Memory disclosure via undersized avar SegmentMaps table
Published Feb 15, 2024 · Updated Feb 13, 2025
Out-of-bounds read in Adobe Acrobat and Reader 23.008.20470 and earlier allows attackers to disclose memory via a crafted PDF. The font parser compares positionMapCount with the avar table's total length without subtracting bytes already consumed, then reads four-byte axisValueMaps entries past the table boundary. Exploitation requires a victim to open a PDF containing a crafted OpenType font and can expose process memory that assists ASLR bypass.
Summary
What happened
Out-of-bounds read in Adobe Acrobat and Reader 23.008.20470 and earlier allows attackers to disclose memory via a crafted PDF. The font parser compares positionMapCount with the avar table's total length without subtracting bytes already consumed, then reads four-byte axisValueMaps entries past the table boundary. Exploitation requires a victim to open a PDF containing a crafted OpenType font and can expose process memory that assists ASLR bypass.
The record
- CVE
- CVE-2024-20748
- Published
- Feb 15, 2024
- Updated
- Feb 13, 2025
- Vendor
- Adobe
- Product
- Adobe Acrobat
- Classifications
- CWE-125, T1204.002, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 15, 2024CVE publishedPublication date reported by the CVE source.
- Feb 13, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=23.008.20470
- Affected versionversion=2020 <=20.005.30539
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.
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
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo