CVE-2024-28757
published 2024-03-10CVE-2024-28757: libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isolated use of external parsers (created via XML_ExternalEntityParserCreate).
PriorityP340high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
2.01%
78.8th percentile
libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isolated use of external parsers (created via XML_ExternalEntityParserCreate).
Affected
16 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | expat | < expat 2.6.1-2 (forky) | expat 2.6.1-2 (forky) |
| debian | libxmltok | < expat 2.6.1-2 (forky) | expat 2.6.1-2 (forky) |
| fedoraproject | fedora | — | — |
| fedoraproject | fedora | — | — |
| fedoraproject | fedora | — | — |
| libexpat_project | libexpat | < 2.6.2 | 2.6.2 |
| msrc | azl3_cmake_3.30.3-6_on_azure_linux_3.0 | — | — |
| msrc | azl3_expat_2.5.0-1_on_azure_linux_3.0 | — | — |
| msrc | azl3_expat_2.6.2-1_on_azure_linux_3.0 | — | — |
| msrc | azl3_python3_3.12.3-5_on_azure_linux_3.0 | — | — |
| msrc | cbl2_cmake_3.21.4-17_on_cbl_mariner_2.0 | — | — |
| msrc | cbl2_expat_2.5.0-1_on_cbl_mariner_2.0 | — | — |
| msrc | cbl2_expat_2.6.2-2_on_cbl_mariner_2.0 | — | — |
| msrc | cbl2_python3_3.9.19-13_on_cbl_mariner_2.0 | — | — |
| netapp | ontap | — | — |
| netapp | ontap_tools | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
osv7.5HIGH
vendor_debian7.5LOW
vendor_msrc7.5HIGH
vendor_redhat7.5HIGH
vendor_ubuntu7.5HIGH
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OSV
expat vulnerabilities
osv·2024-03-14·CVSS 7.5
CVE-2023-52425 [HIGH] expat vulnerabilities
expat vulnerabilities
It was discovered that Expat could be made to consume large amounts of
resources. If a user or automated system were tricked into processing
specially crafted input, an attacker could possibly use this issue to cause
a denial of service. (CVE-2023-52425, CVE-2024-28757)
OSV
CVE-2024-28757: libexpat through 2
osv·2024-03-10·CVSS 7.5
CVE-2024-28757 [HIGH] CVE-2024-28757: libexpat through 2
libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isolated use of external parsers (created via XML_ExternalEntityParserCreate).
GHSA
GHSA-ch5v-h69f-mxc8: libexpat through 2
ghsa_unreviewed·2024-03-10
CVE-2024-28757 [HIGH] CWE-776 GHSA-ch5v-h69f-mxc8: libexpat through 2
libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isolated use of external parsers (created via XML_ExternalEntityParserCreate).
CISA ICS
Hitachi Energy RTU500 Series
cisa_ics·2025-09-16·CVSS 7.5
[HIGH] Hitachi Energy RTU500 Series
ICS Advisory
##
Hitachi Energy RTU500 Series
Release DateSeptember 16, 2025
Alert CodeICSA-25-259-02
Related topics:
Industrial Control System Vulnerabilities, Industrial Control Systems
View CSAF
## 1. EXECUTIVE SUMMARY
- CVSS v4 8.2
- ATTENTION: Exploitable remotely/low attack complexity
- Vendor: Hitachi Energy
- Equipment: RTU500 series
- Vulnerabilities: NULL Pointer Dereference, Improper Validation of Integrity Check Value, Improper Restriction of XML External Entity Reference, Heap-based Buffer Overflow, Integer Overflow or Wraparound, Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion'), Stack-based Buffer Overflow
## 2. RISK EVALUATION
Successful exploitation of these vulnerabilities could cause a Denial-of-Servi
CISA ICS
Siemens SINEC NMS
cisa_ics·2024-08-15·CVSS 7.0
[HIGH] Siemens SINEC NMS
ICS Advisory
##
Siemens SINEC NMS
Release DateAugust 15, 2024
Alert CodeICSA-24-228-06
Related topics:
Industrial Control System Vulnerabilities, Industrial Control Systems
As of January 10, 2023, CISA will no longer be updating ICS security advisories for Siemens product vulnerabilities beyond the initial advisory. For the most up-to-date information on vulnerabilities in this advisory, please see Siemens' ProductCERT Security Advisories (CERT Services | Services | Siemens Global).
View CSAF
## 1. EXECUTIVE SUMMARY
- CVSS v4 9.4
- ATTENTION: Exploitable remotely/low attack complexity
- Vendor: Siemens
- Equipment: SINEC NMS
- Vulnerabilities: Use After Free, Improper Input Validation, Deserialization of Untrusted Data, Improper Restriction of Operations
BSD
OpenBSD 7.4 Errata 015: SECURITY FIX
bsd_advisories·2024-03-18·CVSS 7.5
CVE-2024-28757 [HIGH] OpenBSD 7.4 Errata 015: SECURITY FIX
OpenBSD 7.4 Errata 015: SECURITY FIX
015: SECURITY FIX: March 18, 2024
All architectures In libexpat fix billion laughs attack vulnerability CVE-2024-28757.
BSD
OpenBSD 7.3 Errata 027: SECURITY FIX
bsd_advisories·2024-03-18·CVSS 7.5
CVE-2024-28757 [HIGH] OpenBSD 7.3 Errata 027: SECURITY FIX
OpenBSD 7.3 Errata 027: SECURITY FIX
027: SECURITY FIX: March 18, 2024
All architectures In libexpat fix billion laughs attack vulnerability CVE-2024-28757.
Ubuntu
Expat vulnerabilities
vendor_ubuntu·2024-03-14·CVSS 7.5
CVE-2024-28757 [HIGH] Expat vulnerabilities
Title: Expat vulnerabilities
Summary: Expat could be made to crash if it received specially crafted
input.
It was discovered that Expat could be made to consume large amounts of
resources. If a user or automated system were tricked into processing
specially crafted input, an attacker could possibly use this issue to cause
a denial of service. (CVE-2023-52425, CVE-2024-28757)
Instructions: In general, a standard system update will make all the necessary changes.
Microsoft
libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isolated use of external parsers (created via XML_ExternalEntityParserCreate).
vendor_msrc·2024-03-12·CVSS 7.5
CVE-2024-28757 [HIGH] libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isolated use of external parsers (created via XML_ExternalEntityParserCreate).
libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isolated use of external parsers (created via XML_ExternalEntityParserCreate).
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
mitre:
Red Hat
expat: XML Entity Expansion
vendor_redhat·2024-03-10·CVSS 7.5
CVE-2024-28757 [HIGH] CWE-776 expat: XML Entity Expansion
expat: XML Entity Expansion
libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isolated use of external parsers (created via XML_ExternalEntityParserCreate).
An XML Entity Expansion flaw was found in libexpat. This flaw allows an attacker to cause a denial of service when there is an isolated use of external parsers.
Statement: This vulnerability is rated as a moderate severity because a flaw was found in the libexpat library in the xmlparse.c file, specifically in the handling of external parsers. The issue is an XML Entity Expansion flaw caused by the parser's failure to detect direct recursion when a parameter entity references itself in an external subset. An attacker can trigger this by submitting a specially crafted XML document, which creates an infinite p
Debian
CVE-2024-28757: expat - libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isola...
vendor_debian·2024·CVSS 7.5
CVE-2024-28757 [HIGH] CVE-2024-28757: expat - libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isola...
libexpat through 2.6.1 allows an XML Entity Expansion attack when there is isolated use of external parsers (created via XML_ExternalEntityParserCreate).
Scope: local
bookworm: open
bullseye: open
forky: resolved (fixed in 2.6.1-2)
sid: resolved (fixed in 2.6.1-2)
trixie: resolved (fixed in 2.6.1-2)
No detection rules found.
No public exploits indexed.
http://www.openwall.com/lists/oss-security/2024/03/15/1https://github.com/libexpat/libexpat/issues/839https://github.com/libexpat/libexpat/pull/842https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FPLC6WDSRDUYS7F7JWAOVOHFNOUQ43DD/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LKJ7V5F6LJCEQJXDBWGT27J7NAP3E3N7/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VK2O34GH43NTHBZBN7G5Y6YKJKPUCTBE/https://security.netapp.com/advisory/ntap-20240322-0001/http://www.openwall.com/lists/oss-security/2024/03/15/1https://github.com/libexpat/libexpat/issues/839https://github.com/libexpat/libexpat/pull/842https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FPLC6WDSRDUYS7F7JWAOVOHFNOUQ43DD/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LKJ7V5F6LJCEQJXDBWGT27J7NAP3E3N7/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VK2O34GH43NTHBZBN7G5Y6YKJKPUCTBE/https://lists.fedoraproject.org/archives/list/[email protected]/message/FPLC6WDSRDUYS7F7JWAOVOHFNOUQ43DD/https://lists.fedoraproject.org/archives/list/[email protected]/message/LKJ7V5F6LJCEQJXDBWGT27J7NAP3E3N7/https://lists.fedoraproject.org/archives/list/[email protected]/message/VK2O34GH43NTHBZBN7G5Y6YKJKPUCTBE/https://security.netapp.com/advisory/ntap-20240322-0001/
2024-03-10
Published