CVE-2015-7756
CVE-2015-7756 is a medium-severity vulnerability in Juniper Screenos with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-310.
Key facts
- Severity: Medium (CVSS 2.0 base score 5.0)
- EPSS exploit prediction: 2% (82nd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-310
- Affected product: Juniper Screenos
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is 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.
- How severe is CVE-2015-7756?
- CVE-2015-7756 has a CVSS 2.0 base score of 5.0, rated medium severity.
- Is CVE-2015-7756 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2015-7756?
- CVE-2015-7756 primarily affects Juniper Screenos. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2015-7756?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2015-7756 published?
- CVE-2015-7756 was published on 2015-12-19 and last updated on 2026-06-17.
References
- http://arstechnica.com/security/2015/12/unauthorized-code-in-juniper-firewalls-decrypts-encrypted-vpn-traffic/
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10713
- http://www.forbes.com/sites/thomasbrewster/2015/12/18/juniper-says-it-didnt-work-with-government-to-add-unauthorized-code-to-network-gear/
- http://www.kb.cert.org/vuls/id/640184
- http://www.securitytracker.com/id/1034489
- http://www.wired.com/2015/12/juniper-networks-hidden-backdoors-show-the-risk-of-government-backdoors/
- https://adamcaudill.com/2015/12/17/much-ado-about-juniper/
- https://forums.juniper.net/t5/Security-Incident-Response/Important-Announcement-about-ScreenOS/ba-p/285554
- https://github.com/hdm/juniper-cve-2015-7755
Affected products (12)
- cpe:2.3:o:juniper:screenos:6.2.0r15:*:*:*:*:*:*:*
- cpe:2.3:o:juniper:screenos:6.2.0r16:*:*:*:*:*:*:*
- cpe:2.3:o:juniper:screenos:6.2.0r17:*:*:*:*:*:*:*
- cpe:2.3:o:juniper:screenos:6.2.0r18:*:*:*:*:*:*:*
- cpe:2.3:o:juniper:screenos:6.3.0:r12:*:*:*:*:*:*
- cpe:2.3:o:juniper:screenos:6.3.0:r14:*:*:*:*:*:*
- cpe:2.3:o:juniper:screenos:6.3.0:r15:*:*:*:*:*:*
- cpe:2.3:o:juniper:screenos:6.3.0:r16:*:*:*:*:*:*
- cpe:2.3:o:juniper:screenos:6.3.0:r17:*:*:*:*:*:*
- cpe:2.3:o:juniper:screenos:6.3.0:r18:*:*:*:*:*:*
- cpe:2.3:o:juniper:screenos:6.3.0:r19:*:*:*:*:*:*
- cpe:2.3:o:juniper:screenos:6.3.0:r20:*:*:*:*:*:*
More vulnerabilities in Juniper Screenos
- CVE-2015-7755 — Critical (CVSS 9.8): 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…
- CVE-2017-2336 — Critical (CVSS 9.6): A reflected cross site scripting vulnerability in NetScreen WebUI of Juniper Networks Juniper NetScreen Firewall+VPN…
- CVE-2017-2339 — High (CVSS 8.4): A persistent cross site scripting vulnerability in NetScreen WebUI of Juniper Networks Juniper NetScreen Firewall+VPN…
- CVE-2017-2338 — High (CVSS 8.4): A persistent cross site scripting vulnerability in NetScreen WebUI of Juniper Networks Juniper NetScreen Firewall+VPN…
- CVE-2017-2337 — High (CVSS 8.4): A persistent cross site scripting vulnerability in NetScreen WebUI of Juniper Networks Juniper NetScreen Firewall+VPN…
- CVE-2017-2335 — High (CVSS 8.4): A persistent cross site scripting vulnerability in NetScreen WebUI of Juniper Networks Juniper NetScreen Firewall+VPN…
All CVEs affecting Juniper Screenos →
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