Cloudcnm Secumanager CVE-2020-15336

HIGH

Missing Authentication for Critical Function (CWE-306)

2020-06-26 cve@mitre.org

Authentication Bypass Zyxel Cloudcnm Secumanager

7.5

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-306 OWASP Top 10:2025 A07:2025 - Authentication Failures ASVS 5.0 V6 - Authentication Authentication required for critical functions MITRE ATT&CK 1 technique across 1 tactic: Initial Access 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 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	A remote attacker could access critical functionality without authentication by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.9% exploitation probability (EPSS)

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AnalysisAI

Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has no authentication for /cnr requests. Rated high severity (CVSS 7.5), 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. Require authentication for all sensitive operations, implement defense in depth.

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Technical ContextAI · show details

This vulnerability is classified as Missing Authentication for Critical Function (CWE-306), which allows attackers to access critical functionality without authentication. Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has no authentication for /cnr requests. Affected products include: Zyxel Cloudcnm Secumanager.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

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

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

None

Integrity

High

Availability

None

DescriptionNVD

Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has no authentication for /cnr requests.

Threat Intelligence Overview

EPSS Score

0.9%

Top 43% exploitable

Data Quality

2 sources

Confidence: Low

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 HIGH

CISA KEV No

Public POC No

EPSS 0.9%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

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

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

39

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +38

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)NVD

cpe:2.3:a:zyxel:cloudcnm_secumanager:3.1.0:*:*:*:*:*:*:*

cpe:2.3:a:zyxel:cloudcnm_secumanager:3.1.1:*:*:*:*:*:*:*

More in Cloudcnm Secumanager

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CVE-2020-15323 CRITICAL Act Now POC

Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has the cloud1234 password for the a1@chopin account default credentials. Rat

CVE-2020-15322 CRITICAL Act Now POC

Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has the wbboEZ4BN3ssxAfM hardcoded password for the debian-sys-maint account.

CVE-2020-15321 CRITICAL Act Now POC

Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has the axzyxel password for the livedbuser account. Rated critical severity

CVE-2020-15320 CRITICAL Act Now POC

Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has the axiros password for the root account. Rated critical severity (CVSS 9

CVE-2020-15319 MEDIUM This Month POC

Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has a hardcoded RSA SSH key for the root account within the /opt/mysql chroot

CVE-2020-15318 MEDIUM This Month POC

Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has a hardcoded DSA SSH key for the root account within the /opt/mysql chroot

CVE-2020-15317 MEDIUM This Month POC

Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has a hardcoded RSA SSH key for the root account within the /opt/axess chroot

CVE-2020-15316 MEDIUM This Month POC

Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has a hardcoded ECDSA SSH key for the root account within the /opt/axess chro

CVE-2020-15315 MEDIUM This Month POC

Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has a hardcoded DSA SSH key for the root account within the /opt/axess chroot

CVE-2020-15314 MEDIUM This Month POC

Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has a hardcoded RSA SSH key for the root account. Rated medium severity (CVSS

CVE-2020-15313 MEDIUM This Month POC

Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has a hardcoded ECDSA SSH key for the root account. Rated medium severity (CV

CVE-2020-15312 MEDIUM This Month POC

Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 has a hardcoded DSA SSH key for the root account. Rated medium severity (CVSS

Same weakness CWE-306 – Missing Authentication for Critical Function

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CVE-2025-61757 CRITICAL POC

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Same technique Authentication Bypass

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CVE-2015-3306 CRITICAL POC

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CVE-2025-61882 CRITICAL POC

References

Advisories & patches

ADVISORY https://www.zyxel.com/support/vulnerabilities-of-CloudCNM-SecuManager.shtml REF https://pierrekim.github.io/blog/2020-03-09-zyxel-secumanager-0day-vulnerabilities.html#xmpp-no-auth-cleartext

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