CVE-2024-53868Public exploitNetwork attack vector

Request smuggling via lenient chunk line parsing

Published Apr 3, 2025 · Updated Apr 18, 2025

HTTP request smuggling in Apache Traffic Server 9.2.0 through 9.2.9 and 10.0.0 through 10.0.4 allows remote attackers to bypass proxy controls. The chunked-body parser treats a lone LF in a chunk extension as a line terminator rather than rejecting the malformed request. Exploitation requires a downstream server that interprets the same bytes differently; smuggled requests can bypass front-end access controls.

CVSS severity7.5
High
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTTP request smuggling in Apache Traffic Server 9.2.0 through 9.2.9 and 10.0.0 through 10.0.4 allows remote attackers to bypass proxy controls. The chunked-body parser treats a lone LF in a chunk extension as a line terminator rather than rejecting the malformed request. Exploitation requires a downstream server that interprets the same bytes differently; smuggled requests can bypass front-end access controls.

The record

CVE
CVE-2024-53868
Published
Apr 3, 2025
Updated
Apr 18, 2025
Vendor
The Apache Software Foundation
Product
Apache Traffic Server
Classifications
CWE-444, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 18, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.0 <=10.0.4
  2. Affected versionversion=9.2.0 <=9.2.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Traffic Serverversion=10.0.0 <=10.0.4; version=9.2.0 <=9.2.9

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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