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CVE-2024-39561

5.8 · MEDIUM

An Improper Check for Unusual or Exceptional Conditions vulnerability in the flow daemon (flowd) of Juniper Networks Junos OS on SRX4600 and SRX5000 Series allows an attacker to send TCP packet…

Published Jul 10, 2024CWE-754EPSS 0.31%

Overview

CVE-2024-39561 is a medium-severity vulnerability. It was published on July 10, 2024 and has a CVSS 3.1 base score of 5.8 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.8, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

An Improper Check for Unusual or Exceptional Conditions vulnerability in the flow daemon (flowd) of Juniper Networks Junos OS on

SRX4600 and SRX5000 Series

allows an attacker to send TCP packets with

SYN/FIN or SYN/RST

flags, bypassing the expected blocking of these packets.

A TCP packet with SYN/FIN or SYN/RST should be dropped in flowd. However, when no-syn-check and Express Path are enabled, these TCP packets are unexpectedly transferred to the downstream network.

This issue affects Junos OS on SRX4600 and SRX5000 Series:

* All versions before 21.2R3-S8,

* from 21.4 before 21.4R3-S7,

* from 22.1 before 22.1R3-S6,

* from 22.2 before 22.2R3-S4,

* from 22.3 before 22.3R3-S3,

* from 22.4 before 22.4R3-S2,

* from 23.2 before 23.2R2,

* from 23.4 before 23.4R1-S1, 23.4R2.

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

Refsupportportal.juniper.net/JSA83021Refsupportportal.juniper.net/JSA83021

How CyberStrike helps

Frequently asked questions

What is CVE-2024-39561?

CVE-2024-39561 is a medium-severity vulnerability. It was published on July 10, 2024 and has a CVSS 3.1 base score of 5.8 (MEDIUM).

How severe is CVE-2024-39561?

This vulnerability has a CVSS 3.1 base score of 5.8, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2024-39561?

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-2024-39561?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-39561 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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