CVE-2026-6239

MEDIUMPre-NVD 6.86.8—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 92% 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, secondary
Trending — 3 sources updated this week
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.8Exploit: None knownExposed: 0

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

A stack‑based buffer overflow vulnerability exists in Tapo C520WS v2 in the ONVIF CreateUsers service, where the device fails to properly validate the number of XML user nodes during request processing. An authenticated attacker can send a specially crafted ONVIF request containing an excessive number of user entries to trigger memory corruption.

Successful exploitation may cause the ONVIF management service to terminate unexpectedly, resulting in a denial‑of‑service (DoS) condition that disrupts device configuration and management functions.

CVSS v3
6.8
EG Score
6.8(medium)
EG Risk
31(Track)
EG Risk 31/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity68% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

Published

June 5, 2026

Last Modified

July 23, 2026

Advisory Details (3)

Auto-updated Jun 12, 2026
No patch confirmed yet.
generic

Security Advisory: Multiple Vulnerabilities on TP-Link Tapo C520WS (CVE-2026-6239, CVE-2026-6240, CVE-2026-6241, CVE-2026-6242, CVE-2026-34123)

https://www.tp-link.com/us/support/faq/5120/
generic

Download for Tapo C520WS | TP-Link

https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes
generic

Download for Tapo C520WS | TP-Link

https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes

Vendor Advisories for CVE-2026-6239(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 64× 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.

Showing the most recent 100 of 116 total refreshes for this CVE.

  1. 2026-07-27 14:14 UTCEPSS rescore
  2. 2026-07-27 08:38 UTCEG score recompute
  3. 2026-07-27 08:38 UTCGHSA enrichment
  4. 2026-07-26 14:54 UTCEPSS rescore
  5. 2026-07-26 14:54 UTCEPSS rescore
  6. 2026-07-26 07:19 UTCEG score recompute
  7. 2026-07-26 07:19 UTCGHSA enrichment
  8. 2026-07-25 14:18 UTCEPSS rescore
  9. 2026-07-25 14:18 UTCEPSS rescore
  10. 2026-07-24 14:18 UTCEPSS rescore
  11. 2026-07-24 14:18 UTCEPSS rescore
  12. 2026-07-23 14:18 UTCEPSS rescore
  13. 2026-07-23 14:18 UTCEPSS rescore
  14. 2026-07-23 03:22 UTCEG score recompute
  15. 2026-07-22 14:08 UTCEPSS rescore
  16. 2026-07-22 14:08 UTCEPSS rescore
  17. 2026-07-21 15:25 UTCEPSS rescore
  18. 2026-07-21 15:25 UTCEPSS rescore
  19. 2026-07-20 17:08 UTCEPSS rescore
  20. 2026-07-19 14:31 UTCEPSS rescore
  21. 2026-07-19 02:29 UTCEPSS rescore
  22. 2026-07-18 10:04 UTCEPSS rescore
  23. 2026-07-16 17:03 UTCEPSS rescore
  24. 2026-07-15 22:37 UTCGHSA enrichment
  25. 2026-07-15 16:57 UTCEPSS rescore
Show 75 more
  1. 2026-07-15 02:00 UTCEPSS rescore
  2. 2026-07-15 02:00 UTCEPSS rescore
  3. 2026-07-14 02:57 UTCGHSA enrichment
  4. 2026-07-13 22:31 UTCEPSS rescore
  5. 2026-07-13 06:13 UTCEPSS rescore
  6. 2026-07-13 06:13 UTCEPSS rescore
  7. 2026-07-12 05:46 UTCEPSS rescore
  8. 2026-07-11 21:13 UTCGHSA enrichment
  9. 2026-07-11 08:27 UTCEPSS rescore
  10. 2026-07-11 08:27 UTCEPSS rescore
  11. 2026-07-10 21:54 UTCGHSA enrichment
  12. 2026-07-09 19:10 UTCEPSS rescore
  13. 2026-07-09 19:10 UTCEPSS rescore
  14. 2026-07-09 05:22 UTCGHSA enrichment
  15. 2026-07-08 15:16 UTCEPSS rescore
  16. 2026-07-08 15:16 UTCEPSS rescore
  17. 2026-07-08 03:55 UTCGHSA enrichment
  18. 2026-07-07 13:46 UTCEPSS rescore
  19. 2026-07-07 13:46 UTCEPSS rescore
  20. 2026-07-06 16:27 UTCEPSS rescore
  21. 2026-07-06 16:27 UTCEPSS rescore
  22. 2026-07-06 02:23 UTCEPSS rescore
  23. 2026-07-06 02:23 UTCEPSS rescore
  24. 2026-07-05 19:44 UTCGHSA enrichment
  25. 2026-07-05 02:31 UTCEPSS rescore
  26. 2026-07-05 02:30 UTCEPSS rescore
  27. 2026-07-04 20:23 UTCGHSA enrichment
  28. 2026-07-04 06:31 UTCEPSS rescore
  29. 2026-07-04 06:31 UTCEPSS rescore
  30. 2026-07-03 17:28 UTCGHSA enrichment
  31. 2026-07-02 18:12 UTCGHSA enrichment
  32. 2026-07-01 18:09 UTCGHSA enrichment
  33. 2026-07-01 15:07 UTCEPSS rescore
  34. 2026-06-30 23:22 UTCEPSS rescore
  35. 2026-06-30 18:02 UTCGHSA enrichment
  36. 2026-06-29 14:06 UTCEPSS rescore
  37. 2026-06-29 13:04 UTCGHSA enrichment
  38. 2026-06-28 14:07 UTCEPSS rescore
  39. 2026-06-28 13:47 UTCGHSA enrichment
  40. 2026-06-28 04:56 UTCEPSS rescore
  41. 2026-06-27 14:31 UTCGHSA enrichment
  42. 2026-06-27 03:08 UTCEPSS rescore
  43. 2026-06-26 15:13 UTCGHSA enrichment
  44. 2026-06-25 15:57 UTCGHSA enrichment
  45. 2026-06-25 13:50 UTCEPSS rescore
  46. 2026-06-24 16:35 UTCGHSA enrichment
  47. 2026-06-24 14:05 UTCEPSS rescore
  48. 2026-06-23 21:33 UTCEPSS rescore
  49. 2026-06-23 21:33 UTCEPSS rescore
  50. 2026-06-23 17:18 UTCGHSA enrichment
  51. 2026-06-22 14:25 UTCEPSS rescore
  52. 2026-06-22 14:25 UTCEPSS rescore
  53. 2026-06-22 06:23 UTCGHSA enrichment
  54. 2026-06-21 14:56 UTCEPSS rescore
  55. 2026-06-21 14:56 UTCEPSS rescore
  56. 2026-06-21 01:59 UTCEPSS rescore
  57. 2026-06-21 01:59 UTCEPSS rescore
  58. 2026-06-20 21:59 UTCGHSA enrichment
  59. 2026-06-19 19:26 UTCEPSS rescore
  60. 2026-06-19 19:26 UTCEPSS rescore
  61. 2026-06-19 19:06 UTCGHSA enrichment
  62. 2026-06-18 17:52 UTCEPSS rescore
  63. 2026-06-18 17:52 UTCEPSS rescore
  64. 2026-06-18 16:31 UTCGHSA enrichment
  65. 2026-06-17 17:53 UTCEPSS rescore
  66. 2026-06-17 17:15 UTCGHSA enrichment
  67. 2026-06-16 17:59 UTCGHSA enrichment
  68. 2026-06-16 17:53 UTCEPSS rescore
  69. 2026-06-15 18:35 UTCGHSA enrichment
  70. 2026-06-15 17:49 UTCEPSS rescore
  71. 2026-06-15 17:49 UTCEPSS rescore
  72. 2026-06-14 23:18 UTCEPSS rescore
  73. 2026-06-14 18:07 UTCGHSA enrichment
  74. 2026-06-13 23:00 UTCEPSS rescore
  75. 2026-06-13 18:34 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-6239?
CVE-2026-6239 is a medium vulnerability published on June 5, 2026. A stack‑based buffer overflow vulnerability exists in Tapo C520WS v2 in the ONVIF CreateUsers service, where the device fails to properly validate the number of XML user nodes during request processing. An authenticated attacker can send a specially crafted ONVIF request containing an excessive…
When was CVE-2026-6239 disclosed?
CVE-2026-6239 was first published in the National Vulnerability Database on June 5, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6239 actively exploited?
CVE-2026-6239 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 92.1% of all scored CVEs.
What is the CVSS score of CVE-2026-6239?
CVE-2026-6239 has a CVSS v3 base score of 6.8 (NVD).
How do I remediate CVE-2026-6239?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6239, 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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