DEBIAN-CVE-2023-34462

Advisory lineage Upstream: 1 Downstream: 1
Upstream
CVE-2023-34462
Downstream
DSA-5558-1
Published: 22 Jun 2023, 23:15
Last modified:28 Apr 2026, 20:26

Vulnerability Summary

Overall Risk (default)
medium
26/100
CVSS Score
6.5 MEDIUM
3.1 (osv_debian)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

22 Jun 2023, 23:15
Published
Vulnerability first disclosed
28 Apr 2026, 20:26
Last Modified
Vulnerability information updated

Description

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. The `SniHandler` can allocate up to 16MB of heap for each channel during the TLS handshake. When the handler or the channel does not have an idle timeout, it can be used to make a TCP server using the `SniHandler` to allocate 16MB of heap. The `SniHandler` class is a handler that waits for the TLS handshake to configure a `SslHandler` according to the indicated server name by the `ClientHello` record. For this matter it allocates a `ByteBuf` using the value defined in the `ClientHello` record. Normally the value of the packet should be smaller than the handshake packet but there are not checks done here and the way the code is written, it is possible to craft a packet that makes the `SslClientHelloHandler`. This vulnerability has been fixed in version 4.1.94.Final.

CVSS Metrics

  • v3.1•MEDIUM•Score: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Systems

  • debian•netty

    < 1:4.1.48-4+deb11u2 | < 1:4.1.48-7+deb12u1 | < 1:4.1.48-8 | < 1:4.1.48-8

References (1)