Application denial-of-service via null pointer dereference
Published Sep 29, 2021 · Updated Sep 16, 2024
Null pointer dereference in Adobe Acrobat Reader DC 2021.005.20060 and earlier allows remote attackers to cause application denial-of-service via a malicious file. The defect occurs when Reader processes crafted file data and dereferences a null pointer, terminating the application in the current user context. Exploitation is unauthenticated but requires a victim to open the file, limiting impact to interruption of that user's Reader process.
Summary
What happened
Null pointer dereference in Adobe Acrobat Reader DC 2021.005.20060 and earlier allows remote attackers to cause application denial-of-service via a malicious file. The defect occurs when Reader processes crafted file data and dereferences a null pointer, terminating the application in the current user context. Exploitation is unauthenticated but requires a victim to open the file, limiting impact to interruption of that user's Reader process.
The record
- CVE
- CVE-2021-39850
- Published
- Sep 29, 2021
- Updated
- Sep 16, 2024
- Vendor
- Adobe
- Product
- Adobe Acrobat Reader
- Classifications
- CWE-476, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 29, 2021CVE publishedPublication date reported by the CVE source.
- Sep 16, 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 <=17.0-Classic 2021 July
- Affected versionversion=unspecified <=20.0-Classic 2021 July
- Affected versionversion=unspecified <=DC 2021 July
- 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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