PT-2025-27254 · Unknown · Espasyncwebserver

Jlleitschuh · Published 2025-06-27 · Updated 2025-06-28 · CVE-2025-53094

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions: ESPAsyncWebServer versions up to and including 3.7.8

Description: A CRLF injection vulnerability exists in the construction and output of HTTP headers within AsyncWebHeader.cpp. Unsanitized input allows attackers to inject CR (r) or LF ( ) characters into header names or values, leading to arbitrary header or response manipulation. This can enable a wide range of attacks.

Recommendations: For versions up to and including 3.7.8, apply the fix available at pull request 211, which is expected to be part of version 3.7.9. As a temporary workaround, consider restricting the input to AsyncWebHeader.cpp to prevent CR and LF character injections until the patch is applied.

Exploit

Fix

Weakness Enumeration

CWE-113

CWE-93

Related Identifiers

BDU:2025-15912

CVE-2025-53094

GHSA-87J8-6F7G-H8WH

Affected Products

Espasyncwebserver

References · 11

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/53xxx/CVE-2025-53094.json · Exploit
• https://osv.dev/vulnerability/CVE-2025-53094 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-15912 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-53094 · Security Note
• https://github.com/ESP32Async/ESPAsyncWebServer/security/advisories/GHSA-87j8-6f7g-h8wh · Note
• https://github.com/ESP32Async/ESPAsyncWebServer/pull/211 · Note
• https://github.com/ESP32Async/ESPAsyncWebServer/blob/1095dfd1ecf1a903aede29854232af1b24f089b1/src/AsyncWebHeader.cpp#L6-L32 · Note
• https://t.me/cvetracker/27271 · Telegram Post
• https://twitter.com/CVEnew/status/1938693139088183334 · Twitter Post
• https://twitter.com/VulmonFeeds/status/1938860842780340487 · Twitter Post
• https://twitter.com/CveFindCom/status/1938691258655871029 · Twitter Post