01 Record

CVE-2022-25315

In Expat (aka libexpat) before 2.4.5, there is an integer overflow in storeRawNames.

CriticalPUBLISHEDCNA: mitre

CNA base score9.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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02 Description

In Expat (aka libexpat) before 2.4.5, there is an integer overflow in storeRawNames.

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.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
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

4.82% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 91.6% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

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

Red Hat severity

Important. 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

2022-02-18 04:24Z4 YR AGO

Last updated

2026-10-14 16:19Z15 DAYS AGO

Reserved

2022-02-18

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

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

Weaknesses

CWE-190Integer Overflow or WraparoundBase
CWE-787Out-of-bounds WriteBase

Data version

5.2

Document digest

1b7661490336d8949c25da422522c66237266440895c0c2f95b91372d6589c35

05 Affected products

VendorProductVersionsPlatforms

debiandebian_linuxNot specified—

fedoraprojectfedoraNot specified—

libexpat_projectlibexpatNot specified—

oraclehttp_serverNot specified—

oraclezfs_storage_appliance_kitNot specified—

redhatenterprise_linuxNot specified—

redhatjboss_core_servicesNot specified—

redhatrhel_e4sNot specified—

redhatrhel_elsNot specified—

redhatrhel_eusNot specified—

redhatrhev_hypervisorNot specified—

siemenssinema_remote_connect_serverNot specified—

06 References

github.comhttps://github.com/libexpat/libexpat/pull/559x_refsource_MISC
www.openwall.com[oss-security] 20220219 Expat 2.4.5 released, includes 5 security fixeshttp://www.openwall.com/lists/oss-security/2022/02/19/1mailing-listx_refsource_MLIST
www.debian.orgDSA-5085https://www.debian.org/security/2022/dsa-5085vendor-advisoryx_refsource_DEBIAN
lists.fedoraproject.orgFEDORA-2022-04f206996bhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3UFRBA3UQVIQKXTBUQXDWQOVWNBKLERU/vendor-advisoryx_refsource_FEDORA
lists.fedoraproject.orgFEDORA-2022-3d9d67f558https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y27XO3JMKAOMQZVPS3B4MJGEAHCZF5OM/vendor-advisoryx_refsource_FEDORA
lists.debian.org[debian-lts-announce] 20220307 [SECURITY] [DLA 2935-1] expat security updatehttps://lists.debian.org/debian-lts-announce/2022/03/msg00007.htmlmailing-listx_refsource_MLIST
www.oracle.comhttps://www.oracle.com/security-alerts/cpuapr2022.htmlx_refsource_MISC
security.netapp.comhttps://security.netapp.com/advisory/ntap-20220303-0008/x_refsource_CONFIRM
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
firefox
Fixed in 91.7.0-3.el8_5.alma
mingw32-expat
Fixed in 2.4.8-1.el8
mingw64-expat
Fixed in 2.4.8-1.el8
thunderbird
Fixed

A version is affected if any line below covers it.
- Affected before 91.7.0-2.el8_5.alma
- Affected before 91.7.0-2.el8_5.alma.plus

CloudLinux 8

expat
Fixed in 2.2.5-8.el8_6.2
expat-devel
Fixed in 2.2.5-8.el8_6.2
firefox
Fixed in 91.7.0-3.el8_5.alma
mingw32-expat
Fixed in 2.4.8-1.el8
mingw64-expat
Fixed in 2.4.8-1.el8
thunderbird
Fixed

A version is affected if any line below covers it.
- Affected before 91.7.0-2.el8_5.alma
- Affected before 91.7.0-2.el8_5.alma.plus

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

Debian 12

expat
Fixed in 2.4.5-1
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 2.4.5-1

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

Debian 14

expat
Fixed in 2.4.5-1

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