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Vulnerability record · CVE-2020-29129 · published 26 November 2020

CVE-2020-29129: Libslirp project libslirp out-of-bounds read vulnerability

LLibslirp Project · Libslirp

ncsi.c in libslirp through 4.3.1 has a buffer over-read because it tries to read a certain amount of header data even if that exceeds the total packet length.

4.3 CVSS 3.1 Medium EPSS 1.5% · top 27.5% CWE-125 · Out-of-bounds read
4.3CVSS 3.1 base score, v2 4.0
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

ncsi.c in libslirp through 4.3.1 has a buffer over-read because it tries to read a certain amount of header data even if that exceeds the total packet length.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2020/11/27/1 Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/45S5IHSWYITJKMRT23HCHJQ
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPCOHDEONMHH6QPJZKRLLCN
https://lists.freedesktop.org/archives/slirp/2020-November/000115.html Mailing ListVendor Advisory
http://www.openwall.com/lists/oss-security/2020/11/27/1 Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/45S5IHSWYITJKMRT23HCHJQ
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPCOHDEONMHH6QPJZKRLLCN
https://lists.freedesktop.org/archives/slirp/2020-November/000115.html Mailing ListVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-29129), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.