A vulnerability in Apache Tomcat could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted system.
The vulnerability is due to a resource exhaustion condition in the HTTP/2 implementation of the affected software. An attacker could exploit this vulnerability by keeping streams that use the blocking I/O of the Servlet API open for requests. A successful exploit could result in a DoS condition on the targeted system.
Apache has confirmed the vulnerability and released software updates.
To exploit this vulnerability, the attacker must keep a stream open for requests to a targeted system, making exploitation difficult in environments
that restrict network access from untrusted sources.
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.
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.