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Amc Manager CVE-2026-32960

| EUVDEUVD-2026-23753 HIGH
Sensitive Information in Resource Not Removed Before Reuse (CWE-226)
2026-04-20 jpcert GHSA-g7hc-x6qw-m35g
7.1
CVSS 4.0 · NVD
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Gain network access to management interface
  2. Delivery
    Monitor for legitimate user activity
  3. Exploit
    Send crafted packet during memory reuse window
  4. Execution
    Bypass authentication via stale credential data
  5. Persist
    Gain administrative access
  6. Impact
    Modify device configuration or exfiltrate network data

Vulnerability Assessment

Weakness
CWE
ASVS 5.0
V14 - Data Protection Sensitive info in resource not removed before reuse
Exploitation Conditions

Requires network access to SD-330AC management interface or AMC Manager web console. User interaction is required (CVSS 4.0 UI:P), indicating successful exploitation depends on timing coordination with legitimate administrator activity or specific user-triggered conditions that cause memory reuse patterns. No authentication credentials needed (PR:N), but the UI:P constraint suggests attackers must either predict when administrators will access the system to create vulnerable memory states, or social engineer users to trigger the condition. Exploitation is limited to installations where administrative interfaces are network-accessible to potential attackers - devices on isolated management VLANs or with IP-restricted access controls significantly reduce exploitability. Attack does not work against offline devices or those without active user sessions creating the memory residue condition.

Impact

Real-world risk is moderate despite the 7.1 CVSS score. SSVC assessment shows no active exploitation, non-automatable attack requiring user interaction, and partial technical impact (integrity compromise without confidentiality or availability effects). CVSS 4.0 vector (AV:N/AC:L/PR:N/UI:P) confirms network accessibility but highlights the UI:P requirement as a limiting factor - attackers cannot exploit this remotely without user presence or action on the device. EPSS score of 0.03% (7th percentile) aligns with SSVC findings, indicating security researchers and threat actors have not prioritized this vulnerability. The high integrity impact (VI:H) reflects authentication bypass severity, but scope is unchanged (SC:N/SI:N/SA:N), meaning compromise is contained to the vulnerable component. This is NOT a critical exposure for most organizations - prioritize for internet-facing SD-330AC devices and AMC Manager instances in environments where attackers have network proximity and can coordinate with user activity. Lower priority for air-gapped networks or installations with compensating network access controls. Data is consistent across sources with no conflicting signals, though exact attack mechanics are not detailed in public advisories.

Exploit ScenarioDerived

Attacker on the same network as SD-330AC device monitors legitimate administrator login traffic to establish timing patterns. When admin initiates a session, attacker sends crafted authentication packet designed to reference residual session tokens or credential hashes left in memory from the prior allocation cycle. Due to insufficient memory sanitization (CWE-226), the device's authentication handler processes the stale data as valid credentials, granting unauthorized administrative access without requiring the actual password. Attacker modifies device configuration, intercepts wireless traffic, or pivots to connected networks. Attack requires network proximity and timing coordination with legitimate user activity (explaining UI:P constraint), but public exploit code has not been identified at time of analysis.

Act Now Prioritize within 24-48h. Why: Active threat signals + CRITICAL/HIGH severity.
No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv3 – Apr 20, 2026

Authentication bypass in silex technology SD-330AC (≤1.42) and AMC Manager (≤5.0.2) allows remote attackers to gain unauthorized access by sending specially crafted packets that exploit residual sensitive data in memory. Attacker can log in without valid credentials due to improper clearance of authentication tokens or session data between requests. EPSS score of 0.03% (7th percentile) indicates low observed exploitation probability. JPCERT/CC reported this vulnerability, and vendor advisory confirms patches are available. Requires user interaction (CVSS 4.0 UI:P), limiting automated exploitation.

Earlier versions of this analysis (2)
v2 Apr 20, 2026 - 04:30 cvss changed CVSS 7.1

Authentication bypass in Silex Technology SD-330AC access points and AMC Manager allows remote attackers to gain unauthorized administrative access by sending specially crafted packets that exploit residual sensitive data in memory. CVSS 7.1 (CVSS 4.0) with network attack vector but requiring user interaction. No active exploitation confirmed (not in CISA KEV), but JPCERT coordination suggests vendor-confirmed issue with available advisory.

v1 Apr 20, 2026 - 04:10 CVSS 6.5

Silex Technology SD-330AC and AMC Manager devices allow unauthenticated remote attackers to bypass authentication and gain unauthorized access by sending a crafted packet that exploits improper handling of sensitive authentication data in memory. The vulnerability stems from failure to remove cached credentials or authentication tokens before reuse, enabling attackers to impersonate legitimate users without password knowledge. CVSS 6.5 indicates moderate integrity impact; however, the requirement for user interaction (UI:R) and lack of confidentiality breach reduce immediate risk compared to network-accessible services with full remote code execution.

RemediationAI

Upgrade SD-330AC devices to firmware version 1.43 or later, and upgrade AMC Manager to version 5.0.3 or later per silex technology security advisory 2026-001 (https://www.silex.jp/support/security-advisories/en/2026-001). Patches address the memory sanitization issue by implementing proper clearing of authentication buffers after each session. If immediate patching is not feasible, implement network segmentation to restrict access to SD-330AC and AMC Manager interfaces to trusted management VLANs only - do NOT expose administrative interfaces to general corporate networks or the internet. Deploy strict firewall rules permitting connections only from dedicated jump hosts or management workstations with known IP addresses. Enable authentication logging and monitor for repeated failed login attempts followed by unexplained successful logins, which may indicate exploitation attempts. Note that network restrictions reduce attack surface but do not eliminate the vulnerability - insider threats or lateral movement scenarios remain exploitable until patching is complete. Review authentication logs from 60 days prior to patching for anomalous login patterns.

Affected VersionsENISA

SD-330AC Ver.1.42 and earlier
AMC Manager Ver.5.0.2 and earlier

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Technical ContextAI · show details

This vulnerability affects silex technology's SD-330AC wireless access point/bridge device and AMC Manager network management software. The root cause is CWE-226 (Sensitive Information in Resource Not Removed Before Reuse), a memory management flaw where authentication credentials, session tokens, or cryptographic material persist in allocated memory after use. When processing subsequent requests, the application reuses this memory without proper sanitization, allowing attackers to craft packets that trigger authentication logic to reference stale credential data. The CVSS 4.0 vector indicates network-accessible exploitation with low complexity but requires user interaction, suggesting the attack may need timing coordination with legitimate user activity or social engineering to trigger the vulnerable code path. CPE identifiers confirm both products share the same underlying authentication framework prone to this memory hygiene issue.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.1 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
Passive
Vulnerable system: Confidentiality
None
Vulnerable system: Integrity
High
Vulnerable system: Availability
None
Subsequent system: Confidentiality
None
Subsequent system: Integrity
None
Subsequent system: Availability
None

Lifecycle Timeline

3
Severity Changed
Apr 20, 2026 - 04:22 NVD
MEDIUM HIGH
CVSS changed
Apr 20, 2026 - 04:22 NVD
6.5 (MEDIUM) 7.1 (HIGH)
CVE Published
Apr 20, 2026 - 03:18 nvd
HIGH 7.1

DescriptionCVE.org

SD-330AC and AMC Manager provided by silex technology, Inc. contain an issue with a sensitive information in resource not removed before reuse. An attacker may login to the device without knowing the password by sending a crafted packet.

Executive ViewAI

Why It Matters

Silex Technology SD-330AC access points and AMC Manager contain an authentication bypass vulnerability allowing remote attackers to obtain unauthorized administrative access through crafted network packets. This affects wireless network infrastructure and management systems, potentially granting attackers control over network access points and administrative functions without valid credentials.

Business Impact: High
Compensating Controls

No vendor-released patch identified at time of analysis. Interim mitigations: restrict network access to SD-330AC management interfaces and AMC Manager using firewall rules and network segmentation; disable remote administrative interfaces if operationally acceptable; monitor administrative access logs for suspicious authentication attempts; consider temporary replacement with patched alternative devices if business continuity permits.

Threat Intelligence Overview

EPSS Score
0.0%
Top 93% exploitable
Threat Intel
1
1 source
Social Media
1
Sightings
Data Quality
6 sources
Confidence: High

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 0.0%
Patch available No
Active threat Yes
Deciding rule
Active threat signals + CRITICAL/HIGH 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
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact
High
Technical Impact
Partial

Priority Score

46
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +36
PoC: 0
Weaponized: 0
Threat intel: +10
Gov advisory: 0

Attack Technique

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

Threat IntelligenceMISP

CISA Advisories
Sources: CISA (public domain)

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