CVE-2026-73214

HIGHPre-NVD 8.28.2
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (46th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
8.2EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 8.2Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, dtls_server_input_handler() and create_new_connected_udp_socket() in src/apps/relay/dtls_listener.c retain OpenSSL dtls1_reassemble_fragment() state for a 35-byte fragmented ClientHello declaring a 650,000-byte handshake before cookie validation, allowing an unauthenticated remote sender using fresh UDP tuples to exhaust memory without TURN credentials, a completed handshake, a valid cookie, or source spoofing. This issue is fixed in version 4.16.0.

CVSS v3
8.2
EG Score
8.2HIGHmedium confidence
EG Risk
37
EG Risk 37/100

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 (value × EchelonGraph’s weight)
Severity82% × 45%
The EG Score, 8.2 of 10.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.6%
EPSS %ILE
46th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 11, 2026

Last Modified

September 9, 2026

Advisory Details (6)

Auto-updated Aug 11, 2026
Patch available. Sources: github, github_pr, github_commit, github_release.
GitHub release Patch Available

4.16.0

Patch available: coturn/coturn 4.16.0

https://github.com/coturn/coturn/releases/tag/4.16.0
GitHub commit Patch Available

commit beb4de9dcb6a (coturn/coturn)

Patch available: coturn/coturn docker/4.16.0-r0 (contains commit beb4de9dcb6a)

https://github.com/coturn/coturn/commit/beb4de9dcb6a475129595b943c9a34264420df09
GitHub commit Patch Available

commit 37e13d1d60af (coturn/coturn)

Patch available: coturn/coturn docker/4.16.0-r0 (contains commit 37e13d1d60af)

https://github.com/coturn/coturn/commit/37e13d1d60af8f1422c01b5e9f1c6bc355d03b85
GitHub pull request Patch Available

DTLS: cap concurrent half-open handshakes (pre-cookie state-exhaustion)

Patch available: coturn/coturn docker/4.16.0-r0 (PR #2012 merged 2026-07-26)

https://github.com/coturn/coturn/pull/2012
GitHub pull request Patch Available

DTLS listener: correct the handshake buffer bound and remove the non-functional client-cert path

Patch available: coturn/coturn docker/4.16.0-r0 (PR #2003 merged 2026-07-26)

https://github.com/coturn/coturn/pull/2003
GitHub advisoryMentions a patch (unverified)

coturn allocates a full per-peer SSL/session before verifying the DTLS cookie, enabling source-spoofing/botnet state-exhaustion DoS · Advisory · coturn/coturn · GitHub

https://github.com/coturn/coturn/security/advisories/GHSA-5x2p-4vqj-f6m4

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
coturn4.12.0-1 ... 4.6.1-2 (6 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
coturn4.12.0-1, 4.14.0-1, 4.15.0-1, 4.18.0-1, 4.6.1-2
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
coturn4.12.0-1, 4.14.0-1, 4.15.0-1, 4.6.1-2
  • every version up to 4.18.0-1: fixed in 4.18.0-1
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 48× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 97 of 112 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 3 repeat rows among the latest 100 are merged into the row they repeat. The 15 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  2. 2026-10-13 07:58 UTCEG score recompute
  3. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  4. 2026-10-12 15:41 UTCEG score recompute
  5. 2026-10-11 19:26 UTCEG score recompute
  6. 2026-10-11 16:42 UTCEG score recompute
  7. 2026-10-11 14:02 UTCEG score recompute
  8. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  9. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  11. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  12. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  13. 2026-10-06 17:39 UTCEG score recompute
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  15. 2026-10-05 17:47 UTCEG score recompute
  16. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  17. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  18. 2026-10-03 20:31 UTCEG score recompute
  19. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  20. 2026-10-02 22:18 UTCEG score recompute
  21. 2026-10-02 08:29 UTCEG score recompute
  22. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  23. 2026-09-30 22:04 UTCEG score recompute
  24. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  25. 2026-09-29 05:03 UTCEG score recompute
Show 72 more
  1. 2026-09-28 14:48 UTCEG score recompute
  2. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  3. 2026-09-28 02:10 UTCEG score recompute
  4. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  5. 2026-09-27 10:02 UTCEG score recompute
  6. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  7. 2026-09-25 03:46 UTCEG score recompute
  8. 2026-09-24 00:32 UTCEG score recompute
  9. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  10. 2026-09-22 23:50 UTCEG score recompute
  11. 2026-09-21 22:40 UTCEG score recompute
  12. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  13. 2026-09-21 10:12 UTCEG score recompute
  14. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  15. 2026-09-19 17:02 UTCEG score recompute
  16. 2026-09-19 02:51 UTCEG score recompute
  17. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  18. 2026-09-18 02:08 UTCEG score recompute
  19. 2026-09-17 00:27 UTCEG score recompute
  20. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  21. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  22. 2026-09-15 04:26 UTCEG score recompute
  23. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  24. 2026-09-14 03:38 UTCEG score recompute
  25. 2026-09-13 02:59 UTCEG score recompute
  26. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  27. 2026-09-12 02:19 UTCEG score recompute
  28. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  29. 2026-09-11 13:59 UTCEG score recompute
  30. 2026-09-10 09:49 UTCEG score recompute
  31. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  32. 2026-09-09 05:35 UTCEG score recompute
  33. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  34. 2026-09-07 18:24 UTCEG score recompute
  35. 2026-09-06 15:27 UTCEG score recompute
  36. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  37. 2026-09-06 02:45 UTCEG score recompute
  38. 2026-09-05 01:07 UTCEG score recompute
  39. 2026-09-04 08:06 UTCEG score recompute
  40. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  41. 2026-09-02 23:57 UTCEG score recompute
  42. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  43. 2026-09-02 01:53 UTCEG score recompute
  44. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  45. 2026-09-01 13:18 UTCEG score recompute
  46. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  47. 2026-08-30 22:15 UTCEG score recompute
  48. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  49. 2026-08-30 09:55 UTCEG score recompute
  50. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  51. 2026-08-29 09:08 UTCEG score recompute
  52. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  53. 2026-08-27 21:33 UTCEG score recompute
  54. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  55. 2026-08-26 20:54 UTCEG score recompute
  56. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  57. 2026-08-25 20:08 UTCEG score recompute
  58. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  59. 2026-08-24 19:28 UTCEG score recompute
  60. 2026-08-23 06:27 UTCEG score recompute
  61. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  62. 2026-08-22 05:47 UTCEG score recompute
  63. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  64. 2026-08-21 05:08 UTCEG score recompute
  65. 2026-08-20 22:56 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  66. 2026-08-20 04:17 UTCEG score recompute
  67. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  68. 2026-08-18 15:16 UTCEG score recompute
  69. 2026-08-18 13:49 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  70. 2026-08-17 14:18 UTCEG score recompute
  71. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  72. 2026-08-17 01:59 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-73214?
CVE-2026-73214 is a high-severity vulnerability; its CVE record was published on August 11, 2026. Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, dtlsserverinputhandler() and createnewconnectedudpsocket() in src/apps/relay/dtlslistener.c retain OpenSSL dtls1reassemblefragment() state for a 35-byte fragmented ClientHello declaring a 650,000-byte handshake…
When was the CVE record for CVE-2026-73214 published?
The CVE record for CVE-2026-73214 was published on August 11, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 9, 2026; the record at its source may have been updated since.
Is CVE-2026-73214 actively exploited?
CVE-2026-73214 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (46th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73214?
CVE-2026-73214 has a CVSS base score of 8.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73214?
A fix for CVE-2026-73214 is available: update to the fixed version the vendor names in its advisory.

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