Google Chrome FreeType Heap Buffer Overflow Vulnerability
Google · Chrome FreeType
The Freetype font rendering component in Google Chrome contains a heap buffer overflow that can lead to heap corruption. An attacker who can get a victim to open a crafted HTML page can potentially exploit this flaw, requiring only network delivery of the page and user interaction (visiting the page) with no authentication.
Heap buffer overflow in Freetype in Google Chrome prior to 86.0.4240.111 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
- Exploited
- Yes, in CISA KEV
- Reports
- 0
- Tactics
- 2/15
How an attack unfolds
Based on MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. mappings. Select a step to see the evidence.Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
First seen exploited 15 days before it was disclosed. Public exploit code (PoC-in-GitHub) appeared 1 day after disclosure.
- First seen exploitedVulnCheck KEV evidence15 days before
- Disclosedday 0
- Public exploit codePoC-in-GitHub+1 day
- Added to CISA KEVEU database agrees+12 mo
CISA KEV listing is when exploitation was confirmed, not necessarily the first attack.
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
2 TechniqueOne specific attacker behaviour in MITRE ATT&CK, such as T1190 “Exploit Public-Facing Application”. IDs with a dot, like T1059.004, are sub-techniques., grouped by TacticThe attacker’s goal at a stage of an attack in MITRE ATT&CK, such as Initial Access or Persistence. Each technique belongs to one or more tactics. in kill-chain order, 2 cited passages 2Initial AccessTA0001
Malicious webpage delivers exploit to victim browser
via a crafted HTML page
ExecutionTA0002
Heap overflow in browser yields code execution
Heap buffer overflow in Freetype in Google Chrome
Detection
0 rules for this CVE · 38 general rules for its techniquesRules for this CVE
0Sigma ruleAn open, vendor-neutral detection rule for log data. Security teams convert Sigma rules into searches for their own SIEM. that reference CVE-2020-15999 directly.CVE-specific rules are not available in this build. Search SigmaHQ ↗
General rules for this CVE’s techniques
These detect the technique in general, not this specific vulnerability.
Drive-by CompromiseT11893 general rules
Exploitation for Client ExecutionT120335 general rules
- Antivirus - Exploitation Framework Signaturecriticalstable
- Droppers Exploiting CVE-2017-11882criticalstable
- Audit CVE Eventcriticaltest
- CVE-2021-31979 CVE-2021-33771 Exploitscriticaltest
- CVE-2021-31979 CVE-2021-33771 Exploits by Sourgumcriticaltest
- Exploit for CVE-2017-8759criticaltest
- Antivirus - APT Malware Signaturecriticalexperimental
- Antivirus - Remote Access Tools Signaturecriticalexperimental
Sigma rules © SigmaHQ, Detection Rule License 1.1; linked, not reproduced.
Am I affected? What do I upgrade to?
From GitHub Security Advisories and OSV4 packages in 1 ecosystem. No single main package: each of these ships the affected code.
- NuGetCefSharp.CommonAffected: All versions before 85.3.130Upgrade to 85.3.130 or later
- NuGetCefSharp.WpfAffected: All versions before 85.3.130Upgrade to 85.3.130 or later
- NuGetCefSharp.WinFormsAffected: All versions before 85.3.130Upgrade to 85.3.130 or later
- NuGetCefSharp.Wpf.HwndHostAffected: All versions before 85.3.130Upgrade to 85.3.130 or later
What security researchers reported
Not named in any threat report yetAlso mentioned in 50 community threat pulses (AlienVault OTX)
Weaker evidencePulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.
- Actively_Exploited_Kev | Oct 29, 202628 Oct 2026
- Actively_Exploited_Kev | Oct 28, 202627 Oct 2026
- Actively_Exploited_Kev | Oct 27, 202626 Oct 2026
- Actively_Exploited_Kev | Oct 24, 202623 Oct 2026
- Actively_Exploited_Kev | Oct 23, 202622 Oct 2026
- Actively_Exploited_Kev | Oct 22, 202621 Oct 2026
- 44 more on OTX