CVE-2020-15999 (GCVE-0-2020-15999)

Vulnerability from cvelistv5 – Published: 2020-11-03 00:00 – Updated: 2025-10-21 23:35
VLAI CISA KEVIntel
Summary
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.
Severity
9.6 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • Heap buffer overflow
  • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Assigner
References
Impacted products
Vendor Product Version
Google Chrome Affected: unspecified , < 86.0.4240.111 (custom)
Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: f06e40b2-7270-4648-8a8f-424352444529

Vulnerability ID: CVE-2020-15999

Status: Confirmed

Status Updated: 2021-11-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEV entry: Google Chrome FreeType Heap Buffer Overflow Vulnerability | Affected: Google / Chrome FreeType | Description: Google Chrome uses FreeType, an open-source software library to render fonts, which contains a heap buffer overflow vulnerability in the function Load_SBit_Png when processing PNG images embedded into fonts. This vulnerability is part of an exploit chain with CVE-2020-17087 on Windows and CVE-2020-16010 on Android. | Required action: Apply updates per vendor instructions. | Due date: 2021-11-17 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2020-15999
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-787
Feed CISA Known Exploited Vulnerabilities Catalog
Product Chrome FreeType
Due Date 2021-11-17
Date Added 2021-11-03
Vendorproject Google
Vulnerabilityname Google Chrome FreeType Heap Buffer Overflow Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:28 UTC | Updated: 2026-02-06 07:17 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: fc473179-2308-4bcd-b061-d469f62020c8

Vulnerability ID: CVE-2020-15999

Status: Confirmed

Status Updated: 2021-11-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEVIntel entry: 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... | Affected: Google / Chrome | CVSS: 9.6 (CRITICAL) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title 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...
Vendor Google
Product Chrome
Added Date 2021-11-03T00:00:00.000Z
Cvss Score 9.6
Epss Score None
Cvss Severity CRITICAL
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:04 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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updates per vendor instructions.\",\"cisaVulnerabilityName\":\"Google Chrome FreeType Heap Buffer Overflow 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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-06-28T07:33:18+00:00",
      "cve": "CVE-2020-15999",
      "id": "CVE-2020-15999",
      "initial_release_date": "2020-10-19T00:00:00+00:00",
      "product_status:fixed": "162",
      "product_status:known_not_affected": "10",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "freetype: Heap-based buffer overflow due to integer truncation in Load_SBit_Png",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-15999.json",
      "version": "3"
    },
    "vulnrichment": {
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      "cveMetadata": "{\"cveId\": \"CVE-2020-15999\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-21T23:35:33.599Z\", \"dateReserved\": \"2020-07-27T00:00:00.000Z\", \"assignerOrgId\": \"ebfee0ef-53dd-4cf3-9e2a-08a5bd7a7e28\", \"datePublished\": \"2020-11-03T00:00:00.000Z\", \"assignerShortName\": \"Chrome\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.