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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.","epss":{"date":"2026-11-12","epss":0.614,"percentile":0.99177},"epss_checked":1794522003,"first_seen":1793665375,"kev":{"cveID":"CVE-2015-7755","cwes":["CWE-287"],"dateAdded":"2025-10-02","dueDate":"2025-10-23","forensicTriage":"No","knownRansomwareCampaignUse":"Unknown","notes":"https://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","product":"ScreenOS","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","shortDescription":"Juniper ScreenOS contains an improper authentication vulnerability that could allow unauthorized remote administrative access to the device.","vendorProject":"Juniper","vulnerabilityName":"Juniper ScreenOS Improper Authentication Vulnerability"},"kev_checked":1794522003,"products":"n/a n/a","references":["http://arstechnica.com/security/2015/12/unauthorized-code-in-juniper-firewalls-decrypts-encrypted-vpn-traffic/","http://www.wired.com/2015/12/juniper-networks-hidden-backdoors-show-the-risk-of-government-backdoors/","http://www.securitytracker.com/id/1034489","http://www.kb.cert.org/vuls/id/640184","https://forums.juniper.net/t5/Security-Incident-Response/Important-Announcement-about-ScreenOS/ba-p/285554","https://github.com/hdm/juniper-cve-2015-7755","http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10713","http://twitter.com/cryptoron/statuses/677900647560253442","https://adamcaudill.com/2015/12/17/much-ado-about-juniper/","http://www.forbes.com/sites/thomasbrewster/2015/12/18/juniper-says-it-didnt-work-with-government-to-add-unauthorized-code-to-network-gear/","http://www.securityfocus.com/bid/79626","https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2015-7755"],"score":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","provider":"CISA-ADP","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"solutions":"","state":"PUBLISHED","title":"Juniper ScreenOS Improper Authentication Vulnerability","updated_at":1794500401,"workarounds":""},"sources":[]}