CVE-2022-47185Public exploitNetwork attack vector

Proxy crash via invalid cached-object Range header

Published Aug 9, 2023 · Updated Feb 13, 2025

Improper Range-header validation in Apache Traffic Server 9.2.1 and earlier allows remote attackers to crash the proxy via a cached object. When an invalid descending byte range targets a cached response, build_response_from_cache incorrectly repeats DNS handling after a successful lookup, leaving the state machine without a valid continuation. Range caching must be enabled and the requested object must already be cached; exploitation interrupts the proxy process without affecting data confidentiality or integrity.

CVSS severity7.5
High
EPSS probability2.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper Range-header validation in Apache Traffic Server 9.2.1 and earlier allows remote attackers to crash the proxy via a cached object. When an invalid descending byte range targets a cached response, build_response_from_cache incorrectly repeats DNS handling after a successful lookup, leaving the state machine without a valid continuation. Range caching must be enabled and the requested object must already be cached; exploitation interrupts the proxy process without affecting data confidentiality or integrity.

The record

CVE
CVE-2022-47185
Published
Aug 9, 2023
Updated
Feb 13, 2025
Vendor
The Apache Software Foundation
Product
Apache Traffic Server
Classifications
CWE-20, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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=0 <=9.2.1
  2. Affected versionversion=8.0.0 <=8.1.7
  3. Affected versionversion=9.0.0 <=9.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Traffic Serverversion=0 <=9.2.1; version=8.0.0 <=8.1.7; version=9.0.0 <=9.2.1

Published CVSS scores

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

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 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-20Improper Input Validation
T1499Endpoint Denial of Service

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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