Memory disclosure via out-of-bounds document read
Published Sep 29, 2021 · Updated Sep 17, 2024
Out-of-bounds read in Adobe Acrobat Reader allows attackers to disclose process memory after a user opens a malicious file. Adobe identifies no affected component or parsing operation beyond the out-of-bounds read, leaving the precise memory-access mechanism undisclosed. Exposure requires a victim to open the file and affects Continuous through 2021.005.20060 on Windows or 2021.005.20058 on macOS, plus 2020 through 2020.004.30006 and 2017 through 2017.011.30199.
Summary
What happened
Out-of-bounds read in Adobe Acrobat Reader allows attackers to disclose process memory after a user opens a malicious file. Adobe identifies no affected component or parsing operation beyond the out-of-bounds read, leaving the precise memory-access mechanism undisclosed. Exposure requires a victim to open the file and affects Continuous through 2021.005.20060 on Windows or 2021.005.20058 on macOS, plus 2020 through 2020.004.30006 and 2017 through 2017.011.30199.
The record
- CVE
- CVE-2021-39861
- Published
- Sep 29, 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
- Sep 29, 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 <=2017.011.30199
- Affected versionversion=unspecified <=2020.004.30006
- Affected versionversion=unspecified <=2021.005.20060
- Affected versionversion=unspecified <=None
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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