A vulnerability exists within UltraVNC view due to a lack of proper stack memory buffer cleanup before constructing the ‘rfbTextChat’ message, which results in a leak of 3-bytes of stack memory. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of the UltraVNC Viewer process.
- Exodus Intelligence: EIP-5182fb5b
- MITRE CVE:
- CVSSv2 Score: 4.3
- Exodus Intelligence
- Disclosed to affected vendor: June 21th, 2021
- Disclosed to public: September 25th, 2021
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