Cesanta Mongoose mg_http_get_proto_data Function Use-After-Free Vulnerability [CVE-2018-20353]

CVE Number – CVE-2018-20353

A vulnerability in Cesanta Mongoose could allow an unauthenticated, remote attacker to execute arbitrary code or cause a denial of service (DoS) condition on a targeted system.The vulnerability is due to a use-after-free condition that exists in the mg_http_get_proto_datafunction of the affected software that occurs during a “NULL test”. An attacker could exploit this vulnerability by submitting crafted requests to the targeted system. A successful exploit could allow the attacker to execute arbitrary code or cause a DoS condition on a targeted system.The vendor has not confirmed the vulnerability, and software updates are not available.


  • To exploit this vulnerability, the attacker must send a request that submits malicious input to the targeted host system. This access requirement could reduce the likelihood of a successful exploit.


  • Administrators are advised to contact the vendor regarding future updates and releases.

    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

  • At the time this alert was first published, the vendor had not released a security advisory.

Fixed Software

  • At the time this alert was first published, the vendor had not released a software update.

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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