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Synthesis of the vulnerability 
An attacker can trigger a buffer overflow in string_vformat() in Exim, in order to trigger a denial of service, and possibly to run code.
 Vulnerable systems: Debian, Exim, Ubuntu.
Severity of this threat: 2/4.
Creation date: 30/09/2019.
Références of this weakness: 2449, CERTFR-2019-AVI-474, CVE-2019-16928, DSA-4536-1, USN-4141-1, VIGILANCE-VUL-30470.
Description of the vulnerability 
An attacker can trigger a buffer overflow in string_vformat() in Exim, in order to trigger a denial of service, and possibly to run code.
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This cybersecurity threat impacts software or systems such as Debian, Exim, Ubuntu.
Our Vigil@nce team determined that the severity of this computer threat note is medium.
The trust level is of type confirmed by the editor, with an origin of internet client.
An attacker with a expert ability can exploit this security threat.
Solutions for this threat 
Exim: version 4.92.3.
The version 4.92.3 is fixed:
https://ftp.exim.org/pub/exim/exim4/exim-4.92.3.tar.bz2
Debian 10: new exim4 packages.
New packages are available:
Debian 10: exim4 4.92-8+deb10u3
Ubuntu: new Exim packages.
New packages are available:
Ubuntu 19.04: exim4-daemon-heavy 4.92-4ubuntu1.4, exim4-daemon-light 4.92-4ubuntu1.4
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