Memory disclosure via PDFLibTool out-of-bounds read
Published Aug 20, 2021 · Updated Sep 17, 2024
Out-of-bounds read in Adobe Acrobat Reader 2017, 2020, and DC allows attackers to disclose process memory through a malicious PDF. Adobe identifies PDFLibTool as the affected component but has not published which parsing operation reads beyond its buffer boundary. Exploitation requires a victim to open a malicious file, and the documented consequence is memory disclosure in the current user's context.
Summary
What happened
Out-of-bounds read in Adobe Acrobat Reader 2017, 2020, and DC allows attackers to disclose process memory through a malicious PDF. Adobe identifies PDFLibTool as the affected component but has not published which parsing operation reads beyond its buffer boundary. Exploitation requires a victim to open a malicious file, and the documented consequence is memory disclosure in the current user's context.
The record
- CVE
- CVE-2021-35987
- Published
- Aug 20, 2021
- Updated
- Sep 17, 2024
- Vendor
- Adobe
- Product
- Adobe Acrobat Reader
- Classifications
- CWE-125, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 20, 2021CVE publishedPublication date reported by the CVE source.
- Sep 17, 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.
- Affected versionversion=unspecified <=2017.011.30197
- Affected versionversion=unspecified <=2020.004.30005
- Affected versionversion=unspecified <=2021.005.20054
- Affected versionversion=unspecified <=None
What conditions does exploitation require?
What is affected?
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.
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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