CVEvulnerability
CVE-2015-7755
CISA Known Exploited Vulnerability
Juniper ScreenOS Improper Authentication Vulnerability — Juniper ScreenOS
Juniper ScreenOS contains an improper authentication vulnerability that could allow unauthorized remote administrative access to the device.
- Added to KEV
- 2025-10-02
- Remediation due
- 2025-10-23
- Ransomware use
- Unknown
- 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.
- 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
- Status
- Analyzed
- Published
- 2015-12-19
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CVSS 2.0 ([email protected])
- 10.0 HIGH — AV:N/AC:L/Au:N/C:C/I:C/A:C
- Weaknesses
- CWE-287
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.
Affected configurations
• juniper screenos 6.3.0
Related
Weakness · CWE (1)
- CWE-287 Improper Authentication weakness
References
- http://arstechnica.com/security/2015/12/unauthorized-code-in-juniper-firewalls-decrypts-encrypted-vpn-traffic/ Third Party Advisory
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10713 Exploit, Vendor Advisory
- http://twitter.com/cryptoron/statuses/677900647560253442 Broken Link
- http://www.forbes.com/sites/thomasbrewster/2015/12/18/juniper-says-it-didnt-work-with-government-to-add-unauthorized-code-to-network-gear/ Permissions Required
- http://www.kb.cert.org/vuls/id/640184 Third Party Advisory
- http://www.securityfocus.com/bid/79626 Broken Link
- http://www.securitytracker.com/id/1034489 Broken Link
- http://www.wired.com/2015/12/juniper-networks-hidden-backdoors-show-the-risk-of-government-backdoors/ Third Party Advisory
- https://adamcaudill.com/2015/12/17/much-ado-about-juniper/ Third Party Advisory
- https://forums.juniper.net/t5/Security-Incident-Response/Important-Announcement-about-ScreenOS/ba-p/285554 Vendor Advisory
- https://github.com/hdm/juniper-cve-2015-7755 Third Party Advisory
- http://arstechnica.com/security/2015/12/unauthorized-code-in-juniper-firewalls-decrypts-encrypted-vpn-traffic/ Third Party Advisory
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10713 Exploit, Vendor Advisory
- http://twitter.com/cryptoron/statuses/677900647560253442 Broken Link
- http://www.forbes.com/sites/thomasbrewster/2015/12/18/juniper-says-it-didnt-work-with-government-to-add-unauthorized-code-to-network-gear/ Permissions Required
- http://www.kb.cert.org/vuls/id/640184 Third Party Advisory
- http://www.securityfocus.com/bid/79626 Broken Link
- http://www.securitytracker.com/id/1034489 Broken Link
- http://www.wired.com/2015/12/juniper-networks-hidden-backdoors-show-the-risk-of-government-backdoors/ Third Party Advisory
- https://adamcaudill.com/2015/12/17/much-ado-about-juniper/ Third Party Advisory
- https://forums.juniper.net/t5/Security-Incident-Response/Important-Announcement-about-ScreenOS/ba-p/285554 Vendor Advisory
- https://github.com/hdm/juniper-cve-2015-7755 Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2015-7755 US Government Resource