How severe is CVE-2015-6435?

CVE-2015-6435 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2015-6435 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-6435?

CVE-2015-6435 primarily affects Cisco Firepower Extensible Operating System. In total, 86 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-6435?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2015-6435 published?

CVE-2015-6435 was published on 2016-01-22 and last updated on 2026-06-17.

CVE-2015-6435

CVE-2015-6435 is a critical-severity vulnerability in Cisco Firepower Extensible Operating System with a CVSS 3.x base score of 9.8. 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-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 9% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Cisco Firepower Extensible Operating System
Published: 2016-01-22
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2015-6435?: 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.
How severe is CVE-2015-6435?: CVE-2015-6435 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2015-6435 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-6435?: CVE-2015-6435 primarily affects Cisco Firepower Extensible Operating System. In total, 86 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-6435?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2015-6435 published?: CVE-2015-6435 was published on 2016-01-22 and last updated on 2026-06-17.

References

Affected products (86)

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\(1i\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(1j\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(1m\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(3i\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(3l\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(3m\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(3q\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(3s\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(3u\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(3y\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(4f\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(4g\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(4i\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(4j\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(4k\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4_base:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:2.0\(1m\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:2.0\(1q\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:2.0\(1s\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:2.0\(1t\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:2.0\(1w\):*:*:*:*:*:*:*

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