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Enterprise Server CVE-2017-7420

CRITICAL
Improper Authentication (CWE-287)
2017-08-21 security@opentext.com
Authentication Bypass Enterprise Server Enterprise Developer Enterprise Server Monitor And Control Microfocus
9.8
CVSS 3.0 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-287
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Authentication mechanism validation
MITRE ATT&CK

2 techniques across 2 tactics: Defense Evasion, Initial Access

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. EPSS exploitation probability: 0.96%.
Exploit ScenarioDerived

A remote attacker could bypass authentication mechanisms to gain unauthorized access by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.
Act Now Prioritize within 24-48h. Why: CRITICAL severity.
No patch listed yet 1.0% exploitation probability (EPSS)

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AnalysisAI

An Authentication Bypass (CWE-287) vulnerability in ESMAC (aka Enterprise Server Monitor and Control) in Micro Focus Enterprise Developer and Enterprise Server 2.3 and earlier, 2.3 Update 1 before. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Implement multi-factor authentication, enforce strong password policies, use proven authentication frameworks.

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Technical ContextAI · show details

This vulnerability is classified as Improper Authentication (CWE-287), which allows attackers to bypass authentication mechanisms to gain unauthorized access. An Authentication Bypass (CWE-287) vulnerability in ESMAC (aka Enterprise Server Monitor and Control) in Micro Focus Enterprise Developer and Enterprise Server 2.3 and earlier, 2.3 Update 1 before Hotfix 8, and 2.3 Update 2 before Hotfix 9 allows remote unauthenticated attackers to view and alter configuration information and alter the state of the running product (CWE-275). Affected products include: Microfocus Enterprise Developer, Microfocus Enterprise Server, Microfocus Enterprise Server Monitor And Control.

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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 Authentication Bypass (CWE-287) vulnerability in ESMAC (aka Enterprise Server Monitor and Control) in Micro Focus Enterprise Developer and Enterprise Server 2.3 and earlier, 2.3 Update 1 before Hotfix 8, and 2.3 Update 2 before Hotfix 9 allows remote unauthenticated attackers to view and alter configuration information and alter the state of the running product (CWE-275).

Threat Intelligence Overview

EPSS Score
1.0%
Top 23% 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 CRITICAL
CISA KEV No
Public POC No
EPSS 1.0%
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
Yes
Human Impact· derived
Medium

Priority Score

50
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +49
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:microfocus:enterprise_developer:2.3:*:*:*:*:*:*:*
cpe:2.3:a:microfocus:enterprise_developer:2.3:update1:*:*:*:*:*:*
cpe:2.3:a:microfocus:enterprise_developer:2.3:update2:*:*:*:*:*:*
cpe:2.3:a:microfocus:enterprise_server:*:*:*:*:*:*:*:*
cpe:2.3:a:microfocus:enterprise_server:2.3:update1:*:*:*:*:*:*
cpe:2.3:a:microfocus:enterprise_server:2.3:update2:*:*:*:*:*:*
cpe:2.3:a:microfocus:enterprise_server_monitor_and_control:-:*:*:*:*:*:*:*

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Same technique Authentication Bypass

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References

Advisories & patches
REF https://community.microfocus.com/microfocus/mainframe_solutions/enterprise_server/w/knowledge_base/29131/enterprise-server-security-fixes-july-2017

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