CVE-2024-38479Network attack vector

Cache poisoning via omitted URL matrix parameters

Published Nov 14, 2024 · Updated Nov 3, 2025

Improper input validation in Apache Traffic Server 8.0.0 through 8.1.11 and 9.0.0 through 9.2.5 allows remote attackers to poison cached content. The cachekey plugin builds cache keys from the URI path and query but omits semicolon-delimited matrix parameters, causing distinct requests to share a cache entry. Exploitation requires the cachekey plugin on a caching proxy and lets unauthenticated network requests seed content that later requests receive.

CVSS severity7.5
High
EPSS probability0.82%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Apache Traffic Server 8.0.0 through 8.1.11 and 9.0.0 through 9.2.5 allows remote attackers to poison cached content. The cachekey plugin builds cache keys from the URI path and query but omits semicolon-delimited matrix parameters, causing distinct requests to share a cache entry. Exploitation requires the cachekey plugin on a caching proxy and lets unauthenticated network requests seed content that later requests receive.

The record

CVE
CVE-2024-38479
Published
Nov 14, 2024
Updated
Nov 3, 2025
Vendor
The Apache Software Foundation
Product
Apache Traffic Server
Classifications
CWE-20, T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 14, 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 <=8.1.11
  2. Affected versionversion=9.0.0 <=9.2.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Traffic Serverversion=8.0.0 <=8.1.11; version=9.0.0 <=9.2.5

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.

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No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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