CVE-2021-3592

LOW

libslirp < 4.6.0 - Uninitialized Pointer Access in bootp_input Function

Title source: llm
STIX 2.1

Description

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.

References (8)

Core 8
Core References
Third Party Advisory vendor-advisory
https://security.gentoo.org/glsa/202107-44
Mailing List, Third Party Advisory mailing-list
https://lists.debian.org/debian-lts-announce/2021/09/msg00000.html
Issue Tracking, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1970484

Scores

CVSS v3 3.8
EPSS 0.0033
EPSS Percentile 24.1%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

Details

CWE
CWE-824
Status published
Products (5)
debian/debian_linux 9.0
fedoraproject/fedora 33
fedoraproject/fedora 34
libslirp_project/libslirp < 4.6.0
redhat/enterprise_linux 8.0 (2 CPE variants)
Published Jun 15, 2021
Tracked Since Feb 18, 2026