CVE-2017-5640: Apache Impala

Critical severity, CVSS 9.8. EPSS: 2.9% chance of exploitation in the next 30 days.

It was noticed that a malicious process impersonating an Impala daemon in Apache Impala (incubating) 2.7.0 to 2.8.0 could cause Impala daemons to skip authentication checks when Kerberos is enabled (but TLS is not). If the malicious server responds with 'COMPLETE' before the SASL handshake has completed, the client will consider the handshake as completed even though no exchange of credentials has happened.

Affected products

• Apache Impala: version 2.7.0 only; version 2.8.0 only

Published 2017-07-10. Last modified 2026-06-17.