CVE-2025-25199Network attack vector

Service interruption via unreleased TLS key handles

Published Feb 12, 2025 · Updated Feb 12, 2025

Resource leak in Microsoft go-crypto-winnative before 0.0.0-20250211154640-f49c8e1379ea allows remote attackers to exhaust memory. The cng.TLS1PRF function calls BCryptGenerateSymmetricKey but never releases the returned key handle with BCryptDestroyKey. Repeated unauthenticated TLS 1.2 handshakes against a Windows application built with GOEXPERIMENT=systemcrypto accumulate leaked handles until memory exhaustion interrupts the service.

CVSS severity7.5
High
EPSS probability1.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in Microsoft go-crypto-winnative before 0.0.0-20250211154640-f49c8e1379ea allows remote attackers to exhaust memory. The cng.TLS1PRF function calls BCryptGenerateSymmetricKey but never releases the returned key handle with BCryptDestroyKey. Repeated unauthenticated TLS 1.2 handshakes against a Windows application built with GOEXPERIMENT=systemcrypto accumulate leaked handles until memory exhaustion interrupts the service.

The record

CVE
CVE-2025-25199
Published
Feb 12, 2025
Updated
Feb 12, 2025
Vendor
Microsoft
Product
go-crypto-winnative
Classifications
CWE-401, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 12, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.0.0-20250211154640-f49c8e1379ea
  2. Affected versionversion=< 1.22.12-2
  3. Affected versionversion=< 1.23.6-2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · go-crypto-winnativeversion=< 0.0.0-20250211154640-f49c8e1379ea; version=< 1.22.12-2; version=< 1.23.6-2

Published CVSS scores

7.5GitHub CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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