HOMEVULNERABILITIESCVE-2023-4135
MEDIUM

CVE-2023-4135

CWE-125Published: August 4, 2023· Updated: Jun 17, 2026

6.5
CVSS v3.1

Official Description

A heap out-of-bounds memory read flaw was found in the virtual nvme device in QEMU. The QEMU process does not validate an offset provided by the guest before computing a host heap pointer, which is used for copying data back to the guest. Arbitrary heap memory relative to an allocated buffer can be disclosed.

NVD Source

Technical Analysis

CVE-2023-4135 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.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 6.5.

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
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Affected Vendors & Products

Fedora1 product(s)
fedora
qemu1 product(s)
qemu
Source: NVD CPE · 3 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=2229101
PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=2229101
ADVISORYhttps://access.redhat.com/security/cve/CVE-2023-4135
ADVISORYhttps://security.netapp.com/advisory/ntap-20230915-0012/
ADVISORYhttps://www.zerodayinitiative.com/advisories/ZDI-CAN-21521
ADVISORYhttps://access.redhat.com/security/cve/CVE-2023-4135
ADVISORYhttps://security.netapp.com/advisory/ntap-20230915-0012/
ADVISORYhttps://www.zerodayinitiative.com/advisories/ZDI-CAN-21521

All References (8)

→
https://access.redhat.com/security/cve/CVE-2023-4135Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=2229101Issue Tracking · Patch · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20230915-0012/Third Party Advisory
→
https://www.zerodayinitiative.com/advisories/ZDI-CAN-21521Broken Link · Third Party Advisory · VDB Entry
→
https://access.redhat.com/security/cve/CVE-2023-4135Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=2229101Issue Tracking · Patch · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20230915-0012/Third Party Advisory
→
https://www.zerodayinitiative.com/advisories/ZDI-CAN-21521Broken Link · Third Party Advisory · VDB Entry

Quick Facts

CVE IDCVE-2023-4135
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-125
CISA KEVNo
Affected2 vendor(s)
PublishedAug 4, 2023

Related CVEs (CWE-125)

CVE-2013-0767
10.0
CVE-2009-2523
10.0
CVE-2021-41556
10.0
CVE-2017-14451
10.0
CVE-2021-21777
10.0
CVE-2023-26489
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-4135 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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