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CVE-2020-15999

Out-of-bounds Write: Is CVE-2020-15999 real, exploitable, or a false positive? Here's the community verdict.

Community verdict: No field verdicts yet. Be the first practitioner to weigh in.

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signals

public sources

Exploited in wild
Yes
CISA KEV · Nov 3, 2021
Public exploit
PoC (unverified)
Metasploit/EDB/PoC
Base severity
9.6 Critical
CVSS
Exploitation prob.
64%
FIRST EPSS
Weakness
CWE-787 · Out-of-bounds Write
CWE

Confirmed exploited in the wild. Patch this first, regardless of the base score.

cisa ssvc

CISA Vulnrichment · assessed

Exploitation
Active
in the wild
Automatable
No
at scale
Technical impact
Partial
on success

CISA decision, by how critical the affected system is to you:

  • low impact → Track
  • medium impact → Track
  • high impact → Attend

Track: normal patch cycle · Track*: watch closely · Attend: patch sooner · Act: patch now. About SSVC ↗

public exploits

links to sources — we don’t host code
GitHub PoC(3)unverified

Unverified proof-of-concept code has been published. It may or may not be functional — assess before relying on it.

affected packages

GHSA-pv36-h7jh-qm62 · GitHub rates it moderate
  • NuGetCefSharp.Common
    Vulnerable
    < 85.3.130
    Fixed in
    85.3.130
  • NuGetCefSharp.Wpf
    Vulnerable
    < 85.3.130
    Fixed in
    85.3.130
  • NuGetCefSharp.WinForms
    Vulnerable
    < 85.3.130
    Fixed in
    85.3.130
  • NuGetCefSharp.Wpf.HwndHost
    Vulnerable
    < 85.3.130
    Fixed in
    85.3.130

Source: GitHub Advisory Database (CC-BY 4.0), via OSV.dev. Check your lockfile version against the ranges above.

baseline read

auto · not a community verdict

Real — exploited in the wild

CISA confirms active exploitation. Treat scanner hits as true positives unless your specific version or config is unaffected.

Based on CISA KEV

Confirm or dispute →
Affected:GoogleFreetypeDebianFedoraprojectOpensuseNetapp

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

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.

References

NVD MITRE CVE.org CISA KEV VulnCheck KEV

Published · Added to CISA KEV (365 days after publication)

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timeline

  1. CISA SSVC assessment · exploitation: active
  2. Added to CISA KEV · confirmed exploited in the wild
  3. Published by NVD
  4. Added to VulnCheck KEV · reported exploited in the wild

Score and exploit changes tracked since .

Community ground truth

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In your experience, is this finding real and exploitable?

awaiting field verdicts
Real, but not a risk here
Not a real issue

Curated baseline: TruePositive's read from public sources is Real & exploitable — a starting point, not a community verdict.

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Field notes & remediation

Verdicts are the quick signal. Notes are the evidence and fixes behind them.

  • 0
    Field note · TruePositive EditorialCurated

    Google Chrome FreeType Heap Buffer Overflow Vulnerability — 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. Listed in the CISA KEV catalog (added 2021-11-03) — confirmed exploited in the wild, not theoretical. FIRST EPSS puts the chance of exploitation in the next 30 days at ~64%. Treat it as real and prioritize remediation over triage.

  • 0
    Remediation · TruePositive EditorialCurated

    Required action for Google Chrome FreeType: Apply updates per vendor instructions. CISA set a federal remediation due date of 2021-11-17. After patching, verify the vulnerable path is no longer reachable before closing the finding.

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Related CVEs

Same weakness: CWE-787 · Out-of-bounds Write.