HOME VULNERABILITIESCVE-2021-3506

HIGH

CVE-2021-3506

CWE-125Published: April 19, 2021· Updated: Jun 17, 2026

7.1

CVSS v3.1

Official Description

An out-of-bounds (OOB) memory access flaw was found in fs/f2fs/node.c in the f2fs module in the Linux kernel in versions before 5.12.0-rc4. A bounds check failure allows a local attacker to gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information. The highest threat from this vulnerability is to system availability.

Technical Analysis

CVE-2021-3506 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), availability disruption (denial of service), with a CVSS base score of 7.1.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges Req.Low

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityHigh

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

Affected Vendors & Products

Debian1 product(s)

debian linux

Linux1 product(s)

linux kernel

netapp18 product(s)

cloud backupsolidfire baseboard management controller firmwareh300s firmwareh300sh500s firmwareh500sh700s firmwareh700sh300e firmwareh300eh500e firmwareh500e+6

Source: NVD CPE · 21 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

PATCHhttp://www.openwall.com/lists/oss-security/2021/05/08/1

PATCHhttps://www.openwall.com/lists/oss-security/2021/03/28/2

PATCHhttp://www.openwall.com/lists/oss-security/2021/05/08/1

PATCHhttps://www.openwall.com/lists/oss-security/2021/03/28/2

ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=1944298

ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/06/msg00019.html

ADVISORYhttps://security.netapp.com/advisory/ntap-20210611-0007/

ADVISORYhttps://bugzilla.redhat.com/show_bug.cgi?id=1944298

ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/06/msg00019.html

ADVISORYhttps://security.netapp.com/advisory/ntap-20210611-0007/

All References (12)

→

http://www.openwall.com/lists/oss-security/2021/05/08/1Mailing List · Patch · Third Party Advisory

→

https://bugzilla.redhat.com/show_bug.cgi?id=1944298Issue Tracking · Third Party Advisory

→

https://lists.debian.org/debian-lts-announce/2021/06/msg00019.htmlMailing List · Third Party Advisory

→

https://security.netapp.com/advisory/ntap-20210611-0007/Third Party Advisory

→

https://www.mail-archive.com/linux-kernel%40vger.kernel.org/msg2520013.html

→

https://www.openwall.com/lists/oss-security/2021/03/28/2Mailing List · Patch · Third Party Advisory

→

http://www.openwall.com/lists/oss-security/2021/05/08/1Mailing List · Patch · Third Party Advisory

→

https://bugzilla.redhat.com/show_bug.cgi?id=1944298Issue Tracking · Third Party Advisory

→

https://lists.debian.org/debian-lts-announce/2021/06/msg00019.htmlMailing List · Third Party Advisory

→

https://security.netapp.com/advisory/ntap-20210611-0007/Third Party Advisory

→

https://www.mail-archive.com/linux-kernel%40vger.kernel.org/msg2520013.html

→

https://www.openwall.com/lists/oss-security/2021/03/28/2Mailing List · Patch · Third Party Advisory

Quick Facts

CVE IDCVE-2021-3506

CVSS Score7.1 / 10

SeverityHIGH

WeaknessCWE-125

CISA KEVNo

Affected3 vendor(s)

PublishedApr 19, 2021

Related CVEs (CWE-125)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2021-3506 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. CVE data is provided under the NVD usage policy.

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