Security readout for executives and security teams
Plain-English summary
CVE-2019-11849 is a stack overflow in ALEOS AT command APIs before version 4.11.0. The sources say it may allow code execution, but the CVSS context requires local access, high privileges, high attack complexity, and user interaction. Treat it as important for managed device fleets, not as an internet-wide emergency.
Executive priority
Prioritize remediation for critical sites or devices with shared administrative access. The vulnerability is not described as remotely exploitable in the provided CVSS vector, but code execution on network equipment can create serious operational and security consequences.
Technical view
The CVE describes a stack overflow in ALEOS AT command API handling before 4.11.0. CVSS 3.1 is 6.3 with AV:L/AC:H/PR:H/UI:R and high confidentiality, integrity, and availability impact. The source bundle does not provide CWE details, exploit mechanics, or affected CPEs.
Likely exposure
Exposure is most likely on systems running ALEOS firmware earlier than 4.11.0 where privileged local users or processes can reach AT command APIs. The provided affected-product metadata is incomplete, so organizations must confirm device models and firmware versions from inventory and Sierra Wireless guidance.
Exploitation context
The bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector indicates exploitation is constrained by local access, high privileges, high complexity, and user interaction, but successful exploitation could have severe device-level impact.
Researcher notes
Evidence is limited to the CVE description, CVSS vector, and Sierra Wireless bulletin reference. No CPEs, CWE, proof-of-concept status, or exploitation reports are present in the bundle. Avoid assuming affected hardware models without vendor confirmation.
Mitigation direction
- Identify ALEOS devices and record firmware versions from authoritative inventory.
- Upgrade affected ALEOS firmware to 4.11.0 or later where vendor guidance confirms applicability.
- Review Sierra Wireless bulletin SWI-PSA-2020-004 for device-specific remediation instructions.
- Restrict local and administrative access to AT command interfaces.
- Monitor vendor advisories for model-specific fixes or compensating controls.
Validation and detection
- Confirm whether any deployed ALEOS firmware is earlier than 4.11.0.
- Verify who or what can access AT command APIs on each device class.
- Check change records for completed firmware updates or vendor-approved mitigations.
- Review logs for unusual privileged local activity involving device management interfaces.
- Document devices where applicability remains unknown due to missing product metadata.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2019-11849 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H
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.
CVSS vector scores
1 official scoreWe 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.
CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H0.35.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.3MediumVector: CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://source.sierrawireless.com/resources/security-bulletins/sierra-wireless-technical-bulletin---swi-psa-2020-004/CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.