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CVE-2015-7755: Juniper ScreenOS Improper Authentication Vulnerability

CVSS: 10.0v2.0HighKEVAnalyzed
Published 19-12-2015Last modified 21-10-2025
Open JSON

Vulnerability summary

CVE-2015-7755 is a high (CVSS 10.0) Improper Authentication vulnerability in Juniper ScreenOS. It is known to be exploited: CISA lists it, first on 02-10-2025. EPSS estimates a 61.14% chance of exploitation in the next 30 days, higher than 99.1% of scored vulnerabilities. 2 public exploits are recorded.

Overall risk
90/100
0100
Critical · default modelHow is this calculated?
CVSS score
10.0/10
010
High · v2.0 (NVD)
EPSS score
61.14%
0%100%
Critical · 0.00 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits2reference, metasploit

Timeline

  1. 19-12-2015
    PublishedVulnerability first disclosed.
  2. 02-10-2025
    Added to CISA KEVJuniper ScreenOS Improper Authentication Vulnerability
  3. 21-10-2025
    Last modifiedVulnerability information updated.
  4. 23-10-2025
    CISA remediation dueApply mitigations per vendor instructions.

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

61.14%

Chance of exploitation in the next 30 days

Percentile

99%

Versus all other CVEs

30-day change

0.00 pp

From 61.14% on 18-09-2026

18-09-202618-10-2026
EPSS score
61.14%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
02-10-2025
Federal due date
23-10-2025

CISA 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. supportportal.juniper.net/s/… nvd.nist.gov/vuln/detail/CVE-2015-7755

Public exploits

2 found
  • referenceUnverified

    Exploit Reference (kb.juniper.net)

    Maturity: unknown

  • MetasploitMetasploitremoteUnverified

    Juniper SSH Backdoor Scanner

    auxiliary/scanner/ssh/juniper_backdoor

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Juniper1 product
  • screenos6.3.0:r17 | 6.3.0:r18 | 6.3.0:r19 | 6.3.0:r20

1 vendor · 1 product

References

12 links
Show all 12 references