What is CVE-2026-101983?

CVE-2026-101983 is a critical-severity vulnerability in Juniper Networks Junos OS, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-10-14.

How severe is CVE-2026-101983?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Juniper Networks Junos OS

CVE-2026-101983

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.

Vulnerability class: Buffer Overflow

Published 2026-10-14 · last modified 2026-10-14.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Juniper Networks Junos OS
Juniper Networks Junos OS Evolved — versions 23.4X100

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

supportportal.juniper.net/JSA112187 (vendor-advisory)

Frequently asked questions

What is CVE-2026-101983?: CVE-2026-101983 is a critical-severity vulnerability in Juniper Networks Junos OS, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-10-14.
How severe is CVE-2026-101983?: Critical severity. CVSS v3 base score is 9.8 out of 10.