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CVE-2025-53007— arduino-esp32 vulnerable to CRLF injection in WebServer.cpp

Quick assessment

Affected
espressif arduino-esp32
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

arduino-esp32是Espressif开源的一个用于 ESP32、ESP32-S2、ESP32-S3、ESP32-C3、ESP32-C6 和 ESP32-H2 的 Arduino 内核。 arduino-esp32 3.3.0-RC1和3.2.1之前版本存在注入漏洞，该漏洞源于sendHeader函数存在HTTP响应拆分漏洞。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.47% · P39

Possible ATT&CK Techniques 1 AI

T1071.004 · DNS
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I. Basic Information for CVE-2025-53007

Vulnerability Information
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Vulnerability Title
arduino-esp32 vulnerable to CRLF injection in WebServer.cpp
Source: CVE Program / CVE List V5
Vulnerability Description
arduino-esp32 provides an Arduino core for the ESP32. Versions prior to 3.3.0-RC1 and 3.2.1 contain a HTTP Response Splitting vulnerability. The `sendHeader` function takes arbitrary input for the HTTP header name and value, concatenates them into an HTTP header line, and appends this to the outgoing HTTP response headers. There is no validation or sanitization of the `name` or `value` parameters before they are included in the HTTP response. If an attacker can control the input to `sendHeader` (either directly or indirectly), they could inject carriage return (`\r`) or line feed (`\n`) characters into either the header name or value. This could allow the attacker to inject additional headers, manipulate the structure of the HTTP response, potentially inject an entire new HTTP response (HTTP Response Splitting), and/or ause header confusion or other HTTP protocol attacks. Versions 3.3.0-RC1 and 3.2.1 contain a fix for the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP头部中CRLF序列转义处理不恰当(HTTP响应分割)
Source: CVE Program / CVE List V5
Vulnerability Title
arduino-esp32 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
arduino-esp32是Espressif开源的一个用于 ESP32、ESP32-S2、ESP32-S3、ESP32-C3、ESP32-C6 和 ESP32-H2 的 Arduino 内核。 arduino-esp32 3.3.0-RC1和3.2.1之前版本存在注入漏洞，该漏洞源于sendHeader函数存在HTTP响应拆分漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
espressif arduino-esp32 < 3.2.1 -

II. Public POCs for CVE-2025-53007

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III. Intelligence Information for CVE-2025-53007

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Patches & Fixes for CVE-2025-53007 (3)

IV. Related Vulnerabilities

Same product: arduino-esp32
Same vendor: espressif
Same weakness: CWE-113

V. Comments for CVE-2025-53007

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