Vulnerability · CVE-2015-7755
Juniper ScreenOS Improper Authentication Vulnerability
Published Dec 19, 2015 · catalog updated Jun 16, 2026 · Juniper ScreenOS
Patch now
CVE-2015-7755 is in the CISA known-exploited catalog, due Oct 23, 2025. Confirm Juniper ScreenOS against the vendor advisory and apply that fix. The CVSS score does not change the priority.
- Severity
- Critical9.8
- Known exploitation
- CISA KEV and VulnCheck KEV
- EPSS
- 61.14%
- Remediation
- Remediation guidance
- Affected products
- cpe juniper/screenos · vendor Juniper ScreenOS
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.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe juniper/screenos6.3.0
- vendor Juniper ScreenOSversion unspecified
How to fix CVE-2015-7755
Recommended remediation
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. CISA due date Oct 23, 2025.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
CVE-2015-7755 is in the CISA known-exploited catalog, due Oct 23, 2025. Confirm Juniper ScreenOS against the vendor advisory and apply that fix. The CVSS score does not change the priority.
Which versions are affected?
Compare what you have installed with 6.3.0. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
What should an analyst verify?
CWE-287: Improper Authentication. EPSS 61.14%. The CISA KEV listing is the exploitation evidence. A public exploit reference is linked in Sources. That is not the same as confirmed exploitation. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Dec 19, 2015 · Catalog
Detected
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
Oct 2, 2025 · CISA KEV
Known exploited
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Oct 23, 2025 · CISA KEV
Remediation due
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Jun 16, 2026 · Catalog
Updated
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
Sources
- CISA KEVConfirmed exploitationCVE-2015-7755
Juniper ScreenOS contains an improper authentication vulnerability that could allow unauthorized remote administrative access to the device.
cisa.gov - CVE.orgVulnerability recordCVE-2015-7755
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2015-7755
30-day exploitation probability 61.1%
first.org - Metasploit ModulesPublic exploit moduleauxiliary_scanner/ssh/juniper_backdoor
Public module reference (normal). Module source is not copied into this catalog.
rapid7.com - NIST NVDVulnerability recordCVE-2015-7755
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
nvd.nist.gov - VulnCheck KEVConfirmed exploitationCVE-2015-7755
Juniper ScreenOS contains an improper authentication vulnerability that could allow unauthorized remote administrative access to the device.
vulncheck.com
References
- Third Party Advisory · arstechnica.com
- Exploit · kb.juniper.net
- Broken Link · twitter.com
- Permissions Required · forbes.com
- Third Party Advisory · kb.cert.org
- VulnCheck exploitation evidence · cyble.com
- Vendor Advisory · forums.juniper.net
- CISA note · nvd.nist.gov
- VulnCheck exploitation evidence · securityaffairs.com
- CISA note · supportportal.juniper.net
- VulnCheck exploitation evidence · cisa.gov
- VulnCheck exploitation evidence · loginsoft.com
- VulnCheck exploitation evidence · tripwire.com
Freshness
Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.