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CVE Record

CVE-2026-101039: FAST FAC1900R devdiscover Service copy_msg_element stack-based overflow

A vulnerability was identified in FAST FAC1900R 20190827_2.0.2. Affected by this issue is the function copy_msg_element of the component devdiscover Service. Such manipulation leads to stack-based buffer overflow. The attack can be executed remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.

CriticalCVSS 10Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

A critical memory-handling flaw affects FAST FAC1900R version 20190827_2.0.2. A remote attacker could potentially compromise an affected device or interrupt its operation if its discovery service is reachable. Public exploit availability increases urgency, but the supplied evidence does not establish attacks in the wild or identify a confirmed fix.

Executive priority

Prioritize immediate inventory and exposure assessment. Give reachable affected devices urgent containment attention because the reported severity is critical and an exploit is public. Assign an owner to obtain vendor guidance and track remediation. Business impact depends on device roles and network access, neither of which is established by the bundle.

Technical view

The devdiscover service's copy_msg_element function contains a stack-based buffer overflow, classified as CWE-119 and CWE-121. The supplied CVSS 4.0 score is 10.0, describing network exploitation with low complexity, no privileges, and no user interaction. The vector assigns high confidentiality, integrity, and availability impacts to vulnerable and subsequent systems; these ratings do not independently demonstrate those outcomes.

Likely exposure

The explicitly identified affected version is FAST FAC1900R 20190827_2.0.2. Exposure depends on attacker reachability to the devdiscover service. The bundle does not specify service ports, default enablement, internet exposure, or other affected versions. The wildcard CPE alone does not establish that every version is vulnerable.

Exploitation context

The supplied description reports a publicly available exploit and links a GitHub repository. The CVSS vector includes E:P. The bundle marks KEV membership false and provides no evidence of active exploitation. It also reports that the vendor was contacted but did not respond; this does not establish the current availability of vendor guidance.

Researcher notes

This assessment uses only the supplied bundle; linked materials were not independently inspected. Missing details include service transport and ports, exploit reliability, demonstrated execution outcomes, affected-version boundaries, and remediation status. Treat public exploit availability as a reported fact, not independently validated capability. Network reachability should not be equated with confirmed internet exposure.

Mitigation direction

  • Check vendor guidance for a confirmed fix, affected-version clarification, and supported temporary mitigations; none is named in the bundle.
  • As an interim precaution, restrict untrusted network access to affected devices and their discovery service, subject to operational requirements.
  • If exposure cannot be restricted, assess isolating affected devices pending vendor guidance.

Validation and detection

  • Inventory FAST FAC1900R devices and verify whether their installed version matches 20190827_2.0.2.
  • Review network configuration and access controls to establish whether untrusted networks can reach the devdiscover service.
  • Confirm any proposed remediation against vendor guidance and verify the resulting installed version and service exposure.
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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-119: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cwe · low confidence lookup

CWE-121: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-101039 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Critical
CVSS
10 (4.0)
Known Exploited
No
Published

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P

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.

4CVSS vectors
6Timeline events
1ADP providers
6Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: pocAutomatable: yesTechnical Impact: total

CVSS vector scores

4 official scores

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
10CVSS 4.0CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P——VulDB
10CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R3.96VulDB
10CVSS 3.0CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R3.96VulDB
10CVSS 2.0CriticalAV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR1010VulDB

Vulnerability scoring details

Base CVSS 4.0 score

10Critical
CVSS 4.0 vector shape for CVE-2026-101039Attack VectorAttack ComplexityAttack RequirementsPrivileges RequiredUser InteractionVS ConfidentialityVS IntegrityVS AvailabilitySS ConfidentialitySS IntegritySS Availability

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Attack Requirements
NonePresent
Privileges Required
NoneLowHigh
User Interaction
NonePassiveActive
VS Confidentiality
HighLowNone
VS Integrity
HighLowNone
VS Availability
HighLowNone
SS Confidentiality
HighLowNone
SS Integrity
HighLowNone
SS Availability
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. Source timelineVulDB

    Advisory disclosed

  2. Source timelineVulDB

    VulDB entry created

  3. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  4. Source timelineVulDB

    VulDB entry last update

  5. CVE publishedCVE Program

    The CVE record was published.

  6. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
FASTFAC1900R20190827_2.0.2Listed
Weakness

CWE details

CWE-119CWE-121

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