CVE-2021-21217

Process-memory disclosure via uninitialized PDFium data

Published Apr 26, 2021 · Updated Aug 3, 2024

Uninitialized data use in PDFium in Google Chrome before 90.0.4430.72 allows remote attackers to read process memory via a crafted PDF file. Public records identify PDFium's use of uninitialized data but do not disclose the affected function, allocation, or read operation. Exploitation requires a user to open the crafted PDF, and the reported consequence is limited to disclosure of potentially sensitive process memory.

CVSS severity5.5
Medium
EPSS probability1.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uninitialized data use in PDFium in Google Chrome before 90.0.4430.72 allows remote attackers to read process memory via a crafted PDF file. Public records identify PDFium's use of uninitialized data but do not disclose the affected function, allocation, or read operation. Exploitation requires a user to open the crafted PDF, and the reported consequence is limited to disclosure of potentially sensitive process memory.

The record

CVE
CVE-2021-21217
Published
Apr 26, 2021
Updated
Aug 3, 2024
Vendor
Google Cloud
Product
Google Chrome
Classifications
CWE-200, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 26, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <90.0.4430.72

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Google Cloud · Google Chromeversion=unspecified <90.0.4430.72

Published CVSS scores

5.5National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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