HOMEVULNERABILITIESCVE-2020-35506
MEDIUM

CVE-2020-35506

CWE-416Published: May 28, 2021· Updated: Jun 17, 2026

6.7
CVSS v3.1

Official Description

A use-after-free vulnerability was found in the am53c974 SCSI host bus adapter emulation of QEMU in versions before 6.0.0 during the handling of the 'Information Transfer' command (CMD_TI). This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service or potential code execution with the privileges of the QEMU process.

NVD Source

Technical Analysis

CVE-2020-35506 requires local access, meaning attackers must already have a foothold on the target system.

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

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 6.7.

From a weakness classification perspective (CWE-416): Use-after-free vulnerabilities involve accessing memory after it has been freed, often enabling arbitrary code execution.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.High
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

qemu1 product(s)
qemu
Source: NVD CPE · 1 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

ADVISORYhttp://www.openwall.com/lists/oss-security/2021/04/16/3
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=1909996
ADVISORYhttps://security.gentoo.org/glsa/202208-27
ADVISORYhttps://security.netapp.com/advisory/ntap-20210713-0006/
ADVISORYhttps://www.openwall.com/lists/oss-security/2021/04/16/3
ADVISORYhttp://www.openwall.com/lists/oss-security/2021/04/16/3
ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=1909996
ADVISORYhttps://security.gentoo.org/glsa/202208-27
ADVISORYhttps://security.netapp.com/advisory/ntap-20210713-0006/
ADVISORYhttps://www.openwall.com/lists/oss-security/2021/04/16/3

All References (10)

→
http://www.openwall.com/lists/oss-security/2021/04/16/3Mailing List · Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=1909996Issue Tracking · Third Party Advisory
→
https://security.gentoo.org/glsa/202208-27Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20210713-0006/Third Party Advisory
→
https://www.openwall.com/lists/oss-security/2021/04/16/3Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2021/04/16/3Mailing List · Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=1909996Issue Tracking · Third Party Advisory
→
https://security.gentoo.org/glsa/202208-27Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20210713-0006/Third Party Advisory
→
https://www.openwall.com/lists/oss-security/2021/04/16/3Mailing List · Third Party Advisory

Quick Facts

CVE IDCVE-2020-35506
CVSS Score6.7 / 10
SeverityMEDIUM
WeaknessCWE-416
CISA KEVNo
Affected1 vendor(s)
PublishedMay 28, 2021

Related CVEs (CWE-416)

CVE-2012-1972
10.0
CVE-2012-1974
10.0
CVE-2024-43102
10.0
CVE-2010-3116
10.0
CVE-2012-1973
10.0
CVE-2012-1975
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-35506 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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