CVE-2015-7755
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…
- 9.8CriticalCVSS base score
- 61.4%Exploitation in 30 daysEPSS · top 0.8% of all CVEs
- YesKnown exploitedin CISA's KEV since 2 Oct 2025
- 1Public exploitsMetasploit, Nuclei and Exploit-DB
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.
Exploited in the wild
CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as Juniper ScreenOS Improper Authentication Vulnerability.
- Added
- 2 Oct 2025
- Fix due (US federal)
- 23 Oct 2025
- Used by ransomware
- Not known
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
ENISA's EU Vulnerability Database lists it as exploited, from CISA's KEV, since 2 Oct 2025.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. The public collections list a Metasploit module for it. CISA's SSVC rates its exploitation: it is being exploited.
Show the exploits1
Metasploit modules1 module
- Juniper SSH Backdoor Scanner (Metasploit module) (opens in a new tab)
auxiliary/scanner/ssh/juniper_backdoorRank normaldisclosed 20 Dec 2015
Modules, templates and exploits as listed by the Metasploit Framework (BSD-3-Clause), ProjectDiscovery's Nuclei templates (MIT) and the Exploit Database (GPLv2), read once a day. Where the data comes from
Timeline
ID reserved
By mitre
- 2 months later
· 2 months later
Published
- 10 years later
· 10 years later
Added to CISA KEV
Known exploited in the wild
- 19 days later
· 19 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 61.4% · top 0.8% of all CVEs (10 Nov 2026)
- CISA SSVC
- Exploitation: active · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
n/a
- affected n/a
References
12
- http://arstechnica.com/security/2015/12/unauthorized-code-in-juniper-firewalls-decrypts-encrypted-vpn-traffic/ (opens in a new tab)x_refsource_MISCx_transferred
- http://www.wired.com/2015/12/juniper-networks-hidden-backdoors-show-the-risk-of-government-backdoors/ (opens in a new tab)x_refsource_MISCx_transferred
- 1034489 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- VU#640184 (opens in a new tab)third-party-advisoryx_refsource_CERT-VNx_transferred
- https://forums.juniper.net/t5/Security-Incident-Response/Important-Announcement-about-ScreenOS/ba-p/285554 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/hdm/juniper-cve-2015-7755 (opens in a new tab)x_refsource_MISCx_transferred
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10713 (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://twitter.com/cryptoron/statuses/677900647560253442 (opens in a new tab)x_refsource_MISCx_transferred
- https://adamcaudill.com/2015/12/17/much-ado-about-juniper/ (opens in a new tab)x_refsource_MISCx_transferred
- http://www.forbes.com/sites/thomasbrewster/2015/12/18/juniper-says-it-didnt-work-with-government-to-add-unauthorized-code-to-network-gear/ (opens in a new tab)x_refsource_MISCx_transferred
- 79626 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2015-7755 (opens in a new tab)government-resource
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- CISA KEV catalog (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2015-7655 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2015-7755)Record last updated .