CVE-2016-6394

Session fixation vulnerability in Cisco Firepower Management Center and Cisco FireSIGHT System Software through 6.1.0 allows remote attackers to hijack web sessions via a session identifier, aka Bug ID CSCuz80503.

Published: 2016-09-12 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-6394 is rated Moderate Risk (62/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.45%). EPSS rose +1.15% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2016-6394

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.30% 1.45% +1.15%
2 2025-03-30 0.58% 0.30% -0.28%
3 2025-03-29 — 0.58% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-6394

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.1 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 5.2 [email protected]
5.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 4.9 [email protected]

Weakness enumeration for CVE-2016-6394

Affected software / configurations for CVE-2016-6394

Vendor Product Version Raw CPE
cisco firesight_system_software 5.2.0 cpe:2.3:a:cisco:firesight_system_software:5.2.0:*:*:*:*:*:*:*
cisco firesight_system_software 5.2.0.1 cpe:2.3:a:cisco:firesight_system_software:5.2.0.1:*:*:*:*:*:*:*
cisco firesight_system_software 5.2.0.2 cpe:2.3:a:cisco:firesight_system_software:5.2.0.2:*:*:*:*:*:*:*
cisco firesight_system_software 5.2.0.3 cpe:2.3:a:cisco:firesight_system_software:5.2.0.3:*:*:*:*:*:*:*
cisco firesight_system_software 5.2.0.4 cpe:2.3:a:cisco:firesight_system_software:5.2.0.4:*:*:*:*:*:*:*
cisco firesight_system_software 5.2.0.5 cpe:2.3:a:cisco:firesight_system_software:5.2.0.5:*:*:*:*:*:*:*
cisco firesight_system_software 5.2.0.6 cpe:2.3:a:cisco:firesight_system_software:5.2.0.6:*:*:*:*:*:*:*
cisco firesight_system_software 5.2.0.8 cpe:2.3:a:cisco:firesight_system_software:5.2.0.8:*:*:*:*:*:*:*
cisco firesight_system_software 5.3.0 cpe:2.3:a:cisco:firesight_system_software:5.3.0:*:*:*:*:*:*:*
cisco firesight_system_software 5.3.0.1 cpe:2.3:a:cisco:firesight_system_software:5.3.0.1:*:*:*:*:*:*:*
cisco firesight_system_software 5.3.0.2 cpe:2.3:a:cisco:firesight_system_software:5.3.0.2:*:*:*:*:*:*:*
cisco firesight_system_software 5.3.0.3 cpe:2.3:a:cisco:firesight_system_software:5.3.0.3:*:*:*:*:*:*:*
cisco firesight_system_software 5.3.0.4 cpe:2.3:a:cisco:firesight_system_software:5.3.0.4:*:*:*:*:*:*:*
cisco firesight_system_software 5.3.0.5 cpe:2.3:a:cisco:firesight_system_software:5.3.0.5:*:*:*:*:*:*:*
cisco firesight_system_software 5.3.0.6 cpe:2.3:a:cisco:firesight_system_software:5.3.0.6:*:*:*:*:*:*:*
cisco firesight_system_software 5.3.0.7 cpe:2.3:a:cisco:firesight_system_software:5.3.0.7:*:*:*:*:*:*:*
cisco firesight_system_software 5.3.1 cpe:2.3:a:cisco:firesight_system_software:5.3.1:*:*:*:*:*:*:*
cisco firesight_system_software 5.3.1.1 cpe:2.3:a:cisco:firesight_system_software:5.3.1.1:*:*:*:*:*:*:*
cisco firesight_system_software 5.3.1.2 cpe:2.3:a:cisco:firesight_system_software:5.3.1.2:*:*:*:*:*:*:*
cisco firesight_system_software 5.3.1.3 cpe:2.3:a:cisco:firesight_system_software:5.3.1.3:*:*:*:*:*:*:*
cisco firesight_system_software 5.3.1.4 cpe:2.3:a:cisco:firesight_system_software:5.3.1.4:*:*:*:*:*:*:*
cisco firesight_system_software 5.3.1.5 cpe:2.3:a:cisco:firesight_system_software:5.3.1.5:*:*:*:*:*:*:*
cisco firesight_system_software 5.3.1.7 cpe:2.3:a:cisco:firesight_system_software:5.3.1.7:*:*:*:*:*:*:*
cisco firesight_system_software 5.4.0 cpe:2.3:a:cisco:firesight_system_software:5.4.0:*:*:*:*:*:*:*
cisco firesight_system_software 5.4.0.1 cpe:2.3:a:cisco:firesight_system_software:5.4.0.1:*:*:*:*:*:*:*
cisco firesight_system_software 5.4.0.2 cpe:2.3:a:cisco:firesight_system_software:5.4.0.2:*:*:*:*:*:*:*
cisco firesight_system_software 5.4.0.3 cpe:2.3:a:cisco:firesight_system_software:5.4.0.3:*:*:*:*:*:*:*
cisco firesight_system_software 5.4.0.4 cpe:2.3:a:cisco:firesight_system_software:5.4.0.4:*:*:*:*:*:*:*
cisco firesight_system_software 5.4.0.5 cpe:2.3:a:cisco:firesight_system_software:5.4.0.5:*:*:*:*:*:*:*
cisco firesight_system_software 5.4.0.6 cpe:2.3:a:cisco:firesight_system_software:5.4.0.6:*:*:*:*:*:*:*
cisco firesight_system_software 5.4.1 cpe:2.3:a:cisco:firesight_system_software:5.4.1:*:*:*:*:*:*:*
cisco firesight_system_software 5.4.1.2 cpe:2.3:a:cisco:firesight_system_software:5.4.1.2:*:*:*:*:*:*:*
cisco firesight_system_software 5.4.1.3 cpe:2.3:a:cisco:firesight_system_software:5.4.1.3:*:*:*:*:*:*:*
cisco firesight_system_software 5.4.1.4 cpe:2.3:a:cisco:firesight_system_software:5.4.1.4:*:*:*:*:*:*:*
cisco firesight_system_software 6.0.0 cpe:2.3:a:cisco:firesight_system_software:6.0.0:*:*:*:*:*:*:*
cisco firesight_system_software 6.0.0.1 cpe:2.3:a:cisco:firesight_system_software:6.0.0.1:*:*:*:*:*:*:*
cisco firesight_system_software 6.0.1 cpe:2.3:a:cisco:firesight_system_software:6.0.1:*:*:*:*:*:*:*
cisco firesight_system_software 6.1.0 cpe:2.3:a:cisco:firesight_system_software:6.1.0:*:*:*:*:*:*:*

References for CVE-2016-6394

cvelogic Threat Intelligence