CVE-2021-3594

An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp_input() function and could occur while processing a udp packet that is smaller than the size of the 'udphdr' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0.

• CWE-824

• https://bugzilla.redhat.com/show_bug.cgi?id=1970491Issue Tracking, Patch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2021/09/msg00000.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2023/03/msg00013.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GCKWZWY64EHTOQMLVLTSZ4AA27EWRJMH/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SGPQZFVJCFGDSISFXPCQTTBBD7QZLJKI/
• https://security.gentoo.org/glsa/202107-44Third Party Advisory
• https://security.netapp.com/advisory/ntap-20210805-0004/Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1970491Issue Tracking, Patch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2021/09/msg00000.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2023/03/msg00013.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GCKWZWY64EHTOQMLVLTSZ4AA27EWRJMH/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SGPQZFVJCFGDSISFXPCQTTBBD7QZLJKI/
• https://security.gentoo.org/glsa/202107-44Third Party Advisory
• https://security.netapp.com/advisory/ntap-20210805-0004/Third Party Advisory

Published

Jun 15, 2021

Last Modified

Jun 17, 2026

Status

Modified

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