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CVE-2021-47244

8.2 · HIGH

In the Linux kernel, the following vulnerability has been resolved: mptcp: Fix out of bounds when parsing TCP options The TCP option parser in mptcp (mptcp_get_options) could read one byte out of…

Published May 21, 2024CWE-125EPSS 0.72%

Overview

CVE-2021-47244 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

mptcp: Fix out of bounds when parsing TCP options

The TCP option parser in mptcp (mptcp_get_options) could read one byte

out of bounds. When the length is 1, the execution flow gets into the

loop, reads one byte of the opcode, and if the opcode is neither

TCPOPT_EOL nor TCPOPT_NOP, it reads one more byte, which exceeds the

length of 1.

This fix is inspired by commit 9609dad263f8 ("ipv4: tcp_input: fix stack

out of bounds when parsing TCP options.").

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/07718be265680dcf496347d475ce1a5442f55ad7Refgit.kernel.org/stable/c/73eeba71dc9932970befa009e68272a3d5ec4a58Refgit.kernel.org/stable/c/76e02b8905d0691e89e104a882f3bba7dd0f6037Refgit.kernel.org/stable/c/07718be265680dcf496347d475ce1a5442f55ad7Refgit.kernel.org/stable/c/73eeba71dc9932970befa009e68272a3d5ec4a58Refgit.kernel.org/stable/c/76e02b8905d0691e89e104a882f3bba7dd0f6037

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47244?

CVE-2021-47244 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2021-47244?

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-47244?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47244?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47244 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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