CVE-2021-43267

CRITICALEPSS 99th pctl

9.8

CVSS v3

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.

CWE-1284

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.84-1CVE-2021-43267

Fixed in:5.14.16-1CVE-2021-43267

linux-aws-5.11Ubuntu

Fixed in:5.11.0-1023.24~20.04.1USN-5208-1

linux-azure-5.11Ubuntu

Fixed in:5.11.0-1023.24~20.04.1USN-5208-1

linux-gcp-5.11Ubuntu

Fixed in:5.11.0-1024.26~20.04.1USN-5208-1

linux-hwe-5.11Ubuntu

Fixed in:5.11.0-44.48~20.04.2USN-5208-1

linux-image-5.10.0-1053-oemUbuntu

Fixed in:5.10.0-1053.55USN-5207-1

linux-image-5.11.0-1023-awsUbuntu

Fixed in:5.11.0-1023.24~20.04.1USN-5208-1

linux-image-5.11.0-1023-azureUbuntu

Fixed in:5.11.0-1023.24~20.04.1USN-5208-1

linux-image-5.11.0-1023-oracleUbuntu

Fixed in:5.11.0-1023.24~20.04.1USN-5208-1

linux-image-5.11.0-1024-gcpUbuntu

Fixed in:5.11.0-1024.26~20.04.1USN-5208-1

linux-image-5.11.0-44-genericUbuntu

Fixed in:5.11.0-44.48~20.04.2USN-5208-1

linux-image-5.11.0-44-generic-64kUbuntu

Fixed in:5.11.0-44.48~20.04.2USN-5208-1

linux-image-5.11.0-44-generic-lpaeUbuntu

Fixed in:5.11.0-44.48~20.04.2USN-5208-1

linux-image-5.11.0-44-lowlatencyUbuntu

Fixed in:5.11.0-44.48~20.04.2USN-5208-1

linux-image-5.13.0-1026-oemUbuntu

Fixed in:5.13.0-1026.32USN-5218-1

linux-image-5.14.0-1008-oemUbuntu

Fixed in:5.14.0-1008.8USN-5165-1

linux-image-awsUbuntu

Fixed in:5.11.0.1023.24~20.04.23USN-5208-1

linux-image-azureUbuntu

Fixed in:5.11.0.1023.24~20.04.23USN-5208-1

linux-image-gcpUbuntu

Fixed in:5.11.0.1024.26~20.04.24USN-5208-1

linux-image-generic-64k-hwe-20.04Ubuntu

Fixed in:5.11.0.44.48~20.04.22USN-5208-1

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.11.0.44.48~20.04.22USN-5208-1

linux-image-generic-lpae-hwe-20.04Ubuntu

Fixed in:5.11.0.44.48~20.04.22USN-5208-1

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.11.0.44.48~20.04.22USN-5208-1

linux-image-oem-20.04Ubuntu

Fixed in:5.10.0.1053.55USN-5207-1

linux-image-oem-20.04bUbuntu

Fixed in:5.10.0.1053.55USN-5207-1

linux-image-oem-20.04cUbuntu

Fixed in:5.13.0.1026.29USN-5218-1

linux-image-oem-20.04dUbuntu

Fixed in:5.14.0.1008.8USN-5165-1

linux-image-oracleUbuntu

Fixed in:5.11.0.1023.24~20.04.16USN-5208-1

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.11.0.44.48~20.04.22USN-5208-1

linux-oem-5.10Ubuntu

Fixed in:5.10.0-1053.55USN-5207-1

linux-oem-5.13Ubuntu

Fixed in:5.13.0-1026.32USN-5218-1

linux-oem-5.14Ubuntu

Fixed in:5.14.0-1008.8USN-5165-1

linux-oracle-5.11Ubuntu

Fixed in:5.11.0-1023.24~20.04.1USN-5208-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

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

Exploit Intelligence

57.58%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

References

Patch1

github.com

Exploit1

openwall.com

Vendor Advisory1

cdn.kernel.org

Third-Party Advisory1

security.netapp.com

Other references2

Related Vulnerabilities

Other CWE-1284 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-20699	Critical	10.0	72%	KEV	-
CVE-2022-31629	Medium	6.5	49%	-	Fix
CVE-2025-9316	Unscored	-	36%	-	-
CVE-2022-36620	High	7.5	23%	-	-
CVE-2008-1440	High	7.1	23%	-	-
CVE-2022-37134	Critical	9.8	21%	-	-

Common questions

How do I fix CVE-2021-43267?

Published advisories record a fix for 33 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2021-43267 being actively exploited?

Not that we know of. CVE-2021-43267 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 57.6% is the estimated probability that it will be exploited in the next 30 days. That is higher than 99% of all scored CVEs.

How severe is CVE-2021-43267?

CVE-2021-43267 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-43267 affect?

Published advisories record a fix for linux (Debian), linux-aws-5.11 (Ubuntu), linux-azure-5.11 (Ubuntu), linux-gcp-5.11 (Ubuntu), and 29 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.