Vulnerability intelligence
CVEs

CVE-2025-21590

Medium · 4.4KEVCWE-653Source: NVD

An Improper Isolation or Compartmentalization vulnerability in the kernel of Juniper Networks Junos OS allows a local attacker with high privileges to compromise the integrity of the device. A local attacker with access to the shell is able to inject arbitrary code which can compromise an affected device. This issue is not exploitable from the Junos CLI. This issue affects Junos OS:  * All versions before 21.2R3-S9, * 21.4 versions before 21.4R3-S10,  * 22.2 versions before 22.2R3-S6,  * 22.4 versions before 22.4R3-S6,  * 23.2 versions before 23.2R2-S3,  * 23.4 versions before 23.4R2-S4, * 24.2 versions before 24.2R1-S2, 24.2R2.

CVSS 3.1 4.4CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N Published 3/12/2025

Threat actors

UNC3886
Threat actor · China (state)
Curated

Six TINYSHELL backdoor variants on Junos MX routers; Veriexec bypass via memory injection.

Indicators of compromise

No indicators of compromise recorded. Run AI enrichment to research IOCs.
CISA KEV
Added 2025-03-13
Remediation due 2025-04-03
Ransomware use: Unknown
EPSS
2%

Probability of exploitation in the next 30 days.

Affected products
Public exploits / PoCs
No public PoC repositories found.
References