ExploitedIn CISA KEV

CVE-2015-7755

Exploitation confirmed. First attested on 2025-10-02 by CISA-ADP, CISA KEV, GCVE · kevintel.

Published2015-12-19
WeaknessCWE-287

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2015-12-1914:59CVE publishedNVD
2025-10-02Listed as exploited by GCVEGCVE
2025-10-02Exploitation first reportedCISA KEV
2025-10-02Added to the CISA KEV catalogCISA KEV
2025-10-0203:55SSVC exploitation set to activeCISA-ADP
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2015-7755?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2015-7755?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Juniper screenos

Branch	Affected	Fixed in	Source
6.3	= 6.3.0	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

CISA’s 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.due 2025-10-23

Advisories and patches

kb.juniper.netVendor Advisory
forums.juniper.netVendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 2 repositories, unverifiedhdm/juniper-cve-2015-7755cinno/CVE-2015-7755-POC

CISA Known Exploited Vulnerability

Date Added: 2025-10-02
Patch Due Date: 2025-10-23
Ransomware Use: Unknown
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.

Sources

CISA KEVKEV entry2025-10-02
GCVEexploitation2025-10-02
CISA-ADPSSVC decisionactive2025-10-02
OpenCVESSVC decisionactive—
CISA-ADPCVSS 3.19.82025-10-01
NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.010read 2026-10-23
CISA-ADPweakness (CWE)CWE-2872025-10-01
NVDweakness (CWE)CWE-287read 2026-10-23
FIRST EPSSEPSS score61.1 %read 2026-10-23
PoC-in-GitHubproof of concept2read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2015-12-19
Last Modified: 2026-06-17
NVD status: Analyzed

Frequently asked questions

What is CVE-2015-7755?

Is CVE-2015-7755 actively exploited?

Yes. CVE-2015-7755 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2025-10-23.

What is the CVSS score for CVE-2015-7755?

CVE-2015-7755 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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