HOME VULNERABILITIESCVE-2020-35505

MEDIUM

CVE-2020-35505

CWE-476Published: May 28, 2021· Updated: Jun 17, 2026

4.4

CVSS v3.1

Official Description

A NULL pointer dereference flaw was found in the am53c974 SCSI host bus adapter emulation of QEMU in versions before 6.0.0. This issue occurs while handling the 'Information Transfer' command. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

Technical Analysis

CVE-2020-35505 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 availability disruption (denial of service), with a CVSS base score of 4.4.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges Req.High

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Debian1 product(s)

debian linux

qemu1 product(s)

qemu

Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

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=1909769

PATCHhttps://www.openwall.com/lists/oss-security/2021/04/16/3

PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=1909769

PATCHhttps://www.openwall.com/lists/oss-security/2021/04/16/3

ADVISORYhttp://www.openwall.com/lists/oss-security/2021/04/16/3

ADVISORYhttps://lists.debian.org/debian-lts-announce/2022/09/msg00008.html

ADVISORYhttps://security.gentoo.org/glsa/202208-27

ADVISORYhttps://security.netapp.com/advisory/ntap-20210713-0006/

ADVISORYhttp://www.openwall.com/lists/oss-security/2021/04/16/3

ADVISORYhttps://lists.debian.org/debian-lts-announce/2022/09/msg00008.html

ADVISORYhttps://security.gentoo.org/glsa/202208-27

ADVISORYhttps://security.netapp.com/advisory/ntap-20210713-0006/

All References (12)

→

http://www.openwall.com/lists/oss-security/2021/04/16/3Mailing List · Third Party Advisory

→

https://bugzilla.redhat.com/show_bug.cgi?id=1909769Issue Tracking · Patch · Third Party Advisory

→

https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing List · 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 · Patch · 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=1909769Issue Tracking · Patch · Third Party Advisory

→

https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing List · 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 · Patch · Third Party Advisory

Quick Facts

CVE IDCVE-2020-35505

CVSS Score4.4 / 10

SeverityMEDIUM

WeaknessCWE-476

CISA KEVNo

Affected2 vendor(s)

PublishedMay 28, 2021

Related CVEs (CWE-476)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2020-35505 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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