CISA Issues Warning of Actively Exploited Plex Bug After LastPass Breach



The Cybersecurity and Infrastructure Security Agency (CISA) has issued a warning of an actively exploited vulnerability in Plex Media Server that allows attackers to execute arbitrary code. This alert comes just weeks after the LastPass password manager suffered a breach that exposed user email addresses and password reminders.

Overview of the Plex Media Server Vulnerability:

Plex Media Server is a popular media streaming service that allows users to access their media files from any device. However, CISA has discovered a critical vulnerability in the software that could allow attackers to take over the server and execute arbitrary code. The vulnerability is tracked as CVE-2021-37302 and has a CVSS score of 9.8 out of 10, indicating its criticality.

The vulnerability affects all versions of Plex Media Server before version 1.23.4. Despite the release of the security patch, many users may still be running older versions, leaving their systems vulnerable to attack.

Attackers are Actively Exploiting the Vulnerability:

CISA's warning states that attackers are actively exploiting the vulnerability in the wild, making it imperative for Plex Media Server users to upgrade to the latest version immediately. The exploitation of this vulnerability could result in the complete compromise of the server, leading to data theft, data destruction, and other malicious activities.

Impact of LastPass Breach:

The warning from CISA comes just weeks after LastPass suffered a data breach, exposing user email addresses and password reminders. The breach raised concerns over the security of password managers and the need for better protection of sensitive data.

Users who have used the same password for both their LastPass and Plex Media Server accounts may be at increased risk of compromise, as attackers could use the exposed LastPass data to gain access to their Plex Media Server accounts.

Mitigation Strategies:

To mitigate the risk of exploitation of the vulnerability in Plex Media Server, CISA recommends that users upgrade to version 1.23.4 or later immediately. Additionally, users should review their security posture and ensure they are following best practices, such as using unique and complex passwords for each account.

Organizations using Plex Media Server should also conduct a thorough security review of their systems and networks to identify any potential vulnerabilities and mitigate them as soon as possible.


The exploitation of vulnerabilities in popular software such as Plex Media Server highlights the need for constant vigilance and adherence to security best practices. Upgrading to the latest version of software, using strong and unique passwords, and conducting regular security assessments are essential to staying secure in an ever-evolving threat landscape.

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