CVE-2025-24970Network attack vector

Remote service crash via incomplete TLS record

Published Feb 10, 2025 · Updated Apr 16, 2025

Denial of service in Netty 4.1.91.Final through 4.1.117.Final allows remote attackers to crash native TLS applications via crafted packets. SslUtils.getEncryptedPacketLength reads incomplete TLS or DTLS record headers without first ensuring that all required bytes are present, passing an invalid packet length to ReferenceCountedOpenSslEngine.unwrap. Exposure requires SslHandler to use Netty's native SSLEngine; triggering the flaw crashes the native application and interrupts its service.

CVSS severity7.5
High
EPSS probability2.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Netty 4.1.91.Final through 4.1.117.Final allows remote attackers to crash native TLS applications via crafted packets. SslUtils.getEncryptedPacketLength reads incomplete TLS or DTLS record headers without first ensuring that all required bytes are present, passing an invalid packet length to ReferenceCountedOpenSslEngine.unwrap. Exposure requires SslHandler to use Netty's native SSLEngine; triggering the flaw crashes the native application and interrupts its service.

The record

CVE
CVE-2025-24970
Published
Feb 10, 2025
Updated
Apr 16, 2025
Vendor
The Netty Project
Product
Netty
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 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=>= 4.1.91.Final, <= 4.1.117.Final

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Netty Project · Nettyversion=>= 4.1.91.Final, <= 4.1.117.Final

Published CVSS scores

7.5GitHubCVSS: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.

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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

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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