CRLF Injection Affecting ESP32Async/ESPAsyncWebServer package, versions [,3.7.9)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-ESP32ASYNCESPASYNCWEBSERVER-10645530
- published7 Jul 2025
- disclosed27 Jun 2025
- creditJonathan Leitschuh
Introduced: 27 Jun 2025
CVE-2025-53094 (opens in a new tab)How to fix?
Upgrade ESP32Async/ESPAsyncWebServer to version 3.7.9 or higher.
Overview
Affected versions of this package are vulnerable to CRLF Injection via the AsyncWebHeader function. An attacker can manipulate HTTP headers or responses by injecting CR (\r) or LF (\n) characters into header names or values.