CVE-2015-7754: Juniper ScreenOS before 6.3.0r21, when ssh-pka is configured and enabled, allows remote attackers to cause a d

Q: How do I fix CVE-2015-7754?

screenos: upgrade to newer than 6.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2015-7754 being exploited?

CVE-2015-7754 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2015-7754 affect?

CVE-2015-7754 affects screenos. Severity is high (CVSS 8.1). Juniper ScreenOS before 6.3.0r21, when ssh-pka is configured and enabled, allows remote attackers to cause a denial of service (system crash) or execute arbitrary code via crafted SSH negotiation.

Q: How urgent is CVE-2015-7754?

Priority 56/100. High severity; EPSS top 10%: very likely to be exploited; Remotely exploitable, no login, no user action

This month

HIGH 8.1REMOTEUPGRADE

CVE-2015-7754 is a high-severity flaw (CVSS 8.1) affecting screenos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Juniper ScreenOS before 6.3.0r21, when ssh-pka is configured and enabled, allows remote attackers to cause a denial of service (system crash) or execute arbitrary code via crafted SSH negotiation.

Why this priority

High severity
EPSS top 10%: very likely to be exploited
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	3.9% (top 10%)
CISA exploited list	No
Weakness	CWE-20
Published	2016-01-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: juniper

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

Am I affected?

Timeline

2016-01-08 19:59 UTCPublished CVE record published
2026-06-17 00:33 UTCUpdated Record last modified

juniper screenos UPGRADE

Affected: <= 6.3.0

Fixed in: newer than 6.3.0

Safe to downgrade to: no unaffected older release

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-2015-7754?

screenos: upgrade to newer than 6.3.0. Exact commands for each OS are on this page.

Is CVE-2015-7754 being exploited?

CVE-2015-7754 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-2015-7754 affect?

CVE-2015-7754 affects screenos. Severity is high (CVSS 8.1). Juniper ScreenOS before 6.3.0r21, when ssh-pka is configured and enabled, allows remote attackers to cause a denial of service (system crash) or execute arbitrary code via crafted SSH negotiation.

How urgent is CVE-2015-7754?

Priority 56/100. High severity; EPSS top 10%: very likely to be exploited; Remotely exploitable, no login, no user action

Software pages

Juniper Junos vulnerabilities

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CVE-2017-2337 HIGH 8.4 MITIGATE A persistent cross site scripting vulnerability in NetScreen WebUI of Juniper Networks Juniper NetScreen Firew
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References

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