Memory disclosure or crash via oversized SVG numbers
Published Aug 22, 2022 · Updated Aug 3, 2024
An out-of-bounds read in Qt Framework allows attackers to disclose process memory or crash an application by opening a crafted SVG file. The SVG handler accepts numeric values that remain normal doubles but cannot be represented as normal floats, then passes them into radial-gradient raster calculations that index beyond valid memory in QRadialFetchSimd. Exploitation requires a user or application workflow to render attacker-supplied SVG content; the reported effects are memory disclosure and application crash.
Summary
What happened
An out-of-bounds read in Qt Framework allows attackers to disclose process memory or crash an application by opening a crafted SVG file. The SVG handler accepts numeric values that remain normal doubles but cannot be represented as normal floats, then passes them into radial-gradient raster calculations that index beyond valid memory in QRadialFetchSimd. Exploitation requires a user or application workflow to render attacker-supplied SVG content; the reported effects are memory disclosure and application crash.
The record
- CVE
- CVE-2021-3481
- Published
- Aug 22, 2022
- Updated
- Aug 3, 2024
- Vendor
- The Qt Company
- Product
- Qt Framework
- Classifications
- CWE-125
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 22, 2022CVE publishedPublication date reported by the CVE source.
- Aug 3, 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=Fixed in qt 5.12.11, qt 5.15.4, qt 6.0.3, qt 6.1.0RC.
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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