Is CVE-2017-9233 in the CISA KEV catalog?

No. CVE-2017-9233 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-9233?

CVE-2017-9233 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2017-9233?

CVE-2017-9233 has an EPSS score of 9.05% (95th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-9233?

Upgrade expat on debian 11 to 2.2.1-1 or later. Fixes are available for 14 affected products.

CVE & CISA-KEV Catalog

CVE-2017-9233

HIGHEPSS 95th pctl

7.5

CVSS v3

NVD

Description

XML External Entity vulnerability in libexpat 2.2.0 and earlier (Expat XML Parser Library) allows attackers to put the parser in an infinite loop using a malformed external entity definition from an external DTD.

CWE-611XML External Entity (XXE)CWE-835

How to fix

Remediation Available

expatDebian

Fixed in:2.2.1-1CVE-2017-9233

coin3Ubuntu

Fixed in:3.1.4~abc9f50-4ubuntu2+esm1USN-4825-1

Fixed in:3.1.4~abc9f50+dfsg1-1ubuntu0.1~esm1USN-4825-1

expatUbuntu

Fixed in:2.1.0-4ubuntu1.4USN-3356-1

Fixed in:2.1.0-7ubuntu0.16.04.3USN-3356-1

lib64expat1Ubuntu

Fixed in:2.1.0-4ubuntu1.4USN-3356-1

Fixed in:2.1.0-7ubuntu0.16.04.3USN-3356-1

libcoin80Ubuntu

Fixed in:3.1.4~abc9f50-4ubuntu2+esm1USN-4825-1

libcoin80-runtimeUbuntu

Fixed in:3.1.4~abc9f50-4ubuntu2+esm1USN-4825-1

Fixed in:3.1.4~abc9f50+dfsg1-1ubuntu0.1~esm1USN-4825-1

libcoin80v5Ubuntu

Fixed in:3.1.4~abc9f50+dfsg1-1ubuntu0.1~esm1USN-4825-1

libexpat1Ubuntu

Fixed in:2.1.0-4ubuntu1.4USN-3356-1

Fixed in:2.1.0-7ubuntu0.16.04.3USN-3356-1

Python 2Windows application

Affected:3.5.0 3.5.4Fixed in:3.5.4Python Software Foundation

Affected:3.4.0 3.4.7Fixed in:3.4.7Python Software Foundation

Affected:3.6.0 3.6.2Fixed in:3.6.2Python Software Foundation

Affected:3.3.0 3.3.7Fixed in:3.3.7Python Software Foundation

Affected:2.7.0 2.7.15Fixed in:2.7.15Python Software Foundation

Python 3.10Windows application

Affected:3.6.0 3.6.2Fixed in:3.6.2Python Software Foundation

Affected:3.5.0 3.5.4Fixed in:3.5.4Python Software Foundation

Affected:2.7.0 2.7.15Fixed in:2.7.15Python Software Foundation

Affected:3.3.0 3.3.7Fixed in:3.3.7Python Software Foundation

Affected:3.4.0 3.4.7Fixed in:3.4.7Python Software Foundation

Python 3.11Windows application

Affected:3.4.0 3.4.7Fixed in:3.4.7Python Software Foundation

Affected:3.6.0 3.6.2Fixed in:3.6.2Python Software Foundation

Affected:2.7.0 2.7.15Fixed in:2.7.15Python Software Foundation

Affected:3.3.0 3.3.7Fixed in:3.3.7Python Software Foundation

Affected:3.5.0 3.5.4Fixed in:3.5.4Python Software Foundation

Python 3.12Windows application

Affected:3.6.0 3.6.2Fixed in:3.6.2Python Software Foundation

Affected:3.3.0 3.3.7Fixed in:3.3.7Python Software Foundation

Affected:2.7.0 2.7.15Fixed in:2.7.15Python Software Foundation

Affected:3.4.0 3.4.7Fixed in:3.4.7Python Software Foundation

Affected:3.5.0 3.5.4Fixed in:3.5.4Python Software Foundation

Python 3.8Windows application

Affected:3.5.0 3.5.4Fixed in:3.5.4Python Software Foundation

Affected:3.3.0 3.3.7Fixed in:3.3.7Python Software Foundation

Affected:2.7.0 2.7.15Fixed in:2.7.15Python Software Foundation

Affected:3.6.0 3.6.2Fixed in:3.6.2Python Software Foundation

Affected:3.4.0 3.4.7Fixed in:3.4.7Python Software Foundation

Python 3.9Windows application

Affected:3.5.0 3.5.4Fixed in:3.5.4Python Software Foundation

Affected:3.6.0 3.6.2Fixed in:3.6.2Python Software Foundation

Affected:2.7.0 2.7.15Fixed in:2.7.15Python Software Foundation

Affected:3.3.0 3.3.7Fixed in:3.3.7Python Software Foundation

Affected:3.4.0 3.4.7Fixed in:3.4.7Python Software Foundation

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

9.05%probability of exploitation in 30 days

95thpercentile

High risk: more likely to be exploited than 95% of all known CVEs.

References

Exploit1

libexpat.github.io

Third-Party Advisory9

Mailing List1

openwall.com

Other references2

Related Vulnerabilities

Other CWE-611 (XML External Entity (XXE)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-34102	Critical	9.8	100%	KEV	Fix
CVE-2019-9670	Critical	9.8	100%	KEV	Fix
CVE-2022-28219	Critical	9.8	97%	-	-
CVE-2024-22024	High	8.3	95%	-	-
CVE-2024-38653	High	7.5	92%	-	-
CVE-2017-12629	Critical	9.8	92%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.