Code execution via stale object use in setAction
Published Aug 20, 2021 · Updated Sep 16, 2024
Use-after-free in Adobe Acrobat Reader DC 2021.005.20054 and earlier allows remote attackers to execute code via a malicious file. The setAction method operates on an object without first validating that the object still exists, permitting reuse of freed memory. Exploitation requires a victim to visit a malicious page or open a malicious file and runs code in the current user's context; the 2020 and 2017 tracks are also affected.
Summary
What happened
Use-after-free in Adobe Acrobat Reader DC 2021.005.20054 and earlier allows remote attackers to execute code via a malicious file. The setAction method operates on an object without first validating that the object still exists, permitting reuse of freed memory. Exploitation requires a victim to visit a malicious page or open a malicious file and runs code in the current user's context; the 2020 and 2017 tracks are also affected.
The record
- CVE
- CVE-2021-28639
- Published
- Aug 20, 2021
- Updated
- Sep 16, 2024
- Vendor
- Adobe
- Product
- Adobe Acrobat Reader
- Classifications
- CWE-416, T1204.002, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 20, 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 <=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.
Weakness, pattern, technique
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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