CVE-2018-20839: systemd 242 changes the VT1 mode upon a logout, which allows attackers to read cleartext passwords in certa...

Security readout for executives and security teams

CVE-2018-20839 is a console password exposure issue in systemd 242. In certain virtual terminal logout or shutdown scenarios, cleartext passwords could become readable to someone watching or using the local console. This is mainly a local access risk, not a remote network takeover issue. Exposure is most relevant to Linux systems running systemd 242 or vendor packages containing this behavior. The bundle does not provide CPEs, a CVSS score, or a complete affected product matrix, so exposure should be confirmed through package inventory and vendor advisories. Treat this as a targeted local credential exposure risk. Prioritize shared servers, kiosks, lab systems, and infrastructure with broad console access. It is lower urgency than remotely exploitable flaws, but password exposure can materially increase account compromise risk. Mitigation focus: Check vendor advisories for fixed systemd packages or backports.; Update affected systemd packages through the operating system vendor.; Restrict physical and administrative console access to trusted users..

Prepared

Jun 6, 2026, 20:55 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.