CVE-2020-8608

In libslirp 4.1.0, as used in QEMU 4.2.0, tcp_subr.c misuses snprintf return values, leading to a buffer overflow in later code.

Published: 2020-02-06 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-8608 is rated Moderate Risk (50.3/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.50%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-8608

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-12-20 1.81% 1.50% -0.31%
2 2025-11-21 4.55% 1.81% -2.74%
3 2025-11-18 — 4.55% —

Full EPSS history (20 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-8608

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.6 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 2.2 3.4 [email protected]
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2020-8608

OS Trackers for CVE-2020-8608

vendor priority summary link
debian not yet assigned CVE-2020-8608 not yet assigned priority: Debian including 4 source packages (libslirp, qemu, slirp, slirp4netns), 20 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 20. https://security-tracker.debian.org/tracker/CVE-2020-8608
gentoo normal CVE-2020-8608: 1 GLSA(s) (202003-66), 1 atom(s) (app-emulation/qemu); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-8608
redhat high — https://access.redhat.com/security/cve/CVE-2020-8608
suse high CVE-2020-8608 severity important: SUSE including 1164 source package names (0.45.0.7.7.1:qemu-5.2.0-17.1, 0.45.0.7.7.1:qemu-ipxe-1.0.0+-17.1, …), 1814 product×package rows across 94 product lines (Container suse/sle-micro-rancher/5.2, Container suse/sles/15.3/cdi-importer, … (94 product lines)): Fixed 1538, Known Affected 231, Known Not Affected 45. https://www.suse.com/security/cve/CVE-2020-8608/
ubuntu medium CVE-2020-8608 medium priority: Ubuntu including 5 source packages (libslirp, qemu, qemu-kvm, slirp, slirp4netns), 85 status rows across 17 suites (bionic, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 23, not-affected 23, released 19, ignored 10, needs-triage 6, needed 4. https://ubuntu.com/security/CVE-2020-8608

Affected software / configurations for CVE-2020-8608

Vendor Product Version Raw CPE
libslirp_project libslirp 4.1.0 cpe:2.3:a:libslirp_project:libslirp:4.1.0:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
opensuse leap 15.1 cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*

References for CVE-2020-8608

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00007.html Mailing List Third Party Advisory
https://gitlab.freedesktop.org/slirp/libslirp/-/tags/v4.1.0 Release Notes Third Party Advisory
https://gitlab.freedesktop.org/slirp/libslirp/commit/68ccb8021a838066f0951d4b2817eb6b6f10a843 Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/03/msg00015.html Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/03/msg00017.html Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00020.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00012.html Mailing List Third Party Advisory
https://security.gentoo.org/glsa/202003-66 Third Party Advisory
https://security.netapp.com/advisory/ntap-20201001-0002/ Third Party Advisory
https://usn.ubuntu.com/4283-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4733 Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/02/06/2 Mailing List Patch Third Party Advisory
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