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Unified Computing System CVE-2015-0633

MEDIUM
Improper Input Validation (CWE-20)
2015-02-26 psirt@cisco.com
Authentication Bypass Cisco Unified Computing System
6.8
CVSS 2.0 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-20
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V2 - Validation and Business Logic Input validation, allowlisting
Impact

CVSS score of 6.8 (MEDIUM). Attack characteristics: adjacent network attack vector, low complexity. EPSS exploitation probability: 0.27%.
Exploit ScenarioDerived

Successful exploitation could compromise the medium-severity affected system.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.3% exploitation probability (EPSS)

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AnalysisAI

The Integrated Management Controller (IMC) in Cisco Unified Computing System (UCS) 1.4(7h) and earlier on C-Series servers allows remote attackers to bypass intended access restrictions by sending. Rated medium severity (CVSS 6.8), this vulnerability is low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

This vulnerability is classified under CWE-20. The Integrated Management Controller (IMC) in Cisco Unified Computing System (UCS) 1.4(7h) and earlier on C-Series servers allows remote attackers to bypass intended access restrictions by sending crafted DHCP response packets on the local network, aka Bug ID CSCuf52876. Affected products include: Cisco Unified Computing System.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 6.8 MEDIUM
AV:A/AC:L/Au:N/C:N/I:P/A:C

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Adjacent
Attack Complexity
Low
Confidentiality
None
Integrity
P
Availability
C

DescriptionCVE.org

The Integrated Management Controller (IMC) in Cisco Unified Computing System (UCS) 1.4(7h) and earlier on C-Series servers allows remote attackers to bypass intended access restrictions by sending crafted DHCP response packets on the local network, aka Bug ID CSCuf52876.

Threat Intelligence Overview

EPSS Score
0.3%
Top 50% exploitable
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 MEDIUM
CISA KEV No
Public POC No
EPSS 0.3%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
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
None
System Exposure· derived
Controlled
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

34
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +34
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)CVE.org

cpe:2.3:a:cisco:unified_computing_system:1.4:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(1c\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(2\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(3c\)1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(3c\)2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(3j\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(3k\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(3p\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(3p\)5:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(3s\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(4a\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(4a\)1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(5b\)1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(5e\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(5g\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(5g\)2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(5h\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(5j\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(6c\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_computing_system:1.4\(6d\):*:*:*:*:*:*:*
+ 3 more

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Same weakness CWE-20 – Improper Input Validation

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CVE-2023-22515 CRITICAL POC
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CVE-2009-0927 HIGH POC
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CVE-2017-9791 CRITICAL POC
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CVE-2017-15944 CRITICAL POC
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CVE-2019-0604 CRITICAL POC
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Same technique Authentication Bypass

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CVE-2015-3306 CRITICAL POC
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CVE-2012-4681 CRITICAL POC
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CVE-2013-2465 CRITICAL POC
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CVE-2011-3544 CRITICAL POC
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CVE-2022-40684 CRITICAL POC
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CVE-2025-61882 CRITICAL POC
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CVE-2024-0012 CRITICAL POC
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References

Advisories & patches
ADVISORY http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2015-0633 ADVISORY http://tools.cisco.com/security/center/viewAlert.x?alertId=37575 REF http://www.securityfocus.com/bid/72760 REF http://www.securityfocus.com/bid/85711 REF http://www.securitytracker.com/id/1031796

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