HOMEVULNERABILITIESCVE-2020-7039
MEDIUM

CVE-2020-7039

CWE-787Published: January 16, 2020· Updated: Jun 17, 2026

5.6
CVSS v3.1

Official Description

tcp_emu in tcp_subr.c in libslirp 4.1.0, as used in QEMU 4.2.0, mismanages memory, as demonstrated by IRC DCC commands in EMU_IRC. This can cause a heap-based buffer overflow or other out-of-bounds access which can lead to a DoS or potential execute arbitrary code.

NVD Source

Technical Analysis

CVE-2020-7039 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityLow
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected Vendors & Products

Debian1 product(s)
debian linux
libslirp_project1 product(s)
libslirp
openSUSE1 product(s)
leap
qemu1 product(s)
qemu
Source: NVD CPE · 5 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttp://www.openwall.com/lists/oss-security/2020/01/16/2
PATCHhttps://gitlab.freedesktop.org/slirp/libslirp/commit/2655fffed7a9e765bcb4701dd876e9dab975f289
PATCHhttps://gitlab.freedesktop.org/slirp/libslirp/commit/82ebe9c370a0e2970fb5695aa19aa5214a6a1c80
PATCHhttps://gitlab.freedesktop.org/slirp/libslirp/commit/ce131029d6d4a405cb7d3ac6716d03e58fb4a5d9
PATCHhttp://www.openwall.com/lists/oss-security/2020/01/16/2
PATCHhttps://gitlab.freedesktop.org/slirp/libslirp/commit/2655fffed7a9e765bcb4701dd876e9dab975f289
PATCHhttps://gitlab.freedesktop.org/slirp/libslirp/commit/82ebe9c370a0e2970fb5695aa19aa5214a6a1c80
PATCHhttps://gitlab.freedesktop.org/slirp/libslirp/commit/ce131029d6d4a405cb7d3ac6716d03e58fb4a5d9
ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2020-04/msg00007.html
ADVISORYhttps://access.redhat.com/errata/RHSA-2020:0348
ADVISORYhttps://access.redhat.com/errata/RHSA-2020:0775
ADVISORYhttps://lists.debian.org/debian-lts-announce/2020/01/msg00022.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2020/01/msg00036.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/02/msg00012.html
ADVISORYhttps://seclists.org/bugtraq/2020/Feb/0
ADVISORYhttps://security.gentoo.org/glsa/202005-02
ADVISORYhttps://usn.ubuntu.com/4283-1/
ADVISORYhttps://www.debian.org/security/2020/dsa-4616
ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2020-04/msg00007.html
ADVISORYhttps://access.redhat.com/errata/RHSA-2020:0348
ADVISORYhttps://access.redhat.com/errata/RHSA-2020:0775
ADVISORYhttps://lists.debian.org/debian-lts-announce/2020/01/msg00022.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2020/01/msg00036.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/02/msg00012.html
ADVISORYhttps://seclists.org/bugtraq/2020/Feb/0
ADVISORYhttps://security.gentoo.org/glsa/202005-02
ADVISORYhttps://usn.ubuntu.com/4283-1/
ADVISORYhttps://www.debian.org/security/2020/dsa-4616

All References (28)

→
http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00007.htmlThird Party Advisory
→
http://www.openwall.com/lists/oss-security/2020/01/16/2Mailing List · Patch · Third Party Advisory
→
https://access.redhat.com/errata/RHSA-2020:0348Third Party Advisory
→
https://access.redhat.com/errata/RHSA-2020:0775Third Party Advisory
→
https://gitlab.freedesktop.org/slirp/libslirp/commit/2655fffed7a9e765bcb4701dd876e9dab975f289Patch · Third Party Advisory
→
https://gitlab.freedesktop.org/slirp/libslirp/commit/82ebe9c370a0e2970fb5695aa19aa5214a6a1c80Patch · Third Party Advisory
→
https://gitlab.freedesktop.org/slirp/libslirp/commit/ce131029d6d4a405cb7d3ac6716d03e58fb4a5d9Patch · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2020/01/msg00022.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2020/01/msg00036.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2021/02/msg00012.htmlMailing List · Third Party Advisory
→
https://seclists.org/bugtraq/2020/Feb/0Mailing List · Third Party Advisory
→
https://security.gentoo.org/glsa/202005-02Third Party Advisory
→
https://usn.ubuntu.com/4283-1/Third Party Advisory
→
https://www.debian.org/security/2020/dsa-4616Third Party Advisory
→
http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00007.htmlThird Party Advisory

Quick Facts

CVE IDCVE-2020-7039
CVSS Score5.6 / 10
SeverityMEDIUM
WeaknessCWE-787
CISA KEVNo
Affected4 vendor(s)
PublishedJan 16, 2020

Related CVEs (CWE-787)

CVE-2013-5610
10.0
CVE-2018-3991
10.0
CVE-2002-2227
10.0
CVE-2012-0751
10.0
CVE-2018-2913
10.0
CVE-2019-5684
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-7039 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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