01 Record

CVE-2021-46143

In doProlog in xmlparse.c in Expat (aka libexpat) before 2.4.3, an integer overflow exists for m_groupSize.

HighPUBLISHEDCNA: mitre

CNA base score8.1 CVSS v3.xCVSS:3.1/AC:H/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N

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02 Description

In doProlog in xmlparse.c in Expat (aka libexpat) before 2.4.3, an integer overflow exists for m_groupSize.

03 Exploitation and scoring

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

4.22% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 90.8% of scored records. A rank, not a probability.

NVD base score

7.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-10-14.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2022-01-06 03:48Z4 YR AGO

Last updated

2026-10-14 12:07Z15 DAYS AGO

Reserved

2022-01-06

Assigning CNA

mitre

Record state

PUBLISHED

Severity

High (CVSS 8.1)

CNA CVSS vector

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

Weaknesses

CWE-190Integer Overflow or WraparoundBase

Data version

5.2

Document digest

61aaa7c43333143c75dd6952ff4009f6ece0dc342bcfe2fb0fb8da7c8a2efc60

05 Affected products

VendorProductVersionsPlatforms

libexpat_projectlibexpatNot specified—

netappactive_iq_unified_managerNot specified—

netappclustered_data_ontapNot specified—

netapphci_baseboard_management_controllerNot specified—

netapponcommand_workflow_automationNot specified—

netappsolidfire_&_hci_management_nodeNot specified—

redhatenterprise_linuxNot specified—

redhatjboss_core_servicesNot specified—

redhatrhel_ausNot specified—

redhatrhel_eus_long_lifeNot specified—

siemenssinema_remote_connect_serverNot specified—

tenablenessusNot specified—

06 References

github.comhttps://github.com/libexpat/libexpat/issues/532x_refsource_MISC
github.comhttps://github.com/libexpat/libexpat/pull/538x_refsource_MISC
www.openwall.com[oss-security] 20220117 Expat 2.4.3 released, includes 8 security fixeshttp://www.openwall.com/lists/oss-security/2022/01/17/3mailing-listx_refsource_MLIST
security.netapp.comhttps://security.netapp.com/advisory/ntap-20220121-0006/x_refsource_CONFIRM
www.tenable.comhttps://www.tenable.com/security/tns-2022-05x_refsource_CONFIRM
www.debian.orgDSA-5073https://www.debian.org/security/2022/dsa-5073vendor-advisoryx_refsource_DEBIAN
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfx_refsource_CONFIRM
security.gentoo.orgGLSA-202209-24https://security.gentoo.org/glsa/202209-24vendor-advisoryx_refsource_GENTOO
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-484086.html
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-398330.html

07 Fixed in

AlmaLinux 8

expat
Fixed in 2.2.5-8.el8_6.2
expat-devel
Fixed in 2.2.5-8.el8_6.2
xmlrpc-c
Fixed in 1.51.0-8.el8
xmlrpc-c-c++
Fixed in 1.51.0-8.el8
xmlrpc-c-client
Fixed in 1.51.0-8.el8
xmlrpc-c-client++
Fixed in 1.51.0-8.el8
xmlrpc-c-devel
Fixed in 1.51.0-8.el8

CloudLinux 8

expat
Fixed in 2.2.5-8.el8_6.2
expat-devel
Fixed in 2.2.5-8.el8_6.2
xmlrpc-c
Fixed in 1.51.0-8.el8
xmlrpc-c-c++
Fixed in 1.51.0-8.el8
xmlrpc-c-client
Fixed in 1.51.0-8.el8
xmlrpc-c-client++
Fixed in 1.51.0-8.el8
xmlrpc-c-devel
Fixed in 1.51.0-8.el8

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Debian 12

expat
Fixed in 2.4.3-1
libxmltok
No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

expat
Fixed in 2.4.3-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

expat
Fixed in 2.4.3-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.