CVE-2015-7755

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Summary

CVECVE-2015-7755
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2015-12-19 14:59:01 UTC
Updated2026-04-21 16:27:21 UTC
DescriptionJuniper 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

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

EPSS: 0.851620000 probability, percentile 0.993610000 (date 2026-04-22)

CISA KEV: Listed on 2025-10-02; due 2025-10-23; ransomware use Unknown

Problem Types: CWE-287 | n/a | CWE-287 CWE-287 Improper Authentication

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1ADPDECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
2.0[email protected]Primary10AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS v3.1 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

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:N/AC:L/Au:N/C:C/I:C/A:C

CISA Known Exploited Vulnerability

VendorJuniper
ProductScreenOS
NameJuniper ScreenOS Improper Authentication Vulnerability
Required ActionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Noteshttps://supportportal.juniper.net/s/article/2015-12-Out-of-Cycle-Security-Bulletin-ScreenOS-Multiple-Security-issues-with-ScreenOS-CVE-2015-7755-CVE-2015-7756 ; https://nvd.nist.gov/vuln/detail/CVE-2015-7755

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Juniper Screenos 6.3.0 r17 All All
Operating System Juniper Screenos 6.3.0 r18 All All
Operating System Juniper Screenos 6.3.0 r19 All All
Operating System Juniper Screenos 6.3.0 r20 All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Juniper ScreenOS Unauthorized Code Lets Remote Users Gain Administrative Access and Also Decrypt VPN Data - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 www.securitytracker.com Broken Link
Juniper Networks - 2015-12 Out of Cycle Security Bulletin: ScreenOS: Multiple Security issues with ScreenOS (CVE-2015-7755, CVE-2015-7756) - Knowledge Base af854a3a-2127-422b-91ae-364da2661108 kb.juniper.net Exploit, Vendor Advisory
“Unauthorized code” in Juniper firewalls decrypts encrypted VPN traffic | Ars Technica af854a3a-2127-422b-91ae-364da2661108 arstechnica.com Third Party Advisory
Much ado about Juniper – Adam Caudill af854a3a-2127-422b-91ae-364da2661108 adamcaudill.com Third Party Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog 134c704f-9b21-4f2e-91b3-4a467353bcc0 www.cisa.gov US Government Resource
GitHub - hdm/juniper-cve-2015-7755: Notes, binaries, and related information from analysis of the CVE-2015-7755 & CVE-2015-7756 issues within Juniper ScreenOS af854a3a-2127-422b-91ae-364da2661108 github.com Third Party Advisory
Ronald Prins on Twitter: "Hmmm. It took @foxit 6 hours to find the password for the ssh/telnet backdoor in the vulnerable Juniper firewalss. Patch now" af854a3a-2127-422b-91ae-364da2661108 twitter.com Broken Link
Important Announcement about ScreenOS® - J-Net Community af854a3a-2127-422b-91ae-364da2661108 forums.juniper.net Vendor Advisory
VU#640184 - Juniper ScreenOS contains multiple vulnerabilities af854a3a-2127-422b-91ae-364da2661108 www.kb.cert.org Third Party Advisory
Secret Code Found in Juniper's Firewalls Shows Risk of Government Backdoors | WIRED af854a3a-2127-422b-91ae-364da2661108 www.wired.com Third Party Advisory
Juniper ScreenOS CVE-2015-7755 Unauthorized Access and Information Disclosure Vulnerabilities af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com Broken Link
Juniper Says It Didn't Work With Government To Add 'Unauthorized Code' To Network Gear af854a3a-2127-422b-91ae-364da2661108 www.forbes.com Permissions Required
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
CISA Known Exploited Vulnerabilities catalog CISA www.cisa.gov kev

Additional Advisory Data

SourceTimeEvent
ADP2025-10-02T00:00:00.000ZCVE-2015-7755 added to CISA KEV
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