CVE-2015-7755

CVE-2015-7755 is a critical-severity vulnerability in Juniper Screenos with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2025-10-02). The underlying weakness is classified as CWE-287.

Key facts

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.

Frequently asked questions

What is 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 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.
How severe is CVE-2015-7755?
CVE-2015-7755 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2015-7755 being actively exploited?
Yes. CVE-2015-7755 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-10-02, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2015-7755?
CVE-2015-7755 primarily affects Juniper Screenos. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-7755?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2015-7755 have an EU (EUVD) identifier?
Yes. CVE-2015-7755 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2015-7655. It is also flagged as exploited in the EUVD (since 2025-10-02).
When was CVE-2015-7755 published?
CVE-2015-7755 was published on 2015-12-19 and last updated on 2026-06-17.

References

Affected products (4)

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