CVE-2021-3978: Cloudflare Octorpki

Medium severity, CVSS 5.5. EPSS: 0.1% chance of exploitation in the next 30 days.

When copying files with rsync, octorpki uses the "-a" flag 0, which forces rsync to copy binaries with the suid bit set as root. Since the provided service definition defaults to root ( https://github.com/cloudflare/cfrpki/blob/master/package/octorpki.service ) this could allow for a vector, when combined with another vulnerability that causes octorpki to process a malicious TAL file, for a local privilege escalation.

Affected products

• Cloudflare Octorpki: before 1.4.2 (fixed in 1.4.2)

Published 2025-01-29. Last modified 2026-06-17.