Juniper ScreenOS Improper Authentication Vulnerability
n/a — n/a
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.
9.8
61.4%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- Dec 19, 2015
- Modified
- Oct 21, 2025
- Added to KEV
- Oct 2, 2025
- Federal patch due
- Oct 23, 2025
CISA 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.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2015-7755, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2015-7755 were found at last check. Absence here is not proof no exploit exists - see the references below for vendor advisories and write-ups.
References
Frequently asked questions
What is CVE-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 6.3.0r21 allows remote attackers to obtain administrative access by entering an unspecified password during a (1) SSH or (2) TELNET session.
How severe is CVE-2015-7755?
CVE-2015-7755 has a CVSS base score of 9.8 out of 10 (CVSS 3.1).
Is CVE-2015-7755 actively exploited in the wild?
Yes. CVE-2015-7755 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Oct 2, 2025, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2015-7755?
61.4% - meaning FIRST.org's EPSS model estimates a 61.4% probability this vulnerability will be exploited in the wild within 30 days (99% percentile among all scored CVEs).
What type of vulnerability is CVE-2015-7755?
CVE-2015-7755 is classified under CWE-287 (CWE-287 Improper Authentication).
Cross-checked against
Impactr finds and proves whether CVE-2015-7755 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.
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