Remote code execution via oversized cursor dimensions
Published Jan 24, 2025 · Updated Jan 24, 2025
Heap buffer overflow in LibVNCServer 0.9.12 and earlier allows remote attackers to execute code through a crafted VNC cursor shape. HandleCursorShape processes attacker-controlled width and height values without a size limit before allocating and filling cursor buffers, causing a heap overflow. A user must connect a LibVNCClient-based application to an attacker-controlled VNC server, after which code executes in that application's context.
Summary
What happened
Heap buffer overflow in LibVNCServer 0.9.12 and earlier allows remote attackers to execute code through a crafted VNC cursor shape. HandleCursorShape processes attacker-controlled width and height values without a size limit before allocating and filling cursor buffers, causing a heap overflow. A user must connect a LibVNCClient-based application to an attacker-controlled VNC server, after which code executes in that application's context.
The record
- CVE
- CVE-2019-15690
- Published
- Jan 24, 2025
- Updated
- Jan 24, 2025
- Vendor
- LibVNC
- Product
- LibVNCServer
- Classifications
- CWE-122, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 24, 2025CVE publishedPublication date reported by the CVE source.
- Jan 24, 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=* <=0.9.12
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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