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CVE-2024-12254

7.5 · HIGH

Starting in Python 3.12.0, the asyncio._SelectorSocketTransport.writelines() method would not "pause" writing and signal to the Protocol to drain the buffer to the wire once the write buffer reac…

Published Dec 6, 2024CWE-400EPSS 1.87%

Overview

CVE-2024-12254 is a high-severity vulnerability. It was published on December 6, 2024 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Starting in Python 3.12.0, the asyncio._SelectorSocketTransport.writelines()

method would not "pause" writing and signal to the Protocol to drain

the buffer to the wire once the write buffer reached the "high-water

mark". Because of this, Protocols would not periodically drain the write

buffer potentially leading to memory exhaustion.

This

vulnerability likely impacts a small number of users, you must be using

Python 3.12.0 or later, on macOS or Linux, using the asyncio module

with protocols, and using .writelines() method which had new

zero-copy-on-write behavior in Python 3.12.0 and later. If not all of

these factors are true then your usage of Python is unaffected.

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

GitHubgithub.com/python/cpython/commit/71e8429ac8e2adc10084ab5ec29a62f4b6671a82GitHubgithub.com/python/cpython/commit/9aa0deb2eef2655a1029ba228527b152353135b5GitHubgithub.com/python/cpython/commit/e991ac8f2037d78140e417cc9a9486223eb3e786GitHubgithub.com/python/cpython/issues/127655GitHubgithub.com/python/cpython/pull/127656Refmail.python.org/archives/list/[email protected]/thread/H4O3UBAOAQQXGT4RE3E4XQYR5XLROORB/Refwww.openwall.com/lists/oss-security/2024/12/06/1Refsecurity.netapp.com/advisory/ntap-20250404-0010/

How CyberStrike helps

Frequently asked questions

What is CVE-2024-12254?

CVE-2024-12254 is a high-severity vulnerability. It was published on December 6, 2024 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2024-12254?

This vulnerability has a CVSS 3.1 base score of 7.5, 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-2024-12254?

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-2024-12254?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-12254 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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