HOMEVULNERABILITIESCVE-2021-3592
LOW

CVE-2021-3592

CWE-824Published: June 15, 2021· Updated: Jun 17, 2026

3.8
CVSS v3.1

Official Description

An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the bootp_input() function and could occur while processing a udp packet that is smaller than the size of the 'bootp_t' structure. A malicious guest could use this flaw to leak 10 bytes of uninitialized heap memory from the host. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0.

NVD Source

Technical Analysis

CVE-2021-3592 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeChanged
Impact
ConfidentialityLow
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

Affected Vendors & Products

Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
libslirp_project1 product(s)
libslirp
Red Hat1 product(s)
enterprise linux
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

PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=1970484
PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=1970484
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/09/msg00000.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/09/msg00004.html
ADVISORYhttps://security.gentoo.org/glsa/202107-44
ADVISORYhttps://security.netapp.com/advisory/ntap-20210805-0004/
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/09/msg00000.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/09/msg00004.html
ADVISORYhttps://security.gentoo.org/glsa/202107-44
ADVISORYhttps://security.netapp.com/advisory/ntap-20210805-0004/

All References (16)

→
https://bugzilla.redhat.com/show_bug.cgi?id=1970484Issue Tracking · Patch · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2021/09/msg00000.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2021/09/msg00004.htmlThird Party Advisory
→
https://lists.debian.org/debian-lts-announce/2023/03/msg00013.html
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GCKWZWY64EHTOQMLVLTSZ4AA27EWRJMH/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SGPQZFVJCFGDSISFXPCQTTBBD7QZLJKI/
→
https://security.gentoo.org/glsa/202107-44Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20210805-0004/Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=1970484Issue Tracking · Patch · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2021/09/msg00000.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2021/09/msg00004.htmlThird Party Advisory
→
https://lists.debian.org/debian-lts-announce/2023/03/msg00013.html
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GCKWZWY64EHTOQMLVLTSZ4AA27EWRJMH/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SGPQZFVJCFGDSISFXPCQTTBBD7QZLJKI/
→
https://security.gentoo.org/glsa/202107-44Third Party Advisory

Quick Facts

CVE IDCVE-2021-3592
CVSS Score3.8 / 10
SeverityLOW
WeaknessCWE-824
CISA KEVNo
Affected4 vendor(s)
PublishedJun 15, 2021

Related CVEs (CWE-824)

CVE-2007-2442
10.0
CVE-2009-0846
10.0
CVE-2020-17446
9.8
CVE-2017-12561
9.8
CVE-2018-14356
9.8
CVE-2021-36219
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-3592 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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