CVE-2025-55702
Apache Traffic Server: An unread Expect: 100-continue request body is framed as a new request
Description
When a client sends a POST with Expect: 100-continue and the origin answers before reading the body, Apache Traffic Server parses the unread body left on the client connection as the next request. An attacker behind a front-end proxy that shares connections to Traffic Server can use this to smuggle requests past the front end and desynchronize responses for other users. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0. Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.
INFO
Published Date :
Oct. 21, 2026, 7:16 p.m.
Last Modified :
Oct. 28, 2026, 2:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | f0158376-9dc2-43b6-827c-5f631a4d8d09 | ||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | f0158376-9dc2-43b6-827c-5f631a4d8d09 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Upgrade Apache Traffic Server to version 9.2.16 or later.
- Upgrade Apache Traffic Server to version 10.1.5 or later.
- Upgrade Apache Traffic Server to version 10.2.1 or later.
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-2025-55702.
| URL | Resource |
|---|---|
| https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-55702 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-2025-55702
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-2025-55702 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-55702 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.
-
CVE Translated by [email protected]
Oct. 28, 2026
Action Type Old Value New Value Added Translation Title: Apache Traffic Server de Apache Software Foundation, Description: Cuando un cliente envía un POST con?Expect:?100-continue y el origen responde antes de leer el cuerpo, Apache Traffic Server interpreta el cuerpo no leído que queda en la conexión del cliente como la siguiente solicitud. Un atacante detrás de un proxy front-end que comparte conexiones con Traffic Server puede usar esto para infiltrar solicitudes más allá del front?end y desincronizar respuestas para otros usuarios.\n\nEste problema afecta a Apache Traffic Server: desde la versión?8.0.0 hasta la?8.1.11 incluida, desde la versión?9.0.0 hasta la?9.2.15 incluida, desde la versión?10.0.0 hasta la?10.1.4 incluida y la versión?10.2.0.\n\nSe recomienda a los usuarios actualizar a la versión?9.2.16,?10.1.5?o?10.2.1, que corrigen el problema. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 23, 2026
Action Type Old Value New Value Removed SSVC {'id': 'CVE-2025-55702', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-10-21T00:00:00+00:00'} Added SSVC {'id': 'CVE-2025-55702', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-10-22T23:05:04.402377Z'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 22, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2025-55702', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-10-21T00:00:00+00:00'} -
New CVE Received by [email protected]
Oct. 21, 2026
Action Type Old Value New Value Added Description When a client sends a POST with Expect: 100-continue and the origin answers before reading the body, Apache Traffic Server parses the unread body left on the client connection as the next request. An attacker behind a front-end proxy that shares connections to Traffic Server can use this to smuggle requests past the front end and desynchronize responses for other users. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0. Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N Added CWE CWE-444 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2025/55xxx/CVE-2025-55702.json">CVE-2025-55702</a> Added Reference https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc