Vulnerability · Published Apr 22, 2021 · Assigned by juniper

CVE-2021-0275Junos OS: J-Web: Cross-site scripting attack allows an attacker to gain control of another users session.

High 8.8

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 1.2% (higher than 68% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)1.2%top 32.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

A Cross-site Scripting (XSS) vulnerability in J-Web on Juniper Networks Junos OS allows an attacker to target another user's session thereby gaining access to the users session. The other user session must be active for the attack to succeed. Once successful, the attacker has the same privileges as the user. If the user has root privileges, the attacker may be able to gain full control of the device. This issue affects: Juniper Networks Junos OS: 12.3 versions prior to 12.3R12-S15 on EX Series; 12.3X48 versions prior to 12.3X48-D95 on SRX Series; 15.1 versions prior to 15.1R7-S6 on EX Series; 15.1X49 versions prior to 15.1X49-D200 on SRX Series; 16.1 versions prior to 16.1R7-S7; 16.2 versions prior to 16.2R2-S11, 16.2R3; 17.1 versions prior to 17.1R2-S11, 17.1R3-S2; 17.2 versions prior to 17.2R3-S3; 17.3 versions prior to 17.3R2-S5, 17.3R3-S7; 17.4 versions prior to 17.4R2-S9, 17.4R3; 18.1 versions prior to 18.1R3-S9; 18.2 versions prior to 18.2R2-S7, 18.2R3-S3; 18.3 versions prior to 18.3R1-S7, 18.3R2-S3, 18.3R3-S1; 18.4 versions prior to 18.4R1-S6, 18.4R2-S4, 18.4R3; 19.1 versions prior to 19.1R2-S1, 19.1R3; 19.2 versions prior to 19.2R1-S3, 19.2R2; 19.3 versions prior to 19.3R2.

Affected products (as reported)

VendorProductVersions
Juniper Networks Junos OS 12.3 – before 12.3R12-S1515.1 – before 15.1R7-S6
Juniper Networks Junos OS 12.3X48 – before 12.3X48-D9515.1X49 – before 15.1X49-D200
Juniper Networks Junos OS 16.1 – before 16.1R7-S716.2 – before 16.2R2-S11, 16.2R317.1 – before 17.1R2-S11, 17.1R3-S217.2 – before 17.2R3-S317.3 – before 17.3R2-S5, 17.3R3-S717.4 – before 17.4R2-S9, 17.4R318.1 – before 18.1R3-S918.2 – before 18.2R2-S7, 18.2R3-S3

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

References