113
- Published
- 2025-06-27
- Last modified
- 2026-03-13
Affected products
- ESP32Async ESPAsyncWebServer
Weakness type
Related vulnerabilities
- CVE-2026-48019 — CRLF injection in Laravel's default email rule enables SMTP smuggling and spoofed-mail relay
- CVE-2026-75925 — IXON VPN Client CRLF Injection
- CVE-2026-84962 — Authenticated KMS request forgery via CRLF injection in GCP key identifier strings
- CVE-2026-84379 — HTTPX2: Multipart part header injection via unvalidated file Content-Type and custom headers
- CVE-2026-84372 — Predis: Redis command injection and denial of service via CRLF smuggling in pipelined commands on aggregate connections
- CVE-2026-82854 — Nodemailer before 8.0.3 SMTP Command Injection via envelope.size
- CVE-2026-82853 — Nodemailer before 8.0.5 SMTP Command Injection via CRLF
- CVE-2026-82661 — Nodemailer CRLF Injection via List-* Header Comments