XSS in Juniper Junos
CVE-2021-31355
A persistent cross-site scripting (XSS) vulnerability in the captive portal graphical user interface of Juniper Networks Junos OS may allow a remote authenticated user to inject web script or HTML and steal sensitive data and credentials from a web administration session, possibly tricking a follow-on administrative user to perform administrative actions on the device. This issue affects Juniper Networks Junos OS: All versions, including the following supported releases: 12.3X48 versions prior to 12.3X48-D105; 15.1X49 versions prior to 15.1X49-D220; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S7; 19.2 versions prior to 19.2R3-S3; 19.3 versions prior to 19.3R3-S4; 19.4 versions prior to 19.4R3-S6; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R1-S1, 20.2R2; 20.3 versions prior to 20.3R2; 20.4 versions prior to 20.4R2; 21.1 versions prior to 21.1R2.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.008 (53.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Juniper Junos — versions 12.3x48, 15.1x49, 18.3
- Juniper Networks Junos Os — versions 12.3X48, 15.1X49, 18.3
Weakness classification (CWE)
References
- sirt@juniper.net (x_refsource_CONFIRM, Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-31355?
- CVE-2021-31355 is a high-severity vulnerability in Juniper Junos, classified under Cross-site Scripting. CVSS score: 8.0/10. Published 2021-10-19.
- How severe is CVE-2021-31355?
- High severity. CVSS v3 base score is 8.0 out of 10.