CVE-2025-61778

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 78% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.3
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.3Exploit: NoneExposed: 0

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

Akka.NET is a .NET port of the Akka project from the Scala / Java community. In all versions of Akka.Remote from v1.2.0 to v1.5.51, TLS could be enabled via our akka.remote.dot-netty.tcp transport and this would correctly enforce private key validation on the server-side of inbound connections. Akka.Remote, however, never asked the outbound-connecting client to present ITS certificate - therefore it's possible for untrusted parties to connect to a private key'd Akka.NET cluster and begin communicating with it without any certificate. The issue here is that for certificate-based authentication to work properly, ensuring that all members of the Akka.Remote network are secured with the same private key, Akka.Remote needed to implement mutual TLS. This was not the case before Akka.NET v1.5.52. Those who run Akka.NET inside a private network that they fully control or who were never using TLS in the first place are now affected by the bug. However, those who use TLS to secure their networks must upgrade to Akka.NET V1.5.52 or later. One patch forces "fail fast" semantics if TLS is enabled but the private key is missing or invalid. Previous versions would only check that once connection attempts occurred. The second patch, a critical fix, enforces mutual TLS (mTLS) by default, so both parties must be keyed using the same certificate. As a workaround, avoid exposing the application publicly to avoid the vulnerability having a practical impact on one's application. However, upgrading to version 1.5.52 is still recommended by the maintainers.

CVSS v3
9.3
EG Score
9.3(medium)
EPSS
29.6%
KEV
Not listed

Published

October 6, 2025

Last Modified

June 17, 2026

References (5)

Affected Packages

(2 across 1 ecosystem)
NuGet(2)
PackageVulnerable rangeFixed inDependents
Akka.Cluster1.2.0 ... 1.5.9 (153 versions)1.5.52—
Akka.Remote1.2.0 ... 1.5.9 (153 versions)1.5.52—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 46× 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. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-09 19:09 UTCEPSS rescore
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  24. 2026-06-26 03:16 UTCOSV refresh
  25. 2026-06-25 13:49 UTCEPSS rescore
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  1. 2026-06-24 14:04 UTCEPSS rescore
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  25. 2026-06-10 13:22 UTCEPSS rescore
  26. 2026-06-08 15:25 UTCEG score recompute▲ 9.30
  27. 2026-06-08 14:17 UTCEPSS rescore
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  29. 2026-06-07 15:24 UTCEPSS rescore
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  31. 2026-06-06 13:47 UTCEPSS rescore
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  39. 2026-06-02 20:13 UTCEPSS rescore
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  41. 2026-06-02 11:55 UTCOSV refresh
  42. 2026-06-01 13:51 UTCEPSS rescore
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  44. 2026-05-31 22:30 UTCEPSS rescore
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  65. 2026-05-21 22:43 UTCEPSS rescore
  66. 2026-05-21 06:52 UTCEG score recompute
  67. 2026-05-20 22:37 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2025-61778?
CVE-2025-61778 is a critical vulnerability published on October 6, 2025. Akka.NET is a .NET port of the Akka project from the Scala / Java community. In all versions of Akka.Remote from v1.2.0 to v1.5.51, TLS could be enabled via our akka.remote.dot-netty.tcp transport and this would correctly enforce private key validation on the server-side of inbound connections.…
When was CVE-2025-61778 disclosed?
CVE-2025-61778 was first published in the National Vulnerability Database on October 6, 2025, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-61778 actively exploited?
CVE-2025-61778 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-61778?
CVE-2025-61778 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2025-61778?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-61778, 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.

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