CVE-2026-101983
Critical
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.
SeverityCritical
CVSS9.8
Exploit probability—
ProductJunos OS
PublishedOct 14, 2026
First seenOct 14, 2026
Weakness typeCWE-121CWE-121
How to fix
Update
- Juniper Networks Junos OS23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, 26.2R1-S2 or later
- Juniper Networks Junos OS Evolved23.4R2-S8.11-EVO, 24.2R2-S5.6-EVO, 24.4R2-S5-EVO, 25.2R2-S2-EVO, 25.4R1-S3-EVO, 26.2R1-S2-EVO, 25.2X100-D35-EVO, 25.4X300-D40-EVO or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Juniper Networks Junos OS | 23.4 ≤ v < 23.4R2-S8.13, 24.2 ≤ v < 24.2R2-S5.5, 24.4 ≤ v < 24.4R2-S5, 25.2 ≤ v < 25.2R2-S2, 25.4 ≤ v < 25.4R1-S3, 26.2 ≤ v < 26.2R1-S2 | 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3, 26.2R1-S2 |
| Juniper Networks Junos OS Evolved | 23.4 ≤ v < 23.4R2-S8.11-EVO, 24.2 ≤ v < 24.2R2-S5.6-EVO, 24.4 ≤ v < 24.4R2-S5-EVO, 25.2 ≤ v < 25.2R2-S2-EVO, 25.4 ≤ v < 25.4R1-S3-EVO, 26.2 ≤ v < 26.2R1-S2-EVO, 23.4X100, 25.2X100 ≤ v < 25.2X100-D35-EVO, 25.4X300 ≤ v < 25.4X300-D40-EVO | 23.4R2-S8.11-EVO, 24.2R2-S5.6-EVO, 24.4R2-S5-EVO, 25.2R2-S2-EVO, 25.4R1-S3-EVO, 26.2R1-S2-EVO, 25.2X100-D35-EVO, 25.4X300-D40-EVO |
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