CVE-2024-25111VulnerabilityPublished 16 Apr 2024Updated 26 Jun 2026

Red Hat Security Advisory: squid:4 security update

Affects Red HatSource GCVE Database

Mentioned vulnerabilities

CVE-2024-25617

Authoritative record:CVE-2024-25111· High 8.6

Not known to be exploited · 65% EPSS · CVSS 8.6 High : upgrade to 6.8 as a priority.

Data as of 26 Oct 2026, 07:57 UTC

CVSS base score

8.6High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 65.2% chance of exploitation in 30 days – higher than 99% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 6.8

Exploitation evidence

Disclosed: evidence found.
CVE published 6 Mar 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade squid-cache/squid to 6.8.

Affected software

Product	Affected	Fixed in
GitHubsquid-cache/squid`pkg:github/squid-cache/squid`Other threats	Affected <6.8 >=3.5.27	Fixed in 6.8

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Red Hat has released updated squid:4 packages for Red Hat Enterprise Linux 8.4 variants that fix these vulnerabilities. Users should apply the update as detailed in the Red Hat advisory RHSA-2024:1832 (https://access.redhat.com/articles/11258). The update will automatically restart the squid service. Applying this official fix is the recommended mitigation.

Description

Squid is a high-performance proxy caching server for web clients, supporting FTP, and HTTP data objects. Security Fix(es): * squid: Denial of Service in HTTP Chunked Decoding (CVE-2024-25111) * squid: denial of service in HTTP header parser (CVE-2024-25617) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Impact

Successful exploitation of these vulnerabilities could result in denial of service conditions, causing the squid proxy server to crash or become unresponsive, thereby disrupting web proxy services. No information is provided about code execution or data compromise. No known exploits in the wild have been reported at this time.

Summary

This advisory covers two denial of service vulnerabilities in squid:4, a high-performance proxy caching server. CVE-2024-25111 involves a denial of service in HTTP chunked decoding, while CVE-2024-25617 involves a denial of service in the HTTP header parser. Both issues could cause the squid service to crash or become unresponsive. Red Hat has released updated packages for Red Hat Enterprise Linux 8.4 variants to address these vulnerabilities. The advisory references Red Hat's errata RHSA-2024:1832 and provides instructions for applying the update, which includes an automatic restart of the squid service.

CWE-674Uncontrolled Recursion (opens in a new tab)
Class weakness
The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.
Implementation
Ensure that an end condition will be reached under all logic conditions. The end condition may include checking against the depth of recursion and exiting with an error if the recursion goes too deep. The complexity of the end condition contributes to the effectiveness of this action.
Implementation
Increase the stack size.
Attack patterns
Serialized Data with Nested Payloads (opens in a new tab)
Oversized Serialized Data Payloads (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-182Collapse of Data into Unsafe Value (opens in a new tab)
Base weakness
The product filters data in a way that causes it to be reduced or "collapsed" into an unsafe value that violates an expected security property.
Architecture and Design · Input Validation
Avoid making decisions based on names of resources (e.g. files) if those resources can have alternate names.
Implementation · Input Validation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
Implementation · Input Validation
Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174).
OWASP Cheat Sheets
Abuse Case (opens in a new tab)
Deserialization (opens in a new tab)
OWASP ASVS 4.0.3
V1.5.1 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Jun 2026, 13:41 UTC

WeaknessesCWE-674, CWE-182

Technical details

References

Community reviews

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