CVE-2019-15604Public exploitNetwork attack vector

TLS server crash via unsupported certificate extension

Published Feb 7, 2020 · Updated Apr 30, 2025

TLS denial of service in Node.js 10, 12, and 13 allows remote attackers to crash servers via crafted client certificates. When peer-certificate details are read, X509ToObject passes an unsupported subjectAltName string type to X509V3_EXT_print and asserts when printing fails. Reachability requires a TLS endpoint that requests a client certificate and reads its peer details; the assertion aborts the entire Node.js process.

CVSS severity7.5
High
EPSS probability20.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

TLS denial of service in Node.js 10, 12, and 13 allows remote attackers to crash servers via crafted client certificates. When peer-certificate details are read, X509ToObject passes an unsupported subjectAltName string type to X509V3_EXT_print and asserts when printing fails. Reachability requires a TLS endpoint that requests a client certificate and reads its peer details; the assertion aborts the entire Node.js process.

The record

CVE
CVE-2019-15604
Published
Feb 7, 2020
Updated
Apr 30, 2025
Vendor
Node.js
Product
Node.js
Classifications
CWE-295, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 7, 2020CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 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=10.0 <10.19.0
  2. Affected versionversion=11.0 <11.*
  3. Affected versionversion=12.0 <12.15.0
  4. Affected versionversion=13.0 <13.8.0
  5. Affected versionversion=4.0 <4.*
  6. Affected versionversion=5.0 <5.*
  7. Affected versionversion=6.0 <6.*
  8. Affected versionversion=7.0 <7.*
  9. Affected versionversion=8.0 <8.*
  10. Affected versionversion=9.0 <9.*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Node.js · Node.jsversion=10.0 <10.19.0; version=11.0 <11.*; version=12.0 <12.15.0; version=13.0 <13.8.0; version=4.0 <4.*; version=5.0 <5.*; version=6.0 <6.*; version=7.0 <7.*; version=8.0 <8.*; version=9.0 <9.*

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P

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 exploitPublished

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

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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