Vulnerability Monitor

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CVE-2015-7756

The encryption implementation in 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 makes it easier for remote attackers to discover the plaintext content of VPN sessions by sniffing the network for ciphertext data and conducting an unspecified decryption attack.

Security Impact Summary

CVE-2015-7756 is a security vulnerability that . Impacting 1 product from juniper organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2015, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2015-12-19T14:59:02.767

Last Modified

2025-04-12T10:46:40.837

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 5.0 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:N/A:N

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: NONE
Availability Impact: NONE

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
CWE-310

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	juniper	screenos	6.2.0r15	Yes
Operating System	juniper	screenos	6.2.0r16	Yes
Operating System	juniper	screenos	6.2.0r17	Yes
Operating System	juniper	screenos	6.2.0r18	Yes
Operating System	juniper	screenos	6.3.0	Yes
Operating System	juniper	screenos	6.3.0	Yes
Operating System	juniper	screenos	6.3.0	Yes
Operating System	juniper	screenos	6.3.0	Yes
Operating System	juniper	screenos	6.3.0	Yes
Operating System	juniper	screenos	6.3.0	Yes
Operating System	juniper	screenos	6.3.0	Yes
Operating System	juniper	screenos	6.3.0	Yes

References

http://arstechnica.com/security/2015/12/unauthorized-code-in-juniper-firewalls-decrypts-encrypted-vpn-traffic/ ([email protected])
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10713 Vendor Advisory ([email protected])
http://www.forbes.com/sites/thomasbrewster/2015/12/18/juniper-says-it-didnt-work-with-government-to-add-unauthorized-code-to-network-gear/ ([email protected])
http://www.kb.cert.org/vuls/id/640184 ([email protected])
http://www.securitytracker.com/id/1034489 ([email protected])
http://www.wired.com/2015/12/juniper-networks-hidden-backdoors-show-the-risk-of-government-backdoors/ ([email protected])
https://adamcaudill.com/2015/12/17/much-ado-about-juniper/ ([email protected])
https://forums.juniper.net/t5/Security-Incident-Response/Important-Announcement-about-ScreenOS/ba-p/285554 ([email protected])
https://github.com/hdm/juniper-cve-2015-7755 ([email protected])
http://arstechnica.com/security/2015/12/unauthorized-code-in-juniper-firewalls-decrypts-encrypted-vpn-traffic/ (af854a3a-2127-422b-91ae-364da2661108)
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10713 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.forbes.com/sites/thomasbrewster/2015/12/18/juniper-says-it-didnt-work-with-government-to-add-unauthorized-code-to-network-gear/ (af854a3a-2127-422b-91ae-364da2661108)
http://www.kb.cert.org/vuls/id/640184 (af854a3a-2127-422b-91ae-364da2661108)
http://www.securitytracker.com/id/1034489 (af854a3a-2127-422b-91ae-364da2661108)
http://www.wired.com/2015/12/juniper-networks-hidden-backdoors-show-the-risk-of-government-backdoors/ (af854a3a-2127-422b-91ae-364da2661108)
https://adamcaudill.com/2015/12/17/much-ado-about-juniper/ (af854a3a-2127-422b-91ae-364da2661108)
https://forums.juniper.net/t5/Security-Incident-Response/Important-Announcement-about-ScreenOS/ba-p/285554 (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/hdm/juniper-cve-2015-7755 (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For juniper's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.