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CVE-2024-28757

22
FAUCET Score

CVE-2024-28757 describes an XML Entity Expansion vulnerability in libexpat versions through 2.6.1, specifically when external parsers are used in isolation. This high-severity vulnerability (CVSS 7.5) allows an unauthenticated attacker to cause a denial of service (A:H) with low attack complexity (AC:L) over a network (AV:N). There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.6.2CPE matchmatch criteria
cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*
38CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*
39CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*
40CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:40:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.01%
Probability of exploitation in next 30 days
EPSS Percentile
78.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0201 is in the 63rd percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (21)

github_advisorypatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: 19906-17084Fixed in: 2.6.2-1
microsoftpatch availablevia msrc
Product: 19681-17086
microsoftpatch availablevia msrc
Product: 19756-17086
microsoftpatch availablevia msrc
Product: 17545-17084Fixed in: 3.12.9-1
microsoftpatch availablevia msrc
Product: azl3 python3 3.12.3-5 on Azure Linux 3.0Fixed in: 3.12.9-1
microsoftpatch availablevia msrc
Product: cbl2 expat 2.5.0-1 on CBL Mariner 2.0Fixed in: 2.6.2-2
microsoftpatch availablevia msrc
Product: azl3 expat 2.6.2-1 on Azure Linux 3.0Fixed in: 2.6.2-1
microsoftpatch availablevia msrc
Product: azl3 expat 2.5.0-1 on Azure Linux 3.0Fixed in: 2.6.2-1
microsoftpatch availablevia msrc
Product: cbl2 python3 3.9.19-13 on CBL Mariner 2.0
microsoftpatch availablevia msrc
Product: cbl2 cmake 3.21.4-17 on CBL Mariner 2.0
microsoftpatch availablevia msrc
Product: 17399-16823Fixed in: 2.6.2-2
microsoftpatch availablevia msrc
Product: 19901-17086Fixed in: 2.6.2-2
microsoftpatch availablevia msrc
Product: 18576-17086Fixed in: 2.6.2-2
microsoftpatch availablevia msrc
Product: 17783-17084Fixed in: 2.6.2-1
microsoftpatch availablevia msrc
Product: cbl2 expat 2.6.2-2 on CBL Mariner 2.0Fixed in: 2.6.2-2
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: expat-0:2.5.0-2.el9_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: expat-0:2.5.0-1.el9_3.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.2 Extended Update SupportFixed in: expat-0:2.5.0-1.el9_2.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: expat-0:2.5.0-1.el8_10
View patch
redhatno patchvia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: rhcos

Vendor Advisories (2)

microsoft2024-Mar/CVE-2024-28757Important

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

Mar 12, 2024
redhatCVE-2024-28757Moderate

expat: XML Entity Expansion

Mar 10, 2024

References

lists.fedoraproject.org / archives/list/[email protected]/message/FPLC6WDSRDUYS7F7JWAOVOHFNOUQ43DD
lists.fedoraproject.org / archives/list/[email protected]/message/LKJ7V5F6LJCEQJXDBWGT27J7NAP3E3N7
lists.fedoraproject.org / archives/list/[email protected]/message/VK2O34GH43NTHBZBN7G5Y6YKJKPUCTBE
github.com / libexpat/libexpat/issues/839
ExploitIssue TrackingPatch
github.com / libexpat/libexpat/pull/842
Issue TrackingPatch
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/FPLC6WDSRDUYS7F7JWAOVOHFNOUQ43DD
Mailing List
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/LKJ7V5F6LJCEQJXDBWGT27J7NAP3E3N7
Mailing List
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/VK2O34GH43NTHBZBN7G5Y6YKJKPUCTBE
Mailing List
security.netapp.com / advisory/ntap-20240322-0001
Third Party Advisory
openwall.com / lists/oss-security/2024/03/15/1
Mailing ListPatchRelease Notes