Junos OS: Cross-Site Scripting (XSS) in J-Web

published 2020-01-15 6y ago modified 2026-06-17 4mo ago also EUVD-2020-12477

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.9%; EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits: 0; none known

Insufficient Cross-Site Scripting (XSS) protection in J-Web may potentially allow a remote attacker to inject web script or HTML, hijack the target user's J-Web session and perform administrative actions on the Junos device as the targeted user. This issue affects Juniper Networks Junos OS 12.3 versions prior to 12.3R12-S15; 12.3X48 versions prior to 12.3X48-D86, 12.3X48-D90 on SRX Series; 14.1X53 versions prior to 14.1X53-D51 on EX and QFX Series; 15.1F6 versions prior to 15.1F6-S13; 15.1 versions prior to 15.1R7-S5; 15.1X49 versions prior to 15.1X49-D181, 15.1X49-D190 on SRX Series; 15.1X53 versions prior to 15.1X53-D238 on QFX5200/QFX5110 Series; 15.1X53 versions prior to 15.1X53-D592 on EX2300/EX3400 Series; 16.1 versions prior to 16.1R4-S13, 16.1R7-S5; 16.2 versions prior to 16.2R2-S10; 17.1 versions prior to 17.1R2-S11, 17.1R3-S1; 17.2 versions prior to 17.2R1-S9, 17.2R3-S2; 17.3 versions prior to 17.3R2-S5, 17.3R3-S5; 17.4 versions prior to 17.4R2-S6, 17.4R3; 18.1 versions prior to 18.1R3-S7; 18.2 versions prior to 18.2R2-S5, 18.2R3; 18.3 versions prior to 18.3R1-S6, 18.3R2-S1, 18.3R3; 18.4 versions prior to 18.4R1-S5, 18.4R2; 19.1 versions prior to 19.1R1-S2, 19.1R2.

Patch / fix

fixed in 1

Juniper Networks Junos OS 12.3R12-S15, 12.3X48-D86, 12.3X48-D90, 14.1X53-D51, 15.1F6-S13, 15.1R7-S5, 15.1X49-D181, 15.1X49-D190, 15.1X53-D238, 15.1X53-D592, 16.1R4-S13, 16.1R7-S5, 16.2R2-S10, 17.1R2-S11, 17.1R3-S1, 17.2R1-S9, 17.2R3-S2, 17.3R2-S5, 17.3R3-S5, 17.4R2-S6, 17.4R3, 18.1R3-S7, 18.2R2-S5, 18.2R3, 18.3R1-S6, 18.3R2-S1, 18.3R3, 18.4R1-S5, 18.4R2, 19.1R1-S2, 19.1R2

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Exploit prediction

0.88% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

Juniper Networks Junos OS

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

kb.juniper.net /JSA10986
vendor-advisory

Sources

CVE List CVE-2020-1607
NVD CVE-2020-1607

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