What is the CVSS score of CVE-2015-5538?

CVE-2015-5538 has a CVSS 2.0 base score of 10.0 (Critical). CVSS vector: AV:N/AC:L/Au:N/C:C/I:C/A:C. EPSS exploitation probability: 2.0%.

Netscaler Application Delivery Controller Firmware CVE-2015-5538

CRITICAL

2015-09-17 cve@mitre.org

Information Disclosure Citrix Netscaler Application Delivery Controller Firmware Netscaler Gateway Firmware

10.0

CVSS 2.0 · NVD

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Vulnerability Assessment

Impact	CVSS score of 10.0 (CRITICAL). Attack characteristics: network attack vector, low complexity. EPSS exploitation probability: 1.96%.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the critical-severity affected system.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.

No patch listed yet 2.0% exploitation probability (EPSS)

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AnalysisAI

Multiple unspecified vulnerabilities in Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway before 10.1 Build 132.8, 10.5 before Build 57.7, and 10.5e before Build 56.1505.e. Rated critical severity (CVSS 10.0), this vulnerability is remotely exploitable, 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

Multiple unspecified vulnerabilities in Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway before 10.1 Build 132.8, 10.5 before Build 57.7, and 10.5e before Build 56.1505.e allow remote attackers to gain privileges via unknown vectors, related to the (1) Command Line Interface (CLI) and the (2) Web User Interface (UI). Affected products include: Citrix Netscaler Application Delivery Controller Firmware, Citrix Netscaler Gateway Firmware. Version information: before 10.1.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 10.0 CRITICAL

AV:N/AC:L/Au:N/C:C/I:C/A:C

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Confidentiality

Integrity

Availability

DescriptionCVE.org

Threat Intelligence Overview

EPSS Score

2.0%

Top 16% exploitable

Data Quality

3 sources

Confidence: Low

Citrix

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 No

EPSS 2.0%

Patch available No

Active threat No

Deciding rule

CRITICAL severity

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

Open

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +2

CVSS: +50

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)CVE.org

cpe:2.3:o:citrix:netscaler_application_delivery_controller_firmware:10.1:*:*:*:*:*:*:*

cpe:2.3:o:citrix:netscaler_application_delivery_controller_firmware:10.5:*:*:*:*:*:*:*

cpe:2.3:o:citrix:netscaler_application_delivery_controller_firmware:10.5e:*:*:*:*:*:*:*

cpe:2.3:o:citrix:netscaler_gateway_firmware:10.1:*:*:*:*:*:*:*

cpe:2.3:o:citrix:netscaler_gateway_firmware:10.5:*:*:*:*:*:*:*

cpe:2.3:o:citrix:netscaler_gateway_firmware:10.5e:*:*:*:*:*:*:*

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References

Advisories & patches

ADVISORY http://support.citrix.com/article/CTX201334 REF http://www.securitytracker.com/id/1033618

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GitHub PoC

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