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Vulnerability · Published Oct 19, 2021 · Assigned by juniper

CVE-2021-31355Junos OS: Stored Cross-Site Scripting (XSS) vulnerability in captive portal

High 8.0

In plain English

A high-severity cross-site scripting in Junos OS from Juniper Networks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities).

Severity (CVSS 3.1)8.0High
Exploit odds (30 days)0.8%top 43.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

VendorProductVersions
Juniper Networks Junos OS 12.3X48 – before 12.3X48-D10515.1X49 – before 15.1X49-D22018.3 – before 18.3R3-S518.4 – before 18.4R3-S919.1 – before 19.1R3-S719.2 – before 19.2R3-S319.3 – before 19.3R3-S419.4 – before 19.4R3-S6

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

References