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-2016-6420

18
FAUCET Score

CVE-2016-6420 describes an authorization bypass vulnerability in Cisco FireSIGHT System Software versions 4.10.3 through 5.4.0, affecting Firepower Management Center. This flaw allows remote authenticated users to elevate their privileges by sending a specially crafted HTTP request. With a CVSS score of 6.5 (Medium), it has a low attack complexity and requires low privileges, potentially leading to high confidentiality impact. There is no evidence of active exploitation, and no public exploit code is available in Metasploit, Nuclei, or ExploitDB, with minimal community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
4.10.3CPE matchmatch criteria
cpe:2.3:a:cisco:firesight_system_software:4.10.3:*:*:*:*:*:*:*
5.2.0CPE matchmatch criteria
cpe:2.3:a:cisco:firesight_system_software:5.2.0:*:*:*:*:*:*:*
5.3.0CPE matchmatch criteria
cpe:2.3:a:cisco:firesight_system_software:5.3.0:*:*:*:*:*:*:*
5.3.1CPE matchmatch criteria
cpe:2.3:a:cisco:firesight_system_software:5.3.1:*:*:*:*:*:*:*
5.4.0CPE matchmatch criteria
cpe:2.3:a:cisco:firesight_system_software:5.4.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.84%
Probability of exploitation in next 30 days
EPSS Percentile
76.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0184 is in the 89th percentile among its peer group of 21,958 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

Media Mentions

No media coverage found for this CVE.

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)

ciscovendor investigatingvia nvd_reference
View patch

References

tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20160928-fmc1
Vendor Advisory
securityfocus.com / bid/93204
securitytracker.com / id/1036919