CVE-2024-25111VulnerabilityPublished 9 May 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 4.4-8 as a priority.

Data as of 26 Oct 2026, 06:26 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 4.4-8

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 redhat/squid to 4.4-8.

Affected software

Product	Affected	Fixed in
Red Hatredhat/squid`pkg:rpm/redhat/squid`Other threats	Affected <4.4-8	Fixed in 4.4-8

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 an official security update for Squid 4 on Red Hat Enterprise Linux 8.2 variants that addresses these denial of service vulnerabilities. Users should apply the update as described in the Red Hat advisory (RHSA-2024:2777) available at https://access.redhat.com/articles/11258. The update will automatically restart the squid service. No additional mitigation steps are indicated by the vendor.

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 header parser (CVE-2024-25617) * squid: Denial of Service in HTTP Chunked Decoding (CVE-2024-25111) 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 cause denial of service conditions in the Squid proxy server, potentially disrupting proxy services for clients relying on it. There is no indication of code execution or data compromise. No known exploits in the wild have been reported at this time.

Summary

Red Hat Product Security released an advisory (RHSA-2024:2777) addressing two denial of service vulnerabilities in Squid 4: CVE-2024-25617 affecting the HTTP header parser and CVE-2024-25111 affecting HTTP chunked decoding. These vulnerabilities could allow an attacker to cause a denial of service condition. The advisory covers Red Hat Enterprise Linux 8.2 variants including AUS, TUS, and SAP Update Services for x86_64 and ppc64le architectures. The update is rated as Important by Red Hat and includes patches that fix these issues. After applying the update, the squid service will be restarted automatically. No CVSS scores are provided in the advisory.

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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