CVE-2025-68699

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 67% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In version 0.24.6, NanoMQ has a protocol parsing / forwarding inconsistency when handling shared subscriptions ($share/). A malformed SUBSCRIBE topic such as $share/ab (missing the second /) is not strictly validated during the subscription stage, so the invalid Topic Filter is stored into the subscription table. Later, when any PUBLISH matches this subscription, the broker send path (nmq_pipe_send_start_v4/v5) performs a second $share/ parsing using strchr() and increments the returned pointer without NULL checks. If the second strchr() returns NULL, sub_topic++ turns the pointer into an invalid address (e.g. 0x1). This invalid pointer is then passed into topic_filtern(), which triggers strlen() and crashes with SIGSEGV. The crash is stable and remotely triggerable. This issue has been patched in version 0.24.7.

CVSS v3
6.5
EG Score
6.5(medium)
EPSS
18.0%
KEV
Not listed

Published

February 4, 2026

Last Modified

February 20, 2026

References (2)

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-16 17:02 UTCEPSS rescore
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  7. 2026-07-13 08:07 UTCOSV refresh
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  1. 2026-06-29 14:06 UTCEPSS rescore
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  7. 2026-06-25 13:49 UTCEPSS rescore
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  9. 2026-06-24 22:01 UTCOSV refresh
  10. 2026-06-24 14:05 UTCEPSS rescore
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  44. 2026-06-04 13:12 UTCEPSS rescore
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  46. 2026-06-02 20:13 UTCEPSS rescore
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  49. 2026-05-31 22:30 UTCEPSS rescore
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  51. 2026-05-31 00:16 UTCEPSS rescore
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  53. 2026-05-29 14:37 UTCEG score recompute
  54. 2026-05-29 13:44 UTCEPSS rescore
  55. 2026-05-29 13:44 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2025-68699?
CVE-2025-68699 is a medium vulnerability published on February 4, 2026. NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In version 0.24.6, NanoMQ has a protocol parsing / forwarding inconsistency when handling shared subscriptions ($share/). A malformed SUBSCRIBE topic such as $share/ab (missing the second /) is not strictly validated during the…
When was CVE-2025-68699 disclosed?
CVE-2025-68699 was first published in the National Vulnerability Database on February 4, 2026, with the most recent update on February 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-68699 actively exploited?
CVE-2025-68699 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 18.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-68699?
CVE-2025-68699 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2025-68699?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-68699, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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