What is CVE-2020-8608?

CVE-2020-8608 is a medium-severity vulnerability in Libslirp Project, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.6/10. Published 2020-02-06.

How severe is CVE-2020-8608?

Medium severity. CVSS v3 base score is 5.6 out of 10.

Is CVE-2020-8608 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Libslirp Project

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.

Vulnerability class: Buffer Overflow

Published 2020-02-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.025 (84.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 84.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000

Affected products

Libslirp Project — versions 4.1.0
Debian Linux — versions 8.0, 9.0, 10.0
openSUSE Leap — versions 15.1

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

qianfei11/QEMU-CVES

References

gitlab.freedesktop.org/slirp/libslirp/commit/68ccb8021a838066f0951d4b2817eb6b6f… (Patch, Third Party Advisory)
www.openwall.com/lists/oss-security/2020/02/06/2 (Patch, Mailing List, Third Party Advisory)
gitlab.freedesktop.org/slirp/libslirp/-/tags/v4.1.0 (Third Party Advisory, Release Notes)
usn.ubuntu.com/4283-1/ (vendor-advisory, Third Party Advisory)
lists.debian.org/debian-lts-announce/2020/03/msg00015.html (mailing-list, Third Party Advisory)
lists.debian.org/debian-lts-announce/2020/03/msg00017.html (mailing-list, Third Party Advisory)
security.gentoo.org/glsa/202003-66 (vendor-advisory, Third Party Advisory)
lists.opensuse.org/opensuse-security-announce/2020-04/msg00007.html (vendor-advisory, Mailing List, Third Party Advisory)
www.debian.org/security/2020/dsa-4733 (vendor-advisory, Third Party Advisory)
lists.debian.org/debian-lts-announce/2020/07/msg00020.html (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2020-8608?: CVE-2020-8608 is a medium-severity vulnerability in Libslirp Project, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.6/10. Published 2020-02-06.
How severe is CVE-2020-8608?: Medium severity. CVSS v3 base score is 5.6 out of 10.
Is CVE-2020-8608 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.