HOMEVULNERABILITIESCVE-2023-45139
HIGH

CVE-2023-45139

CWE-611Published: January 10, 2024· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

fontTools is a library for manipulating fonts, written in Python. The subsetting module has a XML External Entity Injection (XXE) vulnerability which allows an attacker to resolve arbitrary entities when a candidate font (OT-SVG fonts), which contains a SVG table, is parsed. This allows attackers to include arbitrary files from the filesystem fontTools is running on or make web requests from the host system. This vulnerability has been patched in version 4.43.0.

NVD Source

Technical Analysis

CVE-2023-45139 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

fonttools1 product(s)
fonttools
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/fonttools/fonttools/commit/9f61271dc1ca82ed91f529b130fe5dc5c9bf1f4c
PATCHhttps://github.com/fonttools/fonttools/commit/9f61271dc1ca82ed91f529b130fe5dc5c9bf1f4c
ADVISORYhttps://github.com/fonttools/fonttools/security/advisories/GHSA-6673-4983-2vx5
ADVISORYhttps://github.com/fonttools/fonttools/security/advisories/GHSA-6673-4983-2vx5

All References (12)

→
http://www.openwall.com/lists/oss-security/2024/03/08/2
→
http://www.openwall.com/lists/oss-security/2024/03/09/1
→
https://github.com/fonttools/fonttools/commit/9f61271dc1ca82ed91f529b130fe5dc5c9bf1f4cPatch
→
https://github.com/fonttools/fonttools/releases/tag/4.43.0Release Notes
→
https://github.com/fonttools/fonttools/security/advisories/GHSA-6673-4983-2vx5Exploit · Vendor Advisory
→
https://lists.fedoraproject.org/archives/list/[email protected]/message/VY63B4SGY4QOQGUXMECRGD6K3YT3GJ75/
→
http://www.openwall.com/lists/oss-security/2024/03/08/2
→
http://www.openwall.com/lists/oss-security/2024/03/09/1
→
https://github.com/fonttools/fonttools/commit/9f61271dc1ca82ed91f529b130fe5dc5c9bf1f4cPatch
→
https://github.com/fonttools/fonttools/releases/tag/4.43.0Release Notes
→
https://github.com/fonttools/fonttools/security/advisories/GHSA-6673-4983-2vx5Exploit · Vendor Advisory
→
https://lists.fedoraproject.org/archives/list/[email protected]/message/VY63B4SGY4QOQGUXMECRGD6K3YT3GJ75/

Quick Facts

CVE IDCVE-2023-45139
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-611
CISA KEVNo
Affected1 vendor(s)
PublishedJan 10, 2024

Related CVEs (CWE-611)

CVE-2018-1000644
10.0
CVE-2018-1000652
10.0
CVE-2017-8110
10.0
CVE-2018-1000124
10.0
CVE-2018-1000651
10.0
CVE-2023-38490
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-45139 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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