CVE-2026-101983: Junos OS and Junos OS Evolved: An attacker causes remote code execution when J-Web virtual-domain is configured

Critical severity · published Oct 14, 2026

CVE-2026-101983

Junos OS and Junos OS Evolved: An attacker causes remote code execution when J-Web virtual-domain is configured

9.8

CVSS

0.5%

EPSS

On KEV

Description

A Stack-based Buffer Overflow vulnerability in the httpd process of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network attacker to cause remote code execution and denial of service via a J-Web virtual-domain configured.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack vector

Network

Complexity

Low

Privileges

None

User interaction

None

Confidentiality

High

Integrity

High

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.5% · higher than 45% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Junos OS · Juniper

23.4 before 23.4R2-S8.13; 24.2 before 24.2R2-S5.5; 24.4 before 24.4R2-S5; 25.2 before 25.2R2-S2; 25.4 before 25.4R1-S3; 26.2 before 26.2R1-S2 · source: vendor

Junos OS Evolved · Juniper Networks

23.4 before 23.4R2-S8.11-EVO; 24.2 before 24.2R2-S5.6-EVO; 24.4 before 24.4R2-S5-EVO; 25.2 before 25.2R2-S2-EVO; 25.4 before 25.4R1-S3-EVO; 26.2 before 26.2R1-S2-EVO; +3 more · source: vendor

Affected product

Junos OS

Juniper

All Junos OS CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-101983

CVE.org

https://www.cve.org/CVERecord?id=CVE-2026-101983

vendor-advisory

https://supportportal.juniper.net/JSA112187