CVE-2015-0501

Think of this like a disgruntled employee with a valid office key who can jam the photocopier so no one else can use it — they need legitimate access first, but once inside they can disrupt normal operations. Here, someone who already has a working database account could crash or freeze the database server, interrupting whatever applications depend on it.

This matters to you if you run MySQL Server, MariaDB, or use Linux distributions that bundle them (Debian, Ubuntu, Red Hat Enterprise Linux, SUSE Linux Enterprise), as well as Juniper Junos Space systems that rely on MySQL. This is only a risk if an attacker already has a valid database login — it is not exploitable by anonymous outsiders.

This requires an attacker to already hold valid database credentials, which significantly limits who can exploit it, and there is no confirmed exploitation in the wild or public exploit code. It still deserves a scheduled fix rather than emergency action — plan the upgrade in your normal patch cycle rather than treating it as a crisis.

Confirm exposure by checking the MySQL Server version (SELECT VERSION();) or your MariaDB version against 5.5.42 and 5.6.23 or earlier for MySQL, and pre-5.5.43 for MariaDB. Oracle's fix is bundled in the April 2015 Critical Patch Update: upgrade to MySQL 5.5.43 or 5.6.24 or later; MariaDB users should move to 5.5.43 or later. There is no documented breaking-change concern for this specific fix beyond standard point-release upgrade testing. As a temporary mitigation while scheduling the upgrade, restrict and audit accounts with remote login privileges, since exploitation requires an authenticated session — remove unused accounts and tighten privilege grants. This CVE is not in CISA's Known Exploited Vulnerabilities catalog, so there is no mandated remediation deadline. Monitor for unexpected server crashes or availability issues on affected instances, and track vendor advisories for downstream distributions (Debian, Ubuntu, RHEL, SUSE, Junos Space) which may ship patches on their own schedules.

CVSS 5.7 (AV:N/AC:M/Au:M/C:N/I:N/A:C) — network-exploitable but requiring authentication and medium attack complexity, with impact limited to availability (no data disclosure or modification). Weakness is unclassified (NVD-CWE-noinfo) and tied to the Server: Compiling subcomponent per Oracle's advisory. EPSS places this in the 96th percentile with a rising trend, indicating elevated predicted interest relative to other CVEs, though this is a prediction, not confirmed activity. No KEV listing and no public exploit code exist; exploit maturity is effectively theoretical/unverified at this time. Press attention is rising, likely due to its inclusion in the broader April 2015 Oracle CPU rather than standalone newsworthiness.