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7.5
HIGH CVSS 3.1
CVE-2023-38522
Apache Traffic Server: Incomplete field name check allows request smuggling
Description

Apache Traffic Server accepts characters that are not allowed for HTTP field names and forwards malformed requests to origin servers. This can be utilized for request smuggling and may also lead cache poisoning if the origin servers are vulnerable. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.10, from 9.0.0 through 9.2.4. Users are recommended to upgrade to version 8.1.11 or 9.2.5, which fixes the issue.

INFO

Published Date :

July 26, 2024, 10:15 a.m.

Last Modified :

Nov. 3, 2025, 10:16 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Affected Products

The following products are affected by CVE-2023-38522 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 Apache traffic_server
: 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 HIGH [email protected]
CVSS 3.1 HIGH 134c704f-9b21-4f2e-91b3-4a467353bcc0
Solution
Upgrade Apache Traffic Server to a version that addresses the HTTP field name validation issue.
  • Upgrade to Apache Traffic Server version 8.1.11 or 9.2.5 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-2023-38522.

URL Resource
https://lists.apache.org/thread/c4mcmpblgl8kkmyt56t23543gp8v56m0 Mailing List Vendor Advisory
https://lists.apache.org/thread/c4mcmpblgl8kkmyt56t23543gp8v56m0 Mailing List Vendor Advisory
https://lists.debian.org/debian-lts-announce/2024/09/msg00040.html
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2023-38522 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-2023-38522 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-2023-38522 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-2023-38522 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 Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 03, 2025

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2024/09/msg00040.html
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Sep. 19, 2025

    Action Type Old Value New Value
    Removed CWE CWE-86
  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://lists.apache.org/thread/c4mcmpblgl8kkmyt56t23543gp8v56m0
  • CVE Modified by [email protected]

    Aug. 13, 2024

    Action Type Old Value New Value
    Added CWE Apache Software Foundation CWE-444
    Removed CWE Apache Software Foundation CWE-20
  • Initial Analysis by [email protected]

    Aug. 12, 2024

    Action Type Old Value New Value
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
    Changed Reference Type https://lists.apache.org/thread/c4mcmpblgl8kkmyt56t23543gp8v56m0 No Types Assigned https://lists.apache.org/thread/c4mcmpblgl8kkmyt56t23543gp8v56m0 Mailing List, Vendor Advisory
    Added CWE NIST CWE-444
    Added CPE Configuration OR *cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:* versions from (including) 8.0.0 up to (excluding) 8.1.11 *cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:* versions from (including) 9.0.0 up to (excluding) 9.2.5
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Aug. 01, 2024

    Action Type Old Value New Value
    Added CWE CISA-ADP CWE-86
    Added CVSS V3.1 CISA-ADP AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
  • CVE Received by [email protected]

    Jul. 26, 2024

    Action Type Old Value New Value
    Added Description Apache Traffic Server accepts characters that are not allowed for HTTP field names and forwards malformed requests to origin servers. This can be utilized for request smuggling and may also lead cache poisoning if the origin servers are vulnerable. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.10, from 9.0.0 through 9.2.4. Users are recommended to upgrade to version 8.1.11 or 9.2.5, which fixes the issue.
    Added Reference Apache Software Foundation https://lists.apache.org/thread/c4mcmpblgl8kkmyt56t23543gp8v56m0 [No types assigned]
    Added CWE Apache Software Foundation CWE-20
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: 7.5
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact