CVE-2024-25111Public exploitNetwork attack vector

Service crash via recursive chunked-response processing

Published Mar 6, 2024 · Updated Nov 3, 2025

Uncontrolled recursion in Squid 3.5.27 through 6.7 allows remote attackers to crash the proxy via a crafted chunked HTTP response. When the reply buffer is full, HttpStateData::maybeMakeSpaceAvailable calls processReply again through processReplyBody and maybeReadVirginBody instead of ending the transaction. An attacker must induce the proxy to fetch from an attacker-controlled origin; the resulting stack overflow interrupts the Squid service.

CVSS severity8.6
High
EPSS probability65.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled recursion in Squid 3.5.27 through 6.7 allows remote attackers to crash the proxy via a crafted chunked HTTP response. When the reply buffer is full, HttpStateData::maybeMakeSpaceAvailable calls processReply again through processReplyBody and maybeReadVirginBody instead of ending the transaction. An attacker must induce the proxy to fetch from an attacker-controlled origin; the resulting stack overflow interrupts the Squid service.

The record

CVE
CVE-2024-25111
Published
Mar 6, 2024
Updated
Nov 3, 2025
Vendor
Fedora Project
Product
Fedora Linux
Classifications
CWE-674, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 6, 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=38
  2. Affected versionversion=39

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fedora Project · Fedora Linuxversion=38; version=39
NetApp · BlueXPversion=0 <*
The Squid Software Foundation · Squidversion=>= 3.5.27, < 6.8; version=3.5.27 <6.8

Published CVSS scores

8.6NetAppCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
8.6GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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.

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-674Uncontrolled Recursion
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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