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CVE-2020-29129

18
FAUCET Score

CVE-2020-29129 describes a buffer over-read vulnerability in the ncsi.c component of libslirp versions up to 4.3.1, affecting various Debian and Fedora distributions. This flaw occurs when the software attempts to read more header data than the total packet length. Rated as Medium severity (CVSS 4.3), the vulnerability has a network attack vector and low attack complexity, potentially leading to a limited disclosure of information. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion, and it is not listed on the CISA KEV catalog.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.3.1CPE matchmatch criteria
cpe:2.3:a:libslirp_project:libslirp:*:*:*:*:*:*:*:*
32CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
33CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.44%
Probability of exploitation in next 30 days
EPSS Percentile
70.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0144 is in the 84th percentile among its peer group of 21,939 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: virt-devel:rhel-8040020210317013608.9f9e2e7e
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: virt:rhel-8040020210317013608.9f9e2e7e
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: qemu-kvm
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: qemu-kvm-ma
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: qemu-kvm-rhev
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 8 Advanced VirtualizationFixed in: virt:8.3/qemu-kvm

Vendor Advisories (1)

redhatCVE-2020-29129Low

QEMU: slirp: out-of-bounds access while processing ARP/NCSI packets

Nov 26, 2020

References

lists.debian.org / debian-lts-announce/2022/09/msg00008.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/45S5IHSWYITJKMRT23HCHJQDI674AMTQ
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/OPCOHDEONMHH6QPJZKRLLCNRGRYODG7X
lists.freedesktop.org / archives/slirp/2020-November/000115.html
Mailing ListVendor Advisory
openwall.com / lists/oss-security/2020/11/27/1
Mailing ListThird Party Advisory