Security readout for executives and security teams
Plain-English summary
Cesanta Mongoose 6.8 contains a critical network-exposed flaw in its MQTT handling. A remote attacker could send a malicious MQTT subscription message and potentially run code on the affected system. This matters most for embedded products, appliances, or services that bundle this library and expose MQTT to untrusted networks.
Executive priority
Treat this as high urgency where Mongoose 6.8 and MQTT are exposed to untrusted networks. The business risk is potential system compromise without credentials. If exposure is only internal or unconfirmed, prioritize inventory first, then remediate confirmed reachable deployments.
Technical view
CVE-2017-2894 is a stack buffer overflow in Mongoose 6.8 MQTT SUBSCRIBE packet parsing. The CVSS 3.0 score is 9.8, reflecting network attackability, low complexity, no privileges, no user interaction, and potential full confidentiality, integrity, and availability impact.
Likely exposure
Likely exposure is systems, firmware, or applications using Cesanta Mongoose 6.8 with MQTT packet parsing reachable over a network. Exposure may be indirect where Mongoose is statically embedded in a product rather than installed as a visible package.
Exploitation context
The sources describe remote code execution via a specially crafted MQTT SUBSCRIBE packet. The source bundle does not include KEV listing or other cited evidence of active exploitation, so active exploitation should not be assumed from this record alone.
Researcher notes
The record is specific to Cesanta Mongoose 6.8 and MQTT SUBSCRIBE parsing. Do not generalize to all Mongoose versions without vendor evidence. The provided bundle names Talos as the technical reference but does not include patch details or confirmed exploitation status.
Mitigation direction
- Inventory products and services that embed Cesanta Mongoose 6.8.
- Check Cesanta or vendor guidance for fixed versions or supported remediation.
- Restrict MQTT access to trusted networks while remediation is planned.
- Remove or disable exposed MQTT functionality where it is not required.
- Prioritize remediation for internet-facing or untrusted-network deployments.
Validation and detection
- Confirm Mongoose version through SBOMs, source manifests, firmware analysis, or vendor attestations.
- Identify whether MQTT parsing is enabled and reachable over any network interface.
- Review firewall, gateway, and broker exposure for untrusted MQTT access paths.
- Verify remediation against vendor guidance rather than assuming generic library replacement is sufficient.
- Monitor network and application logs for unexpected MQTT subscription activity.
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-2017-2894 mapping review
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Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
9.8CriticalVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2017-0401CVE 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.