CVE-2019-25219Network attack vector

False TLS success via zero-valued error propagation

Published Oct 29, 2024 · Updated Oct 30, 2024

Improper SSL error handling in Asio before 1.13.0 allows remote attackers to have failed TLS operations reported as successful. The SSL engine constructs an error_code from a zero-valued system error after SSL_ERROR_SYSCALL, clearing the error instead of recording the failed operation. The condition requires an application built with the affected headers to use Asio SSL support, and downstream impact depends on the caller's handling of false success.

CVSS severity7.5
High
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper SSL error handling in Asio before 1.13.0 allows remote attackers to have failed TLS operations reported as successful. The SSL engine constructs an error_code from a zero-valued system error after SSL_ERROR_SYSCALL, clearing the error instead of recording the failed operation. The condition requires an application built with the affected headers to use Asio SSL support, and downstream impact depends on the caller's handling of false success.

The record

CVE
CVE-2019-25219
Published
Oct 29, 2024
Updated
Oct 30, 2024
Vendor
Asio
Product
Asio
Classifications
CWE-1188
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 30, 2024Record 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 <1.13.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Asio · Asioversion=0 <1.13.0

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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.

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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-1188Initialization of a Resource with an Insecure Default

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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