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UK Cyber Defence
VulnerabilityModified

CVE-2019-1150

A remote code execution vulnerability exists when the Windows font library improperly handles specially crafted embedded fonts.

EXPLOIT ×2 ✓HIGH 8.8EPSS 26.2%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 26.2%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.

Description

A remote code execution vulnerability exists when the Windows font library improperly handles specially crafted embedded fonts. An attacker who successfully exploited the vulnerability could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. There are multiple ways an attacker could exploit the vulnerability: In a web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit the vulnerability and then convince users to view the website. An attacker would have no way to force users to view the attacker-controlled content. Instead, an attacker would have to convince users to take action, typically by getting them to click a link in an email or instant message that takes users to the attacker's website, or by opening an attachment sent through email. In a file-sharing attack scenario, an attacker could provide a specially crafted document file designed to exploit the vulnerability and then convince users to open the document file. The security update addresses the vulnerability by correcting how the Windows font library handles embedded fonts.

CVSS 3.1
8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
26.22% probability · 98th percentile
Public exploits
2 in Exploit-DB · verified · first 15 August 2019
CISA KEV
Not listed
Weakness
CWE-787, CWE-94
Affected
microsoft/windows 10 · microsoft/windows 7 · microsoft/windows 8.1 · microsoft/windows rt 8.1 · microsoft/windows server 2008 · microsoft/windows server 2012 · microsoft/windows server 2016 · microsoft/windows server 2019
Source
secure@microsoft.com
EPSS trend
0%15%30%24 September 2026: 26.22%27 October 2026: 26.22%24 September 202627 October 2026

EPSS moved from 26.2% on 24 September 2026 to 26.2% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.

Public exploits (2)

Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.

EDB-IDTitleTypePublishedVerified
EDB-47267source ↗Microsoft Font Subsetting - DLL Heap-Based Out-of-Bounds read in WriteTableFromStructurewindows · Google Security Researchdos15 August 2019yes
EDB-47265source ↗Microsoft Font Subsetting - DLL Heap Corruption in ReadTableIntoStructurewindows · Google Security Researchdos15 August 2019yes

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.