Tildeslash Monit Util_urlDecode Function Buffer Over-Read Vulnerability [CVE-2019-11455]

CVE Number – CVE-2019-11455

A vulnerability in Tildeslash Monit could allow an authenticated, remote attacker to access sensitive information or cause a denial of service (DoS) condition on a targeted system. The vulnerability exists in the Util_urlDecode function, as defined in the util.c source code file of the affected software. An attacker could exploit this vulnerability by manipulating the GET or POSTparameters on the targeted system. A successful exploit could trigger a buffer over-read condition, which could allow the attacker to access sensitive information or cause a DoS condition on the targeted system.Proof-of-concept (PoC) code that demonstrates an exploit of this vulnerability is publicly available. Tildeslash has confirmed the vulnerability and released software updates.


  • To exploit this vulnerability, the attacker must have user-level access to the targeted system. This access requirement could reduce the likelihood of a successful exploit.


  • Administrators are advised to apply the appropriate updates.Administrators are advised to allow only trusted users to have network access.Administrators are advised to run both firewall and antivirus applications to minimize the potential of inbound and outbound threats.Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.Administrators can help protect affected systems from external attacks by using a solid firewall strategy.Administrators are advised to monitor affected systems.

Vendor Announcements

  • Tildeslash released a git commit at the following link: commit f12d0cd

Fixed Software

  • Tildeslash released software updates at the following link: Monit 5.25.3

Duncan Newell

Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.

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