What is the CVSS score of CVE-2015-6435?

CVE-2015-6435 has a CVSS 3.0 base score of 9.8 (Critical). CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 16.0%.

Is there a public PoC exploit available for CVE-2015-6435?

Yes, a public proof-of-concept exploit is available for CVE-2015-6435. Prioritise patching immediately. EPSS: 16.0%.

Unified Computing System CVE-2015-6435

CRITICAL

OS Command Injection (CWE-78)

2016-01-22 psirt@cisco.com

Command Injection Cisco Unified Computing System Firepower Extensible Operating System

9.8

CVSS 3.0 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-78 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V1 - Encoding and Sanitization OS command sanitization, avoid shell exec MITRE ATT&CK 2 techniques across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available. EPSS exploitation probability: 16.00%.
Exploit ScenarioDerived	A remote attacker could execute arbitrary operating system commands on the host by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

Emergency Immediate action required. Why: CRITICAL + active threat signals, no patch available.

No patch listed yet 16.0% exploitation probability (EPSS)

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AnalysisAI

An unspecified CGI script in Cisco FX-OS before 1.1.2 on Firepower 9000 devices and Cisco Unified Computing System (UCS) Manager before 2.2(4b), 2.2(5) before 2.2(5a), and 3.0 before 3.0(2e) allows. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and EPSS exploitation probability 16.0%.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Avoid passing user input to shell commands. Use language-specific APIs instead of shell execution. Apply strict input validation with allowlists.

Affects your stack

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Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as OS Command Injection (CWE-78), which allows attackers to execute arbitrary operating system commands on the host. An unspecified CGI script in Cisco FX-OS before 1.1.2 on Firepower 9000 devices and Cisco Unified Computing System (UCS) Manager before 2.2(4b), 2.2(5) before 2.2(5a), and 3.0 before 3.0(2e) allows remote attackers to execute arbitrary shell commands via a crafted HTTP request, aka Bug ID CSCur90888. Affected products include: Cisco Firepower Extensible Operating System, Cisco Unified Computing System. Version information: before 1.1.2.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

DescriptionCVE.org

An unspecified CGI script in Cisco FX-OS before 1.1.2 on Firepower 9000 devices and Cisco Unified Computing System (UCS) Manager before 2.2(4b), 2.2(5) before 2.2(5a), and 3.0 before 3.0(2e) allows remote attackers to execute arbitrary shell commands via a crafted HTTP request, aka Bug ID CSCur90888.

Threat Intelligence Overview

EPSS Score

16.0%

Top 5% exploitable

Exploit

POC

Public exploit code exists

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC Yes

EPSS 16.0%

Patch available No

Active threat Yes

Deciding rule

CRITICAL + active threat signals, no patch available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +16

CVSS: +49

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

OS Command Injection CRITICAL

OS command injection occurs when an application passes unsanitized user input directly into system shell commands.

Affected Products (CPE)CVE.org

cpe:2.3:o:cisco:firepower_extensible_operating_system:1.1\(1.86\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:firepower_extensible_operating_system:1.1\(1.160\):*:*:*:*:*:*:*

cpe:2.3:o:cisco:firepower_extensible_operating_system:1.1.1:*:*:*:*:*:*:*

cpe:2.3:a:cisco:unified_computing_system:1.0\(2k\):*:*:*:*:*:*:*

cpe:2.3:a:cisco:unified_computing_system:1.0_base:*:*:*:*:*:*:*

cpe:2.3:a:cisco:unified_computing_system:1.1\(1m\):*:*:*:*:*:*:*

cpe:2.3:a:cisco:unified_computing_system:1.1_base:*:*:*:*:*:*:*

cpe:2.3:a:cisco:unified_computing_system:1.2\(1d\):*:*:*:*:*:*:*

cpe:2.3:a:cisco:unified_computing_system:1.2_base:*:*:*:*:*:*:*

cpe:2.3:a:cisco:unified_computing_system:1.3\(1c\):*:*:*:*:*:*:*

cpe:2.3:a:cisco:unified_computing_system:1.3\(1m\):*:*:*:*:*:*:*

cpe:2.3:a:cisco:unified_computing_system:1.3\(1n\):*:*:*:*:*:*:*

cpe:2.3:a:cisco:unified_computing_system:1.3\(1o\):*:*:*:*:*:*:*

cpe:2.3:a:cisco:unified_computing_system:1.3\(1p\):*:*:*:*:*:*:*

cpe:2.3:a:cisco:unified_computing_system:1.3\(1q\):*:*:*:*:*:*:*

cpe:2.3:a:cisco:unified_computing_system:1.3\(1t\):*:*:*:*:*:*:*

cpe:2.3:a:cisco:unified_computing_system:1.3\(1w\):*:*:*:*:*:*:*

cpe:2.3:a:cisco:unified_computing_system:1.3\(1y\):*:*:*:*:*:*:*

cpe:2.3:a:cisco:unified_computing_system:1.3_base:*:*:*:*:*:*:*

cpe:2.3:a:cisco:unified_computing_system:1.4\(1i\):*:*:*:*:*:*:*

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References

Advisories & patches

ADVISORY http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160120-ucsm REF http://www.securitytracker.com/id/1034743

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