CVE-2015-7755

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2025-10-02. Federal remediation due 2025-10-23.

SSVC decision

• ExploitationactiveCISA reports credible evidence of active exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

61.40% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 99.1% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2015-12-19 11:00Z10 YR AGO

Last updated

2025-10-21 23:55Z10 MO AGO

Reserved

2015-10-08

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

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

Weaknesses

• CWE-287Improper AuthenticationClass

Data version

5.1

Document digest

1ead2f6dfc49cef8ff323e1cffe6f3657e40ca81b73dd48da0aab25c0cd74157

• arstechnica.comhttp://arstechnica.com/security/2015/12/unauthorized-code-in-juniper-firewalls-decrypts-encrypted-vpn-traffic/
• www.wired.comhttp://www.wired.com/2015/12/juniper-networks-hidden-backdoors-show-the-risk-of-government-backdoors/
• www.securitytracker.com1034489http://www.securitytracker.com/id/1034489vdb-entry
• www.kb.cert.orgVU#640184http://www.kb.cert.org/vuls/id/640184third-party-advisory
• forums.juniper.nethttps://forums.juniper.net/t5/Security-Incident-Response/Important-Announcement-about-ScreenOS/ba-p/285554
• github.comhttps://github.com/hdm/juniper-cve-2015-7755
• kb.juniper.nethttp://kb.juniper.net/InfoCenter/index?page=content&id=JSA10713
• twitter.comhttp://twitter.com/cryptoron/statuses/677900647560253442
• adamcaudill.comhttps://adamcaudill.com/2015/12/17/much-ado-about-juniper/
• www.forbes.comhttp://www.forbes.com/sites/thomasbrewster/2015/12/18/juniper-says-it-didnt-work-with-government-to-add-unauthorized-code-to-network-gear/
• www.securityfocus.com79626http://www.securityfocus.com/bid/79626vdb-entry
• www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2015-7755government-resource