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Juniper fixes critical RCE in its SRX firewalls and EX switches (CVE-2024-21591)

Juniper Networks has fixed a critical pre-authentication remote code execution vulnerability in Junos OS on SRX firewalls and EX switches.

CVE-2024-21591 is an out-of-bounds write vulnerability that could allow an unauthenticated, network-based threat actor to carry out a denial-of service attack, an RCE attack, or gain root privileges on exposed devices.

“This issue is caused by use of an insecure function allowing an attacker to overwrite arbitrary memory,” Juniper Networks noted in the security advisory.

Admins are urged to patch their Junos OS instances on SRX or EX devices immediately.

Attackers frequently exploit vulnerabilities in Juniper networking devices to gain unauthorized access to systems within various organizations, often those of federal significance.

In November, CISA warned about five vulnerabilities that have been chained together by threat actors to compromise Juniper networking devices.

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