CVE-2026-68552

MEDIUMPre-NVD 5.35.3
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (42nd 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
5.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 5.3Exploit: 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 4.15.0, an unauthenticated remote client can send a STUN message over TCP or TLS with a body-length field from 65520 through 65532, causing the uint16_t len variable in stun_get_message_len_str() in src/client/ns_turn_msg.c to wrap when STUN_HEADER_LENGTH is added. The framing layer then consumes only 4 through 16 bytes, treats the remaining bytes as another message, desynchronizes the stream parser, and drops the attacking client's connection. Other clients and the server process are not affected. This issue is fixed in version 4.15.0.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100

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)
Severity53% × 45%
The EG Score, 5.3 of 10.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
42nd
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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 19, 2026

Last Modified

September 9, 2026

Advisory Details (4)

Auto-updated Aug 19, 2026
Patch available. Sources: github_commit, github_release, github, github_pr.
GitHub release Patch Available

4.15.0

Patch available: coturn/coturn 4.15.0

https://github.com/coturn/coturn/releases/tag/4.15.0
GitHub commit Patch Available

commit ed32e1fb6c84 (coturn/coturn)

Patch available: coturn/coturn 4.15.0 (contains commit ed32e1fb6c84)

https://github.com/coturn/coturn/commit/ed32e1fb6c843f9cf9a28d91c541dfbf40874f25
GitHub pull request Patch Available

fix: avoid uint16_t truncation overflow in STUN message length

Patch available: coturn/coturn 4.15.0 (PR #1964 merged 2026-06-27)

https://github.com/coturn/coturn/pull/1964
GitHub advisoryMentions a patch (unverified)

uint16_t truncation overflow in STUN message length causes TCP stream framing bypass · Advisory · coturn/coturn · GitHub

https://github.com/coturn/coturn/security/advisories/GHSA-m562-mf7x-q7rr

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, 4.6.1-2
  • every version up to 4.15.0-1: fixed in 4.15.0-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 45× 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.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  3. 2026-10-12 15:45 UTCEG score recompute
  4. 2026-10-11 19:30 UTCEG score recompute
  5. 2026-10-11 16:45 UTCEG score recompute
  6. 2026-10-11 14:06 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  10. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  11. 2026-10-08 06:26 UTCEG score recompute
  12. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  13. 2026-10-07 04:30 UTCEG score recompute
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  15. 2026-10-06 03:45 UTCEG score recompute
  16. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  17. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  18. 2026-10-03 16:53 UTCEG score recompute
  19. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  20. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  21. 2026-10-02 10:04 UTCEG score recompute
  22. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  23. 2026-10-01 09:20 UTCEG score recompute
  24. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  25. 2026-09-30 08:35 UTCEG score recompute
Show 64 more
  1. 2026-09-29 05:53 UTCEG score recompute
  2. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  3. 2026-09-28 05:09 UTCEG score recompute
  4. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  5. 2026-09-27 04:24 UTCEG score recompute
  6. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  7. 2026-09-25 13:05 UTCEG score recompute
  8. 2026-09-23 11:28 UTCEG score recompute
  9. 2026-09-22 10:43 UTCEG score recompute
  10. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  11. 2026-09-21 09:50 UTCEG score recompute
  12. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  13. 2026-09-20 09:05 UTCEG score recompute
  14. 2026-09-19 06:54 UTCEG score recompute
  15. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  16. 2026-09-18 06:10 UTCEG score recompute
  17. 2026-09-17 05:26 UTCEG score recompute
  18. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  19. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  20. 2026-09-15 03:20 UTCEG score recompute
  21. 2026-09-14 02:36 UTCEG score recompute
  22. 2026-09-13 01:52 UTCEG score recompute
  23. 2026-09-12 01:07 UTCEG score recompute
  24. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  25. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  26. 2026-09-11 00:22 UTCEG score recompute
  27. 2026-09-09 02:15 UTCEG score recompute
  28. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  29. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  30. 2026-09-07 10:31 UTCEG score recompute
  31. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  32. 2026-09-06 09:46 UTCEG score recompute
  33. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  34. 2026-09-05 09:01 UTCEG score recompute
  35. 2026-09-04 08:16 UTCEG score recompute
  36. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  37. 2026-09-03 07:28 UTCEG score recompute
  38. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  39. 2026-09-02 06:43 UTCEG score recompute
  40. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  41. 2026-09-01 05:58 UTCEG score recompute
  42. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  43. 2026-08-31 05:10 UTCEG score recompute
  44. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  45. 2026-08-30 04:26 UTCEG score recompute
  46. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  47. 2026-08-29 03:41 UTCEG score recompute
  48. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  49. 2026-08-28 02:55 UTCEG score recompute
  50. 2026-08-27 02:10 UTCEG score recompute
  51. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  52. 2026-08-26 01:25 UTCEG score recompute
  53. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  54. 2026-08-25 00:40 UTCEG score recompute
  55. 2026-08-23 23:55 UTCEG score recompute
  56. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  57. 2026-08-22 23:11 UTCEG score recompute
  58. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  59. 2026-08-21 22:26 UTCEG score recompute
  60. 2026-08-21 22:00 UTCEG score recompute
  61. 2026-08-20 22:56 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  62. 2026-08-19 21:19 UTCEG score recompute
  63. 2026-08-19 20:53 UTCEG score recomputeFirst assessed: 5.3 MEDIUM
  64. 2026-08-19 20:52 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-68552?
CVE-2026-68552 is a medium-severity vulnerability; its CVE record was published on August 19, 2026. Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.15.0, an unauthenticated remote client can send a STUN message over TCP or TLS with a body-length field from 65520 through 65532, causing the uint16t len variable in stungetmessagelenstr() in src/client/nsturnmsg.c to…
When was the CVE record for CVE-2026-68552 published?
The CVE record for CVE-2026-68552 was published on August 19, 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-2026-68552 actively exploited?
CVE-2026-68552 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (42nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-68552?
CVE-2026-68552 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-68552?
A fix for CVE-2026-68552 is available: update to the fixed version the vendor names in its advisory.

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