CVE-2015-7750
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedThe 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceA vulnerability exists in the L2TP packet processing code in Juniper ScreenOS firewalls. Remote attackers can send specially crafted L2TP packets to trigger a denial of service condition, likely causing the device to crash or become unresponsive.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data<= 6.3.0= 6.3.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Authentication
- None
- Confidentiality
- None
- Integrity
- None
- Availability
- Partial
AV:N/AC:L/Au:N/C:N/I:N/A:P
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
-
Confirm device is running Juniper ScreenOSAccess the device console or CLI and run 'get system' or 'show system information' to identify the operating systemAffected if The device is not running Juniper ScreenOS - this CVE only applies to ScreenOS devices
-
Check the ScreenOS versionRun the command 'get version' or 'show version' in the ScreenOS CLI to retrieve the exact OS version numberAffected if The installed version is 6.3.0 or any version lower than 6.3.0 (for example, 6.2.x, 6.1.x, etc.)
-
Verify if L2TP is enabled on the deviceRun 'get l2tp' or 'show l2tp' configuration to check whether L2TP tunnel processing is configured and activeAffected if L2TP is enabled and processing L2TP packets - the vulnerability is triggered specifically by crafted L2TP traffic
-
Check L2TP configuration detailsRun 'get config l2tp' or review the ScreenOS configuration for any L2TP-related settings such as L2TP tunnels, L2TP profiles, or L2TP access concentrator settingsAffected if L2TP tunnels or profiles are configured, meaning the device will process incoming L2TP packets
A user is affected if the device runs Juniper ScreenOS version 6.3.0 or below AND has L2TP functionality enabled or configured to process L2TP traffic.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUpgrade Juniper ScreenOS to version 6.3.0r13-dnd1, 6.3.0r18-dnc1, or versions after 6.3.0r19 as specified in the Juniper advisory. If upgrading is not immediately possible, consider restricting L2TP traffic at upstream network boundaries or disabling L2TP if not required.
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,408.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2015-7750 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2015-7750 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data