Cyber Resilience

CVE-2024-28757

Fedoraproject Fedora 38 … 40

Public PoC
Published
10 March 2024
Modified
17 June 2026
Patch / advisory
View advisory
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.020 79th percentile
Risk Priority 61 floored blend · peak EPSS

Summary

CVE-2024-28757 is a high-severity XML Entity Expansion (CWE-776) vulnerability in Fedoraproject Fedora. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Endpoint Denial of Service (T1499); ranked in the top 21% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified map to CM-6 (Configuration Settings) and SI-10 (Information Input Validation) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A02:2025 Security Misconfiguration

EU & UK References

Vulnerability Data

libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isolated use of external parsers (created via XML_ExternalEntityParserCreate).

CWE(s)
CWE-776

Related Threats

MITRE ATT&CK Enterprise Techniques

T1499 Endpoint Denial of Service Impact
Adversaries may perform Endpoint Denial of Service (DoS) attacks to degrade or block the availability of services to users.
attack.mitre.org →
T1499.003 Application Exhaustion Flood Impact
Adversaries may target resource intensive features of applications to cause a denial of service (DoS), denying availability to those applications.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-43398Same product class: NAS / storage appliance
CVE-2024-50602Same product: Libexpat Project Libexpat
CVE-2023-4408Same product: Fedoraproject Fedora
CVE-2023-2828Same product: Fedoraproject Fedora
CVE-2024-2398Same product: Fedoraproject Fedora
CVE-2023-4236Same product: Fedoraproject Fedora
CVE-2023-2269Same product: Fedoraproject Fedora
CVE-2024-26462Same product: Netapp Active Iq Unified Manager
CVE-2023-32247Same product: Netapp H300S
CVE-2024-26458Same product: Netapp Active Iq Unified Manager

Affected Assets

libexpat project
libexpat
≤ 2.6.2
fedoraproject
fedora
38, 39, 40
netapp
active iq unified manager
all versions
netapp
oncommand workflow automation
all versions
netapp
ontap
9
netapp
ontap tools
10
netapp
windows host utilities
all versions
netapp
h300s firmware
all versions
netapp
h500s firmware
all versions
netapp
h700s firmware
all versions
+4 more product configuration(s) — see NVD for full list

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

CM-6 Configuration Settings good match

Secure configuration settings can disable DTD processing or cap entity expansion in XML parsers.

SI-10 Information Input Validation good match

Input validation can enforce limits on XML entity expansion and recursion depth before parsing occurs.

CM-7 Least Functionality partial match

Least-functionality configuration can prohibit unsafe DTD features or external entity resolution.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 full match
prevents

Secure SDLC practices directly prevent introduction of improper recursive entity handling in XML code.

PR.PS-01 mostly match
prevents

Hardened configuration baselines can disable or limit DTD entity expansion in XML parsers.

ID.RA-01 partial match
prevents

Identifying and recording vulnerabilities can discover XML entity expansion flaws before exploitation.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect and block XML entity-expansion vulnerabilities before deployment.

A.8.25 Secure development life cycle partial match
prevents

Secure SDLC mandates input validation and parser hardening that can prevent unbounded entity expansion.

A.8.26 Application security requirements partial match
prevents

Application security requirements can explicitly call for limits on XML entity recursion and DTD processing.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles discourage unsafe parser configurations that enable entity expansion attacks.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly require disabling or restricting recursive entity references in XML parsers.

References