CVE-2025-15686

MEDIUMPre-NVD 4.34.3
EchelonGraph scoreMEDIUM confidence

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

Score 4.3 from GitHub Security Advisory (severity: LOW) published 2026-08-12. A secondary CVSS source baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Elevated
4.3EG
EchelonGraph verdictPlan mitigationRemediate 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: 0.5%CVSS: 4.3Exploit: No code on recordExposed services: Not assessed

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

The CVE record's description, written by its CNA (VulDB), states the affected versions: "A vulnerability has been found in Open5GS up to 2.7.6." No release containing a fix is confirmed on record.

A vulnerability has been found in Open5GS up to 2.7.6. Affected by this issue is the function fd_msg_sess_get of the component HSS Service. Such manipulation of the argument Session-Id leads to denial of service. The attack may be performed from remote. The exploit has been disclosed to the public and may be used. The project locked and limited conversation to collaborators.

CVSS v3
4.3
EG Score
4.3MEDIUMmedium confidence
EG Risk
35
EG Risk 35/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity43% × 45%
Impact severity (EG Severity): CVSS 4.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
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: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
43rd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (4.3): severity, escalated by confirmed exploitation. This CVE's 4.3 is its impact severity (EG Severity), not escalated.

EG Severity
4.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-17). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

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

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

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 12, 2026

Last Modified

September 29, 2026

Advisory Details (3)

Auto-updated Aug 12, 2026
No fix on record yet.
Web page

GitHub - open5gs/open5gs: Open5GS is a C-language Open Source implementation for 5G Core and EPC, i.e. the core network of LTE/NR network (Release-19) · GitHub

https://github.com/open5gs/open5gs/
Web page
https://github.com/user-attachments/files/23847497/HSS_ULR_error_poc.pcapng.zip
Web page

HSS crash caused by Diameter protocol ULR message · Issue #4190 · open5gs/open5gs · GitHub

https://github.com/open5gs/open5gs/issues/4190

Vendor Advisories for CVE-2025-15686(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 8× in last 7d / 55× 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 98 of 170 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. 2 repeat rows among the latest 100 are merged into the row they repeat. The 72 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-19 16:30 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  2. 2026-10-18 16:30 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  3. 2026-10-18 05:48 UTCEG score recompute
  4. 2026-10-17 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  5. 2026-10-16 16:37 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  6. 2026-10-15 16:30 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  7. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  8. 2026-10-13 16:31 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  9. 2026-10-12 17:22 UTCEG score recompute
  10. 2026-10-12 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  11. 2026-10-11 20:53 UTCEG score recompute
  12. 2026-10-11 19:03 UTCEG score recompute
  13. 2026-10-11 15:43 UTCEG score recompute
  14. 2026-10-11 13:46 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  15. 2026-10-10 19:58 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  16. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  17. 2026-10-08 17:08 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  18. 2026-10-07 23:46 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  19. 2026-10-06 17:33 UTCEG score recompute
  20. 2026-10-06 17:33 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  21. 2026-10-06 15:16 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  22. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  23. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  24. 2026-10-04 22:33 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  25. 2026-10-03 20:25 UTCEG score recompute
Show 73 more
  1. 2026-10-03 20:25 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  2. 2026-10-03 14:24 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  3. 2026-10-02 08:24 UTCEG score recompute
  4. 2026-10-02 08:24 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  5. 2026-10-01 19:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  6. 2026-09-30 21:59 UTCEG score recompute
  7. 2026-09-30 21:59 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  8. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  9. 2026-09-29 11:12 UTCEG score recompute
  10. 2026-09-29 11:12 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  11. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  12. 2026-09-28 10:49 UTCEG score recompute
  13. 2026-09-28 10:49 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  14. 2026-09-27 09:58 UTCEG score recompute
  15. 2026-09-27 09:58 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  16. 2026-09-26 15:57 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  17. 2026-09-25 06:28 UTCEG score recompute
  18. 2026-09-25 06:28 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  19. 2026-09-24 14:02 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  20. 2026-09-24 05:47 UTCEG score recompute
  21. 2026-09-24 05:47 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  22. 2026-09-23 13:46 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  23. 2026-09-23 05:06 UTCEG score recompute
  24. 2026-09-23 05:06 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  25. 2026-09-22 14:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  26. 2026-09-22 04:24 UTCEG score recompute
  27. 2026-09-22 04:24 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  28. 2026-09-21 03:36 UTCEG score recompute
  29. 2026-09-21 03:36 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  30. 2026-09-20 20:14 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  31. 2026-09-20 02:54 UTCEG score recompute
  32. 2026-09-20 02:54 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  33. 2026-09-19 01:54 UTCEG score recompute
  34. 2026-09-19 01:54 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  35. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  36. 2026-09-18 01:04 UTCEG score recompute
  37. 2026-09-18 01:04 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  38. 2026-09-17 00:23 UTCEG score recompute
  39. 2026-09-17 00:23 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  40. 2026-09-16 14:06 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  41. 2026-09-16 05:13 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  42. 2026-09-15 13:16 UTCEG score recompute
  43. 2026-09-15 13:16 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  44. 2026-09-15 03:08 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  45. 2026-09-14 11:26 UTCEG score recompute
  46. 2026-09-14 11:26 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  47. 2026-09-13 16:45 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  48. 2026-09-13 10:45 UTCEG score recompute
  49. 2026-09-13 10:45 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  50. 2026-09-12 14:59 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  51. 2026-09-12 10:04 UTCEG score recompute
  52. 2026-09-12 10:04 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  53. 2026-09-11 14:51 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  54. 2026-09-11 09:35 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  55. 2026-09-11 09:22 UTCEG score recompute
  56. 2026-09-11 09:22 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  57. 2026-09-10 09:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  58. 2026-09-10 08:40 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  59. 2026-09-09 07:53 UTCEG score recompute
  60. 2026-09-09 07:52 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  61. 2026-09-08 21:59 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  62. 2026-09-08 07:11 UTCEG score recompute
  63. 2026-09-08 07:11 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  64. 2026-09-07 16:00 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  65. 2026-09-07 05:57 UTCEG score recompute
  66. 2026-09-07 05:57 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  67. 2026-09-06 13:46 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  68. 2026-09-06 03:02 UTCEG score recompute
  69. 2026-09-06 03:02 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  70. 2026-09-05 02:21 UTCEG score recompute
  71. 2026-09-05 02:21 UTCGHSA enrichmentGHSA-hwwm-2gq7-f4rr · GitHub severity LOW · GitHub CVSS 4.3
  72. 2026-09-04 13:59 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  73. 2026-09-04 05:05 UTCEPSS rescoreEPSS 0.3% · 22nd percentile

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Frequently asked(5)

What is CVE-2025-15686?
CVE-2025-15686 is a medium-severity vulnerability; its CVE record was published on August 12, 2026. A vulnerability has been found in Open5GS up to 2.7.6. Affected by this issue is the function fdmsgsess_get of the component HSS Service. Such manipulation of the argument Session-Id leads to denial of service. The attack may be performed from remote. The exploit has been disclosed to the public…
When was the CVE record for CVE-2025-15686 published?
The CVE record for CVE-2025-15686 was published on August 12, 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 29, 2026; the record at its source may have been updated since.
Is CVE-2025-15686 actively exploited?
CVE-2025-15686 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2025-15686?
CVE-2025-15686 has a CVSS base score of 4.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2025-15686?
No fix for CVE-2025-15686 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The CVE record's description, written by its CNA (VulDB), states the affected versions: "A vulnerability has been found in Open5GS up to 2.7.6." No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2025-15686 are linked in the Vendor Advisories panel on this page.

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