CVE-2015-7750: The L2TP packet processing functionality in Juniper Netscreen and ScreenOS Firewall products with ScreenOS bef

Q: How do I fix CVE-2015-7750?

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

Q: Is CVE-2015-7750 being exploited?

CVE-2015-7750 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-2015-7750 affect?

CVE-2015-7750 affects screenos. Severity is medium (CVSS 5.0). The L2TP packet processing functionality in Juniper Netscreen and ScreenOS Firewall products with ScreenOS before 6.3.0r13-dnd1, 6.3.0r14 through 6.3.0r18 before 6.3.0r18-dnc1, and 6.3.0r19 allows remote attackers to cause a denial of servi

Q: How urgent is CVE-2015-7750?

Priority 38/100. No elevated risk signals yet.

Routine

MEDIUM 5.0UPGRADE

CVE-2015-7750 is a medium-severity flaw (CVSS 5.0) affecting screenos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The L2TP packet processing functionality in Juniper Netscreen and ScreenOS Firewall products with ScreenOS before 6.3.0r13-dnd1, 6.3.0r14 through 6.3.0r18 before 6.3.0r18-dnc1, and 6.3.0r19 allows remote attackers to cause a denial of service via a crafted L2TP packet.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	2.0% (top 19%)
CISA exploited list	No
Weakness	CWE-20
Published	2015-10-19
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

2015-10-19 18:59 UTCPublished CVE record published
2026-06-17 00:33 UTCUpdated Record last modified

juniper screenos UPGRADE

Affected: <= 6.3.0 · 6.3.0 · 6.3.0 r14 · 6.3.0 r15 · 6.3.0 r16 · 6.3.0 r17 · 6.3.0 r18 · 6.3.0 r19

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-2015-7750?

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

Is CVE-2015-7750 being exploited?

CVE-2015-7750 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-2015-7750 affect?

CVE-2015-7750 affects screenos. Severity is medium (CVSS 5.0). The L2TP packet processing functionality in Juniper Netscreen and ScreenOS Firewall products with ScreenOS before 6.3.0r13-dnd1, 6.3.0r14 through 6.3.0r18 before 6.3.0r18-dnc1, and 6.3.0r19 allows remote attackers to cause a denial of servi

How urgent is CVE-2015-7750?

Priority 38/100. No elevated risk signals yet.

Software pages

Juniper Junos vulnerabilities

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References

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