CVE-2024-21591

critical-risk

Published 2024-01-12

An Out-of-bounds Write vulnerability in J-Web of Juniper Networks Junos OS on SRX Series and EX Series allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS), or Remote Code Execution (RCE) and obtain root privileges on the device. This issue is caused by use of an insecure function allowing an attacker to overwrite arbitrary memory. This issue affects Juniper Networks Junos OS SRX Series and EX Series: * Junos OS versions earlier than 20.4R3-S9; * Junos OS 21.2 versions earlier than 21.2R3-S7; * Junos OS 21.3 versions earlier than 21.3R3-S5; * Junos OS 21.4 versions earlier than 21.4R3-S5; * Junos OS 22.1 versions earlier than 22.1R3-S4; * Junos OS 22.2 versions earlier than 22.2R3-S3; * Junos OS 22.3 versions earlier than 22.3R3-S2; * Junos OS 22.4 versions earlier than 22.4R2-S2, 22.4R3.

Do I need to act?

16.7% chance of exploitation in next 30 days

EPSS score — higher than 83% of all CVEs

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 9.8/10 Critical

NETWORK / LOW complexity

Affected Products (20)

Junos

Affected Vendors

Juniper

References (6)

Exploit https://curesec.com/blog/article/CVE-2024-21591_Juniper_Remote_Code_Exec.html

Vendor Advisory https://supportportal.juniper.net/JSA75729

Third Party Advisory https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H...

Exploit https://curesec.com/blog/article/CVE-2024-21591_Juniper_Remote_Code_Exec.html

Vendor Advisory https://supportportal.juniper.net/JSA75729

Third Party Advisory https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H...

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critical-risk

Severity 32/34 · Critical

Exploitability 13/34 · Low

Exposure 29/34 · Critical