Security readout for executives and security teams
Plain-English summary
This flaw affects Cesanta Mongoose 6.16’s MQTT parser. A malformed MQTT packet can trigger an integer overflow that may make the service hang indefinitely, causing remote denial of service. The source also says an out-of-bounds write may be possible, but the provided evidence does not confirm impact beyond that statement.
Executive priority
Prioritize systems where Mongoose 6.16 handles MQTT from external or low-trust networks. Business urgency is mainly availability risk unless a vendor confirms memory corruption impact. Require asset owners to prove exposure status and vendor remediation path.
Technical view
CVE-2019-19307 is an integer overflow in parse_mqtt in mongoose.c in Cesanta Mongoose 6.16. The reported trigger is a crafted MQTT protocol packet. Documented impact is remote denial of service through an infinite loop, with possible out-of-bounds write noted but not fully evidenced in the bundle.
Likely exposure
Exposure is most likely in products, firmware, appliances, or services embedding Cesanta Mongoose 6.16 with MQTT parsing reachable from an untrusted network. The bundle provides no CPEs, no affected version range beyond 6.16, and no product inventory.
Exploitation context
The CVE is public and references a GitHub issue. The provided bundle does not show CISA KEV listing, active exploitation, weaponized exploit availability, or confirmed real-world attacks. Treat internet-reachable MQTT services as higher priority because the trigger is remote network input.
Researcher notes
The key uncertainty is exploitability beyond denial of service. The CVE description says out-of-bounds write is possible, but the provided sources do not establish conditions, affected deployments, or fixed versions. Avoid assuming all Mongoose users are affected without version and MQTT reachability confirmation.
Mitigation direction
- Identify products or codebases embedding Cesanta Mongoose 6.16.
- Check Cesanta or product-vendor guidance for fixed versions or supported backports.
- Restrict MQTT access to trusted networks where business requirements allow.
- Disable MQTT parsing or exposed MQTT listeners if unused.
- Monitor affected services for hangs, watchdog resets, or repeated malformed traffic.
Validation and detection
- Review SBOMs, firmware manifests, and source trees for Cesanta Mongoose 6.16.
- Confirm whether MQTT handling is compiled, enabled, and network-reachable.
- Map exposed MQTT endpoints and trust boundaries around them.
- Check vendor advisories or issue history for patch status.
- Review operational logs for denial-of-service symptoms around MQTT traffic.
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
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CVE-2019-19307 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/cesanta/mongoose/issues/1055CVE 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.