CVE-2024-21536VulnerabilityPublished 15 Apr 2025Updated 25 Oct 2026

Red Hat Security Advisory: ACS 4.5 enhancement and security update

Affects Red HatSource GCVE Database

Mentioned vulnerabilities

Not known to be exploited : upgrade to 4.5.9 soon.

Data as of 25 Oct 2026, 22:09 UTC

Severity

High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 1.0% chance of exploitation in 30 days – higher than 63% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 4.5.9

Exploitation evidence

Disclosed: evidence found.
CVE published 15 Apr 2025
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 2026-10-25.

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 Red Hat to 4.5.9.

Affected software

Product	Affected	Fixed in
Red Hat Product Security Red Hat	Affected >=4.5.0 <4.5.9 Red Hat Red Hat Advanced Cluster Security for Kubernetes RHACS 4.5 for RHEL 8 ppc64le advanced-cluster-security/rhacs-central-db-rhel8@sha256:dda4781392cd2bb6e599f51b35b390e7d60d71166a968c358c999a570cbc829b_ppc64le	Fixed in 4.5.9

AI-suggested

Red Hat has released RHACS version 4.5.9 which includes fixes for these vulnerabilities. Users running versions >=4.5.0 and <4.5.9 are strongly advised to upgrade to 4.5.9 to remediate these security issues. No additional mitigation steps are indicated beyond applying the official patch release.

Description

This release of RHACS includes the following bug fix: * Fixed a bug to match the aggregation field of the compliance tables to the widgets for consistency. This release also addresses the following security vulnerabilities: * RHSA-2025:2679: libxml2 security update * RHSA-2025:1350: libxml2 security update * RHSA-2025:1330: openssl security update * CVE-2024-57083: Prototype pollution in redoc can allow a DoS attack * CVE-2024-21536: Flaw in `http-proxy-middleware` package * CVE-2025-30204: Flaw in the golang-jwt implementation of JSON Web Tokens (JWT)

Impact

The vulnerabilities can cause denial of service conditions or excessive memory consumption, potentially impacting the availability and stability of RHACS deployments. Prototype pollution in redoc (CVE-2024-57083) can be exploited to trigger a denial of service. The http-proxy-middleware flaw (CVE-2024-21536) also leads to denial of service. The golang-jwt vulnerability (CVE-2025-30204) allows excessive memory allocation during JWT header parsing, which may be leveraged to disrupt service. No known exploits in the wild have been reported at this time.

Summary

This Red Hat security advisory (RHSA-2025:3928) addresses several security vulnerabilities in Red Hat Advanced Cluster Security for Kubernetes (RHACS) 4.5. The vulnerabilities include CVE-2024-57083, a prototype pollution vulnerability in redoc that can cause denial of service; CVE-2024-21536, a flaw in the http-proxy-middleware package that also leads to denial of service; and CVE-2025-30204, a flaw in the golang-jwt library that allows excessive memory allocation during JWT header parsing. The advisory also includes security updates for libxml2 and openssl. The vendor recommends upgrading to RHACS 4.5.9, which contains fixes for these issues. The advisory covers multiple architectures including x86_64, ppc64le, and s390x for RHEL 8.

CWE-400Uncontrolled Resource Consumption (opens in a new tab)
Class weaknessLikelihood of exploit: High
The product does not properly control the allocation and maintenance of a limited resource.
MITRE discourages mapping vulnerabilities to this broad entry; the root cause is usually a more specific weakness.
Architecture and Design
Design throttling mechanisms into the system architecture. The best protection is to limit the amount of resources that an unauthorized user can cause to be expended. A strong authentication and access control model will help prevent such attacks from occurring in the first place.
Architecture and Design
Mitigation of resource exhaustion attacks requires that the target system either: recognizes the attack and denies that user further access for a given amount of time, or; uniformly throttles all requests in order to make it more difficult to consume resources more quickly than they can again be freed.
Architecture and Design
Ensure that protocols have specific limits of scale placed on them.
OWASP Cheat Sheets
File Upload (opens in a new tab)
OWASP ASVS 4.0.3
V12.1.1 (opens in a new tab)
Attack patterns
XML Ping of the Death (opens in a new tab)
Regular Expression Exponential Blowup (opens in a new tab)
Sustained Client Engagement (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (opens in a new tab)
Variant weakness
The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.
Implementation
By freezing the object prototype first (for example, Object.freeze(Object.prototype)), modification of the prototype becomes impossible.
Architecture and Design
By blocking modifications of attributes that resolve to object prototype, such as proto or prototype, this weakness can be mitigated.
Implementation · Input Validation
When handling untrusted objects, validating using a schema can be used.
OWASP Cheat Sheets
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V5.1.2 (opens in a new tab)
Attack patterns
Accessing Functionality Not Properly Constrained by ACLs (opens in a new tab)
Exploiting Incorrectly Configured Access Control Security Levels (opens in a new tab)
Manipulating User-Controlled Variables (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-405Asymmetric Resource Consumption (Amplification) (opens in a new tab)
Class weakness
The product does not properly control situations in which an adversary can cause the product to consume or produce excessive resources without requiring the adversary to invest equivalent work or otherwise prove authorization, i.e., the adversary's influence is "asymmetric."
Architecture and Design
An application must make resources available to a client commensurate with the client's access level.
Architecture and Design
An application must, at all times, keep track of allocated resources and meter their usage appropriately.
System Configuration
Consider disabling resource-intensive algorithms on the server side, such as Diffie-Hellman key exchange.
OWASP Cheat Sheets
File Upload (opens in a new tab)
OWASP ASVS 4.0.3
V12.1.1 (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 10 Aug 2026, 18:15 UTC

WeaknessesCWE-400, CWE-1321, CWE-405

Technical details

References

Community reviews

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