CVE-2026-73216

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (45th 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
Elevated
6.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 6.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.17.0, shutdown_client_connection() in src/server/ns_turn_server.c prematurely calls dec_quota() and releases bandwidth accounting during the first-stage close of a mobility-enabled allocation while preserving the allocation, relay socket, session, and mobility ticket, allowing an authenticated client to bypass --user-quota and --total-quota and exhaust relay ports. This issue is fixed in version 4.17.0.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
45
EG Risk 45/100

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)
Severity65% × 45%
The EG Score, 6.5 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (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
45th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation public PoC (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 (3)

Auto-updated Aug 11, 2026
Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)

coturn: mobility disconnects bypass allocation quotas and exhaust relay capacity · Advisory · coturn/coturn · GitHub

https://github.com/coturn/coturn/security/advisories/GHSA-f6hc-79w3-p8pq
GitHub release Patch Available

4.17.0

Patch available: coturn/coturn 4.17.0

https://github.com/coturn/coturn/releases/tag/4.17.0
GitHub commit Patch Available

commit 3c5b2615fd40 (coturn/coturn)

Patch available: coturn/coturn 4.17.0 (contains commit 3c5b2615fd40)

https://github.com/coturn/coturn/commit/3c5b2615fd405c4e7c5bf3fbeef895c94a90671b

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(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 43× 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 96 of 102 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. 4 repeat rows among the latest 100 are merged into the row they repeat. The 6 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% · 45th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  3. 2026-10-12 15:41 UTCEG score recompute
  4. 2026-10-11 19:26 UTCEG score recompute
  5. 2026-10-11 16:42 UTCEG score recompute
  6. 2026-10-11 14:02 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  10. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  12. 2026-10-06 17:39 UTCEG score recompute
  13. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  14. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  15. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  16. 2026-10-03 20:31 UTCEG score recompute
  17. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  18. 2026-10-02 08:29 UTCEG score recompute
  19. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  20. 2026-09-30 22:04 UTCEG score recompute
  21. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  22. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  23. 2026-09-28 11:24 UTCEG score recompute
  24. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  25. 2026-09-27 10:02 UTCEG score recompute
Show 71 more
  1. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  2. 2026-09-25 03:46 UTCEG score recompute
  3. 2026-09-23 23:34 UTCEG score recompute
  4. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  5. 2026-09-22 21:38 UTCEG score recompute
  6. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  7. 2026-09-21 20:17 UTCEG score recompute
  8. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  9. 2026-09-20 17:26 UTCEG score recompute
  10. 2026-09-19 12:17 UTCEG score recompute
  11. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  12. 2026-09-18 08:29 UTCEG score recompute
  13. 2026-09-17 07:07 UTCEG score recompute
  14. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  15. 2026-09-16 05:46 UTCEG score recompute
  16. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  17. 2026-09-15 04:26 UTCEG score recompute
  18. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  19. 2026-09-14 02:58 UTCEG score recompute
  20. 2026-09-13 01:38 UTCEG score recompute
  21. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  22. 2026-09-12 00:17 UTCEG score recompute
  23. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  24. 2026-09-10 22:50 UTCEG score recompute
  25. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  26. 2026-09-09 08:44 UTCEG score recompute
  27. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  28. 2026-09-08 07:23 UTCEG score recompute
  29. 2026-09-07 06:03 UTCEG score recompute
  30. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  31. 2026-09-06 04:37 UTCEG score recompute
  32. 2026-09-05 03:16 UTCEG score recompute
  33. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  34. 2026-09-02 23:57 UTCEG score recompute
  35. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  36. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  37. 2026-09-01 13:18 UTCEG score recompute
  38. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  39. 2026-08-31 11:47 UTCEG score recompute
  40. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  41. 2026-08-30 10:26 UTCEG score recompute
  42. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  43. 2026-08-29 09:05 UTCEG score recompute
  44. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  45. 2026-08-27 19:39 UTCEG score recompute
  46. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  47. 2026-08-26 16:29 UTCEG score recompute
  48. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  49. 2026-08-25 14:27 UTCEG score recompute
  50. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  51. 2026-08-24 13:06 UTCEG score recompute
  52. 2026-08-23 11:45 UTCEG score recompute
  53. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  54. 2026-08-22 10:25 UTCEG score recompute
  55. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  56. 2026-08-21 09:04 UTCEG score recompute
  57. 2026-08-20 22:56 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  58. 2026-08-20 07:43 UTCEG score recompute
  59. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  60. 2026-08-19 06:22 UTCEG score recompute
  61. 2026-08-18 13:49 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  62. 2026-08-18 04:40 UTCEG score recompute
  63. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  64. 2026-08-17 03:20 UTCEG score recompute
  65. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  66. 2026-08-16 02:15 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  67. 2026-08-16 02:00 UTCEG score recompute
  68. 2026-08-15 01:31 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  69. 2026-08-13 23:18 UTCEG score recompute
  70. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  71. 2026-08-12 21:58 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-73216?
CVE-2026-73216 is a medium-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 4.17.0, shutdownclientconnection() in src/server/nsturnserver.c prematurely calls dec_quota() and releases bandwidth accounting during the first-stage close of a mobility-enabled allocation while preserving the…
When was the CVE record for CVE-2026-73216 published?
The CVE record for CVE-2026-73216 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-2026-73216 actively exploited?
CVE-2026-73216 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (45th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73216?
CVE-2026-73216 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73216?
A fix for CVE-2026-73216 is available: update to the fixed version the vendor names in its advisory.

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