Memory disclosure via embedded-font buffer over-read
Published Jan 18, 2023 · Updated Mar 5, 2025
Out-of-bounds read in Adobe Acrobat Reader 22.003.20282 and earlier allows attackers to disclose process memory when a malicious PDF is opened. Embedded-font parsing trusts crafted font data and reads past the end of its allocated buffer. A victim must open the file; affected Continuous and 2020 builds on Windows and macOS can expose memory useful for bypassing ASLR, while code execution requires another flaw.
Summary
What happened
Out-of-bounds read in Adobe Acrobat Reader 22.003.20282 and earlier allows attackers to disclose process memory when a malicious PDF is opened. Embedded-font parsing trusts crafted font data and reads past the end of its allocated buffer. A victim must open the file; affected Continuous and 2020 builds on Windows and macOS can expose memory useful for bypassing ASLR, while code execution requires another flaw.
The record
- CVE
- CVE-2023-21585
- Published
- Jan 18, 2023
- Updated
- Mar 5, 2025
- Vendor
- Adobe
- Product
- Adobe Acrobat Reader
- Classifications
- CWE-125, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 18, 2023CVE publishedPublication date reported by the CVE source.
- Mar 5, 2025Record 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 <=20.005.30418
- Affected versionversion=unspecified <=22.003.20281
- Affected versionversion=unspecified <=22.003.20282
- 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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