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4.8
MEDIUM CVSS 3.1
CVE-2025-66373
Akamai CDN HTTP Request Smuggling Vulnerability
Description

Akamai Ghost on Akamai CDN edge servers before 2025-11-17 has a chunked request body processing error that can result in HTTP request smuggling. When Akamai Ghost receives an invalid chunked body that includes a chunk size different from the actual size of the following chunk data, under certain circumstances, Akamai Ghost erroneously forwards the invalid request and subsequent superfluous bytes to the origin server. An attacker could hide a smuggled request in these superfluous bytes. Whether this is exploitable depends on the origin server's behavior and how it processes the invalid request it receives from Akamai Ghost.

INFO

Published Date :

Dec. 4, 2025, 5:15 p.m.

Last Modified :

Dec. 16, 2025, 8:58 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Affected Products

The following products are affected by CVE-2025-66373 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Akamai akamaighost
: Total Affected Vendor : 1 | Products : 1
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM 134c704f-9b21-4f2e-91b3-4a467353bcc0
Solution
Address invalid chunked body processing errors to prevent HTTP request smuggling.
  • Update Akamai Ghost on edge servers.
  • Configure origin server request handling.
  • Implement input validation for chunked bodies.
  • Monitor network traffic for anomalies.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-66373.

URL Resource
https://en.wikipedia.org/wiki/HTTP_request_smuggling Technical Description
https://www.akamai.com/blog/security/cve-2025-66373-http-request-smuggling-chunked-body-size Vendor Advisory Mitigation
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-66373 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-66373 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-66373 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-66373 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Dec. 16, 2025

    Action Type Old Value New Value
    Added CPE Configuration OR *cpe:2.3:a:akamai:akamaighost:*:*:*:*:*:*:*:* versions up to (excluding) 2025-11-17
    Added Reference Type MITRE: https://en.wikipedia.org/wiki/HTTP_request_smuggling Types: Technical Description
    Added Reference Type MITRE: https://www.akamai.com/blog/security/cve-2025-66373-http-request-smuggling-chunked-body-size Types: Mitigation, Vendor Advisory
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Dec. 08, 2025

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
    Added CWE CWE-444
  • New CVE Received by [email protected]

    Dec. 04, 2025

    Action Type Old Value New Value
    Added Description Akamai Ghost on Akamai CDN edge servers before 2025-11-17 has a chunked request body processing error that can result in HTTP request smuggling. When Akamai Ghost receives an invalid chunked body that includes a chunk size different from the actual size of the following chunk data, under certain circumstances, Akamai Ghost erroneously forwards the invalid request and subsequent superfluous bytes to the origin server. An attacker could hide a smuggled request in these superfluous bytes. Whether this is exploitable depends on the origin server's behavior and how it processes the invalid request it receives from Akamai Ghost.
    Added Reference https://en.wikipedia.org/wiki/HTTP_request_smuggling
    Added Reference https://www.akamai.com/blog/security/cve-2025-66373-http-request-smuggling-chunked-body-size
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 4.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact