CVE-2015-7755

Name: CVE-2015-7755
Creator: NVD / NIST
Published: 2015-12-19T14:59:01.453+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10Actively ExploitedEPSS 61.40%

Last modified Jun 17, 2026

CVE-2015-7755 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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 has confirmed active exploitation in the wild. EPSS estimates a 61.40% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

61.40%

99.0th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Oct 23, 2025.

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Juniper	Screenos	6.3.0	R17

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=JSA10713Exploit, Vendor Advisory
http://twitter.com/cryptoron/statuses/677900647560253442Broken 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/640184Third Party Advisory
http://www.securityfocus.com/bid/79626Broken Link
http://www.securitytracker.com/id/1034489Broken 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/285554Vendor Advisory
https://github.com/hdm/juniper-cve-2015-7755Third 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=JSA10713Exploit, Vendor Advisory
http://twitter.com/cryptoron/statuses/677900647560253442Broken 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/640184Third Party Advisory
http://www.securityfocus.com/bid/79626Broken Link
http://www.securitytracker.com/id/1034489Broken 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/285554Vendor Advisory
https://github.com/hdm/juniper-cve-2015-7755Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2015-7755US Government Resource

Timeline

Published: Dec 19, 2015
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2015-7755?

How severe is CVE-2015-7755?

CVE-2015-7755 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 61.40% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2015-7755?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST