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CVE-2015-7755

9.8, critical Known exploited

Juniper ScreenOS Improper Authentication Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
9.8, critical critical CVSS v3.1
EPSS, next 30 days
61% higher than 99.1% of scored CVEs
Exploitation
Confirmed in the wild
Published
19 Dec 201510 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 2 Oct 2025. US federal agencies had to remediate by 23 Oct 2025, a deadline that has passed.

Required action. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Description

Juniper ScreenOS 6.2.0r15 through 6.2.0r18, 6.3.0r12 before 6.3.0r12b, 6.3.0r13 before 6.3.0r13b, 6.3.0r14 before 6.3.0r14b, 6.3.0r15 before 6.3.0r15b, 6.3.0r16 before 6.3.0r16b, 6.3.0r17 before 6.3.0r17b, 6.3.0r18 before 6.3.0r18b, 6.3.0r19 before 6.3.0r19b, and 6.3.0r20 before 6.3.0r21 allows remote attackers to obtain administrative access by entering an unspecified password during a (1) SSH or (2) TELNET session.

Details

Vendor
Juniper
Product
Screenos
Weakness
CWE-287 (opens in a new tab)
Status
Analyzed
Updated
17 Jun 2026
Assigner
cve@mitre.org

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References 12

Exploit code 1

Advisories 8

Other references 3

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Juniper CVEs

Every Juniper CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2025-21590 Juniper Junos OS Improper Isolation or Compartmentalization Vulnerability KEV EPSS 2% 4.4, medium
  • CVE-2023-36851 Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability KEV EPSS 1% 5.3, medium
  • CVE-2023-36844 Juniper Junos OS EX Series PHP External Variable Modification Vulnerability KEV EPSS 90% 5.3, medium
  • CVE-2023-36845 Juniper Junos OS EX Series and SRX Series PHP External Variable Modification Vulnerability KEV EPSS 95% 9.8, critical
  • CVE-2023-36846 Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability KEV EPSS 93% 5.3, medium
  • CVE-2023-36847 Juniper Junos OS EX Series Missing Authentication for Critical Function Vulnerability KEV EPSS 83% 5.3, medium
  • CVE-2020-1631 Juniper Junos OS Path Traversal Vulnerability KEV EPSS 5% 9.8, critical

Beyond this page

Is CVE-2015-7755 in your network?

This page tells you how dangerous CVE-2015-7755 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2015-7755 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 16 Oct 2026, not the live upstream state.