CVE-2021-3592: Debian Linux

Low severity, CVSS 3.8. EPSS: 0.3% chance of exploitation in the next 30 days.

An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the bootp_input() function and could occur while processing a udp packet that is smaller than the size of the 'bootp_t' structure. A malicious guest could use this flaw to leak 10 bytes of uninitialized heap memory from the host. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0.

Affected products

• Debian Debian Linux: version 9.0 only
• Fedoraproject Fedora: version 33 only; version 34 only
• Libslirp Project Libslirp: before 4.6.0 (fixed in 4.6.0)
• Red Hat Enterprise Linux: version 8.0 only

Published 2021-06-15. Last modified 2026-06-17.