CVE-2025-15686

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreHIGH confidence

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, ghsa, secondary
Trending — 3 sources updated this weekElevated
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 4.3Exploit: Elevated riskExposed: 0

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

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
4.3(high)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity43% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
41%
KEV
Not listed

Published

August 12, 2026

Last Modified

August 12, 2026

Advisory Details (3)

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

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/
generic
https://github.com/user-attachments/files/23847497/HSS_ULR_error_poc.pcapng.zip
generic

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 22× in last 7d / 36× 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.

  1. 2026-08-21 02:34 UTCEG score recompute
  2. 2026-08-21 02:34 UTCGHSA enrichment
  3. 2026-08-20 22:54 UTCEPSS rescore
  4. 2026-08-20 01:53 UTCEG score recompute
  5. 2026-08-20 01:53 UTCGHSA enrichment
  6. 2026-08-19 17:02 UTCEPSS rescore
  7. 2026-08-19 01:12 UTCEG score recompute
  8. 2026-08-19 01:12 UTCGHSA enrichment
  9. 2026-08-18 13:47 UTCEPSS rescore
  10. 2026-08-18 00:31 UTCEG score recompute
  11. 2026-08-18 00:31 UTCGHSA enrichment
  12. 2026-08-17 13:46 UTCEPSS rescore
  13. 2026-08-16 23:46 UTCEG score recompute
  14. 2026-08-16 23:46 UTCGHSA enrichment
  15. 2026-08-16 14:55 UTCEPSS rescore
  16. 2026-08-16 02:13 UTCEPSS rescore
  17. 2026-08-16 02:13 UTCEPSS rescore
  18. 2026-08-15 23:05 UTCEG score recompute
  19. 2026-08-15 23:05 UTCGHSA enrichment
  20. 2026-08-15 01:29 UTCEPSS rescore
  21. 2026-08-14 22:23 UTCEG score recompute
  22. 2026-08-14 22:23 UTCGHSA enrichment
  23. 2026-08-13 21:59 UTCEPSS rescore
  24. 2026-08-13 21:42 UTCGHSA enrichment
  25. 2026-08-12 21:01 UTCGHSA enrichment
Show 11 more
  1. 2026-08-12 17:18 UTCEG score recompute
  2. 2026-08-12 17:17 UTCGHSA enrichment
  3. 2026-08-12 17:17 UTCNVD updateCVSS v4 → 2.1
  4. 2026-08-12 17:07 UTCEG score recompute
  5. 2026-08-12 17:07 UTCGHSA enrichment
  6. 2026-08-12 17:05 UTCMITRE cvelistV5CVSS v4 → 5.3
  7. 2026-08-12 13:49 UTCEPSS rescore
  8. 2026-08-12 03:25 UTCEG score recompute
  9. 2026-08-12 03:24 UTCNVD updateCVSS v4 → 2.1
  10. 2026-08-12 02:39 UTCEG score recompute
  11. 2026-08-12 02:39 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2025-15686?
CVE-2025-15686 is a medium vulnerability 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 CVE-2025-15686 disclosed?
CVE-2025-15686 was first published in the National Vulnerability Database on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-15686 actively exploited?
CVE-2025-15686 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 58.6% of all scored CVEs.
What is the CVSS score of CVE-2025-15686?
CVE-2025-15686 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2025-15686?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-15686, 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.

Dependency Blast Radius

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