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CVE Record

CVE-2019-11856: ALEOS ACEView Message Replay

A nonce reuse vulnerability exists in the ACEView service of ALEOS before 4.13.0, 4.9.5, and 4.4.9 allowing message replay. Captured traffic to the ACEView service can be replayed to other gateways sharing the same credentials.

LowCVSS 3.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

This issue affects the ACEView service in ALEOS versions before 4.13.0, 4.9.5, and 4.4.9. If an attacker has high privileges and captured ACEView traffic, they may replay messages against other gateways that use the same credentials. Business urgency is limited but relevant for fleets using shared credentials.

Executive priority

Treat this as a low-priority hygiene issue unless the organization operates many ALEOS gateways with shared credentials. Prioritize remediation during normal maintenance, but move faster for externally reachable management interfaces.

Technical view

CVE-2019-11856 is a nonce reuse flaw in ALEOS ACEView. The CVSS 3.1 score is 3.3, with network access, high attack complexity, and high privileges required. Impact is limited to integrity and availability. The provided metadata does not list CWE or detailed affected CPEs.

Likely exposure

Exposure is most likely in ALEOS gateway deployments running ACEView below 4.13.0, 4.9.5, or 4.4.9, especially where multiple gateways share credentials. The source bundle does not provide CPEs or a complete product inventory.

Exploitation context

The bundle does not report active exploitation, and the CVE is not listed as KEV. Exploitation requires captured ACEView traffic and shared credentials across gateways, making opportunistic mass exploitation less likely from the available evidence.

Researcher notes

The strongest evidence is the CVE description and Sierra Wireless bulletin reference. Affected metadata is incomplete in the bundle, showing no CPEs and vendor/product as n/a. Avoid overstating scope beyond ALEOS ACEView and the listed version thresholds.

Mitigation direction

  • Upgrade ALEOS to 4.13.0, 4.9.5, 4.4.9, or later where applicable.
  • Check Sierra Wireless guidance for branch-specific upgrade instructions.
  • Remove shared credentials across gateways where operationally possible.
  • Restrict ACEView access to trusted management networks.
  • Monitor for repeated ACEView message patterns across gateways.

Validation and detection

  • Inventory ALEOS gateways and record ACEView exposure status.
  • Compare firmware versions against 4.13.0, 4.9.5, and 4.4.9 thresholds.
  • Confirm whether gateway credentials are shared across devices.
  • Verify management access is restricted to approved networks.
  • Review logs for repeated ACEView requests across separate gateways.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2019-11856 mapping review

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Vulnerability profileCVE Program record
Severity
Low
CVSS
3.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:L

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
3.3CVSS 3.1LowCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:L0.72.5Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

3.3Low
CVSS 3.1 vector shape for CVE-2019-11856Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:L

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.