HOMEVULNERABILITIESCVE-2021-43267
CRITICAL

CVE-2021-43267

CWE-1284Published: November 2, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

An issue was discovered in net/tipc/crypto.c in the Linux kernel before 5.14.16. The Transparent Inter-Process Communication (TIPC) functionality allows remote attackers to exploit insufficient validation of user-supplied sizes for the MSG_CRYPTO message type.

NVD Source

Technical Analysis

CVE-2021-43267 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

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 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Fedora1 product(s)
fedora
Linux1 product(s)
linux kernel
netapp14 product(s)
h300s firmwareh300sh500s firmwareh500sh700s firmwareh700sh300e firmwareh300eh500e firmwareh500eh700e firmwareh700e+2
Source: NVD CPE · 17 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://github.com/torvalds/linux/commit/fa40d9734a57bcbfa79a280189799f76c88f7bb0
PATCHhttps://github.com/torvalds/linux/commit/fa40d9734a57bcbfa79a280189799f76c88f7bb0
ADVISORYhttp://www.openwall.com/lists/oss-security/2022/02/10/1
ADVISORYhttps://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.16
ADVISORYhttps://security.netapp.com/advisory/ntap-20211125-0002/
ADVISORYhttp://www.openwall.com/lists/oss-security/2022/02/10/1
ADVISORYhttps://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.16
ADVISORYhttps://security.netapp.com/advisory/ntap-20211125-0002/

All References (12)

→
http://www.openwall.com/lists/oss-security/2022/02/10/1Exploit · Mailing List · Third Party Advisory
→
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.16Mailing List · Release Notes · Vendor Advisory
→
https://github.com/torvalds/linux/commit/fa40d9734a57bcbfa79a280189799f76c88f7bb0Patch · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CVWL7HZV5T5OEKJPO2D67RMFMKBBXGGB/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RDDEW4APTYKJK365HC2JZIVXYUV7ZRN7/
→
https://security.netapp.com/advisory/ntap-20211125-0002/Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2022/02/10/1Exploit · Mailing List · Third Party Advisory
→
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.16Mailing List · Release Notes · Vendor Advisory
→
https://github.com/torvalds/linux/commit/fa40d9734a57bcbfa79a280189799f76c88f7bb0Patch · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CVWL7HZV5T5OEKJPO2D67RMFMKBBXGGB/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RDDEW4APTYKJK365HC2JZIVXYUV7ZRN7/
→
https://security.netapp.com/advisory/ntap-20211125-0002/Third Party Advisory

Quick Facts

CVE IDCVE-2021-43267
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-1284
CISA KEVNo
Affected3 vendor(s)
PublishedNov 2, 2021

Related CVEs (CWE-1284)

CVE-2026-49777
KEV10.0
CVE-2026-25345
9.9
CVE-2008-2374
9.8
CVE-2025-55398
9.8
CVE-2022-20385
9.8
CVE-2022-37134
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-43267 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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