# CVE-2015-7755: Juniper ScreenOS Improper Authentication Vulnerability

> CVE-2015-7755: Juniper ScreenOS Improper Authentication Vulnerability. CVSS 9.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2015-7755
Last updated: 2025-10-21T23:55:56Z

- Published: 2015-12-19 11:00 UTC · Updated: 2025-10-21 23:55 UTC · Assigner: mitre
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 61.1%, 99th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2025-10-02, federal due date 2025-10-23, ransomware use: Unknown

## 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.

## 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.

## Affected vendors and products

- Juniper: ScreenOS

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2015-7755)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2015-7755)
- [http://arstechnica.com/security/2015/12/unauthorized-code-in-juniper-firewalls-decrypts-encrypted-vpn-traffic/](http://arstechnica.com/security/2015/12/unauthorized-code-in-juniper-firewalls-decrypts-encrypted-vpn-traffic/)
- [http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10713](http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10713)
- [https://adamcaudill.com/2015/12/17/much-ado-about-juniper/](https://adamcaudill.com/2015/12/17/much-ado-about-juniper/)
- [https://forums.juniper.net/t5/Security-Incident-Response/Important-Announcement-about-ScreenOS/ba-p/285554](https://forums.juniper.net/t5/Security-Incident-Response/Important-Announcement-about-ScreenOS/ba-p/285554)
- [https://github.com/hdm/juniper-cve-2015-7755](https://github.com/hdm/juniper-cve-2015-7755)
- [http://twitter.com/cryptoron/statuses/677900647560253442](http://twitter.com/cryptoron/statuses/677900647560253442)
- [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.forbes.com/sites/thomasbrewster/2015/12/18/juniper-says-it-didnt-work-with-government-to-add-unauthorized-code-to-network-gear/)
- [http://www.kb.cert.org/vuls/id/640184](http://www.kb.cert.org/vuls/id/640184)
- [http://www.securityfocus.com/bid/79626](http://www.securityfocus.com/bid/79626)
- [http://www.securitytracker.com/id/1034489](http://www.securitytracker.com/id/1034489)
- [http://www.wired.com/2015/12/juniper-networks-hidden-backdoors-show-the-risk-of-government-backdoors/](http://www.wired.com/2015/12/juniper-networks-hidden-backdoors-show-the-risk-of-government-backdoors/)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2015-7755 · Markdown: https://rewindex.com/cve/CVE-2015-7755.md · JSON: https://rewindex.com/api/v1/cves/CVE-2015-7755 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:45:09.148Z