Researchers uncover rare, difficult-to-exploit OpenSSH vulnerability

Qualys disclosed a severe OpenSSH regression vulnerability (CVE-2024-6387, “RegreSSHion”) that can enable remote unauthenticated code execution and firewall bypass; it was a timing-issue fix reintroduced in 2020. Although Qualys estimates up to ~14 million vulnerable instances, the flaw is difficult to exploit, principally affects older 32‑bit Linux systems, no proof-of-concept or in-the-wild exploitation has been released, and many modern defenses reduce practical risk. Organizations should prioritize patching or mitigating exposed SSH services, particularly legacy 32-bit hosts.