CVE-2017-2336: A reflected cross site scripting vulnerability in NetScreen WebUI of Juniper Networks Juniper NetScreen Firewa

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CRITICAL 9.6MITIGATE

CVE-2017-2336 is a critical-severity flaw (CVSS 9.6) affecting screenos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A reflected cross site scripting vulnerability in NetScreen WebUI of Juniper Networks Juniper NetScreen Firewall+VPN running ScreenOS allows a network based attacker to inject HTML/JavaScript content into the management session of other users including the administrator. This enables the attacker to effectively execute commands with the permissions of an administrator. This issue affects Juniper Networks ScreenOS 6.3.0 releases prior to 6.3.0r24

Why this priority

Critical severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.2% (top 32%)
CISA exploited list	No
Weakness	CWE-79
Published	2017-07-17
Last modified	2026-06-17

Publisher (CNA): Juniper Networks, Inc. · Vendor: juniper

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2017-07-17 13:18 UTCPublished CVE record published
2026-06-17 01:15 UTCUpdated Record last modified

juniper screenos MITIGATE

Affected: 6.3.0 · 6.3.0 r1 · 6.3.0 r10 · 6.3.0 r11 · 6.3.0 r12 · 6.3.0 r13 · 6.3.0 r14 · 6.3.0 r15

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.3.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2017-2336?

screenos: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-2336 being exploited?

CVE-2017-2336 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2017-2336 affect?

CVE-2017-2336 affects screenos. Severity is critical (CVSS 9.6). A reflected cross site scripting vulnerability in NetScreen WebUI of Juniper Networks Juniper NetScreen Firewall+VPN running ScreenOS allows a network based attacker to inject HTML/JavaScript content into the management session of other use

How urgent is CVE-2017-2336?

Priority 51/100. Critical severity

Software pages

Juniper Junos vulnerabilities

Related CVEs

CVE-2018-0014 MEDIUM 4.3 MITIGATE Juniper Networks ScreenOS devices do not pad Ethernet packets with zeros, and thus some packets can contain fr
CVE-2017-2339 HIGH 8.4 MITIGATE A persistent cross site scripting vulnerability in NetScreen WebUI of Juniper Networks Juniper NetScreen Firew
CVE-2017-2338 HIGH 8.4 MITIGATE A persistent cross site scripting vulnerability in NetScreen WebUI of Juniper Networks Juniper NetScreen Firew
CVE-2017-2337 HIGH 8.4 MITIGATE A persistent cross site scripting vulnerability in NetScreen WebUI of Juniper Networks Juniper NetScreen Firew
CVE-2017-2335 HIGH 8.4 MITIGATE A persistent cross site scripting vulnerability in NetScreen WebUI of Juniper Networks Juniper NetScreen Firew

References

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