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Vulnerability of PuTTY: use after free via agent_response

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via agent_response of PuTTY, in order to trigger a denial of service, and possibly to run code.
Impacted systems: PuTTY, WinSCP.
Severity of this alert: 3/4.
Creation date: 29/06/2020.
Références of this alert: FSA-2020-2, VIGILANCE-VUL-32639.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via agent_response of PuT...
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This computer vulnerability alert impacts software or systems such as PuTTY, WinSCP.

Our Vigil@nce team determined that the severity of this computer threat alert is important.

The trust level is of type confirmed by the editor, with an origin of internet server.

An attacker with a expert ability can exploit this security vulnerability.

Solutions for this threat 

This vulnerability solution will be public soon.
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