Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2015-7756

17
FAUCET Score

CVE-2015-7756 describes a flaw in the encryption implementation of Juniper ScreenOS versions 6.2.0r15 through 6.2.0r18 and various 6.3.0r versions. This vulnerability allows remote attackers to more easily decrypt VPN session content by sniffing network traffic and performing an unspecified decryption attack. With a CVSS score of 5.0, it presents a moderate risk, requiring no authentication and low attack complexity, primarily impacting confidentiality. While there is no KEV entry or known public exploit code, the vulnerability has garnered significant community discussion and media coverage, indicating high awareness and potential for exploitation despite its inactive Hot List status.

Impacted Technologies

VendorProductVersion(s)CPE
6.2.0r15CPE matchmatch criteria
cpe:2.3:o:juniper:screenos:6.2.0r15:*:*:*:*:*:*:*
6.2.0r16CPE matchmatch criteria
cpe:2.3:o:juniper:screenos:6.2.0r16:*:*:*:*:*:*:*
6.2.0r17CPE matchmatch criteria
cpe:2.3:o:juniper:screenos:6.2.0r17:*:*:*:*:*:*:*
6.2.0r18CPE matchmatch criteria
cpe:2.3:o:juniper:screenos:6.2.0r18:*:*:*:*:*:*:*
6.3.0CPE matchmatch criteria
cpe:2.3:o:juniper:screenos:6.3.0:r12:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.45%
Probability of exploitation in next 30 days
EPSS Percentile
82.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0245 is in the 74th percentile among its peer group of 23,725 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

junipervendor investigatingvia nvd_reference
View patch

References

arstechnica.com / security/2015/12/unauthorized-code-in-juniper-firewalls-decrypts-encrypted-vpn-traffic
kb.juniper.net / InfoCenter/index
Vendor Advisory
adamcaudill.com / 2015/12/17/much-ado-about-juniper
forums.juniper.net / t5/Security-Incident-Response/Important-Announcement-about-ScreenOS/ba-p/285554
github.com / hdm/juniper-cve-2015-7755
forbes.com / sites/thomasbrewster/2015/12/18/juniper-says-it-didnt-work-with-government-to-add-unauthorized-code-to-network-gear
kb.cert.org / vuls/id/640184
securitytracker.com / id/1034489
wired.com / 2015/12/juniper-networks-hidden-backdoors-show-the-risk-of-government-backdoors