CVE-2024-35161Network attack vector

Request smuggling via malformed chunked trailer forwarding

Published Jul 26, 2024 · Updated Nov 3, 2025

HTTP request smuggling in Apache Traffic Server 8.0.0 through 8.1.10 and 9.0.0 through 9.2.4 allows remote attackers to alter origin requests. The HTTP parser accepts a malformed trailer section after the terminating chunk and forwards it unchanged, allowing the proxy and origin to disagree about request boundaries. Exploitation requires a reachable proxy and an origin that interprets the malformed bytes differently; a susceptible origin cache can also be poisoned.

CVSS severity7.5
High
EPSS probability0.97%
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 8.0.0 through 8.1.10 and 9.0.0 through 9.2.4 allows remote attackers to alter origin requests. The HTTP parser accepts a malformed trailer section after the terminating chunk and forwards it unchanged, allowing the proxy and origin to disagree about request boundaries. Exploitation requires a reachable proxy and an origin that interprets the malformed bytes differently; a susceptible origin cache can also be poisoned.

The record

CVE
CVE-2024-35161
Published
Jul 26, 2024
Updated
Nov 3, 2025
Vendor
The Apache Software Foundation
Product
Apache Traffic Server
Classifications
CWE-444, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 26, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 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=8.0.0 <=8.1.10
  2. Affected versionversion=9.0.0 <=9.2.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Traffic Serverversion=8.0.0 <=8.1.10; version=9.0.0 <=9.2.4

Published CVSS scores

7.5NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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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