CVE-2015-7755
CriticalExploitedPublic exploitJuniper 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…
Published Dec 19, 2015 · Updated Apr 21, 2026
Key Facts
Patch immediately- CVE-2015-7755 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Screenos (Juniper).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 23, 2015. Public exploit code is available.
- EPSS estimates a 61% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
61%
Higher than 99.1% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2015-7755 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Oct 2, 2025 | Oct 23, 2025 | Not reported |
| Industry KEV feed | Dec 23, 2015 | Oct 23, 2025 | Not reported |
| CIRCL KEV | Oct 2, 2025 | Oct 23, 2025 | Not reported |
| ENISA EUVD | Oct 2, 2025 | n/a | Not reported |
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 Products
4 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| ScreenosJuniper | 6.3.0-r17, 6.3.0-r18, 6.3.0-r19, 6.3.0-r20 | n/a |
Timeline
Publicly disclosed
Dec 19, 2015
Added to Industry KEV feed
Dec 23, 2015
Added to CISA KEV
Oct 2, 2025
Added to CIRCL KEV
Oct 2, 2025
Added to ENISA EUVD
Oct 2, 2025
Last updated
Apr 21, 2026
Weakness Type
- CWE-287 Improper Authentication
References
- advisoryhttp://arstechnica.com/security/2015/12/unauthorized-code-in-juniper-firewalls-decrypts-encrypted-vpn-traffic/
- advisoryhttps://adamcaudill.com/2015/12/17/much-ado-about-juniper/
- advisoryhttps://forums.juniper.net/t5/Security-Incident-Response/Important-Announcement-about-ScreenOS/ba-p/285554
- advisoryhttps://github.com/hdm/juniper-cve-2015-7755
- advisoryVU#640184
FAQ
Common Questions.
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 obt…
Affected: Screenos (Juniper) versions 6.3.0-r17, 6.3.0-r18, 6.3.0-r19, 6.3.0-r20. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 23, 2015.
Yes. It was added on Oct 2, 2025 with a federal remediation due date of Oct 23, 2025.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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