CVE catalog
CVE-2023-34462
netty: CVE-2023-34462
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 2.46% · Oct 27, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | netty | sid | 1:4.1.48-16 | fixed |
| Debian | netty | forky | 1:4.1.48-16 | fixed |
| Debian | netty | trixie | 1:4.1.48-10+deb13u1 | fixed |
| Debian | netty | trixie-security | 1:4.1.48-10+deb13u1 | fixed |
| Debian | netty | bookworm | 1:4.1.48-7+deb12u2 | fixed |
| Debian | netty | bookworm-security | 1:4.1.48-7+deb12u2 | fixed |
| Ubuntu | netty | 22.04 | 1:4.1.48-4 | vulnerable |
| Ubuntu | netty | 22.04 | 1:4.1.48-4+deb11u1build0.22.04.1 | vulnerable |
| Ubuntu | netty | 22.04 | 1:4.1.48-4+deb11u2build0.22.04.1 | fixed |
| Suse | netty-tcnative | linux enterprise module for development tools 15 sp4 | 2.0.61-150200.3.13.1 | fixed |
| Suse | netty-tcnative | linux enterprise module for development tools 15 sp5 | 2.0.61-150200.3.13.1 | fixed |
| Suse | netty | linux enterprise module for package hub 15 sp5 | 4.1.94-150200.4.17.1 | fixed |
| Suse | netty-tcnative | linux enterprise real time 15 sp3 | 2.0.61-150200.3.13.1 | fixed |
| Opensuse | netty | leap 15.4 | 4.1.94-150200.4.17.1 | fixed |
| Opensuse | netty-tcnative | leap 15.4 | 2.0.61-150200.3.13.1 | fixed |
| Opensuse | netty | leap 15.5 | 4.1.94-150200.4.17.1 | fixed |
| Opensuse | netty-tcnative | leap 15.5 | 2.0.61-150200.3.13.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | netty | source | sid | 1:4.1.48-8 | not yet assigned | Not reported | [1038947] |
| Debian | netty | source | forky | 1:4.1.48-8 | not yet assigned | Not reported | [1038947] |
| Debian | netty | source | trixie | 1:4.1.48-8 | not yet assigned | Not reported | [1038947] |
| Debian | netty | source | bookworm | 1:4.1.48-7+deb12u1 | not yet assigned | Not reported | [1038947] |
| Ubuntu | netty | deb | 22.04 | 1:4.1.48-4+deb11u2build0.22.04.1 | Not reported | USN-6994-1 | Not reported |
| Suse | netty-tcnative | rpm | linux enterprise module for development tools 15 sp4 | 2.0.61-150200.3.13.1 | Not reported | SUSE-SU-2023:2974-1 | Not reported |
| Suse | netty-tcnative | rpm | linux enterprise module for development tools 15 sp5 | 2.0.61-150200.3.13.1 | Not reported | SUSE-SU-2023:2974-1 | Not reported |
| Suse | netty | rpm | linux enterprise module for package hub 15 sp5 | 4.1.94-150200.4.17.1 | Not reported | SUSE-SU-2023:2974-1 | Not reported |
| Suse | netty-tcnative | rpm | linux enterprise real time 15 sp3 | 2.0.61-150200.3.13.1 | Not reported | SUSE-SU-2023:2974-1 | Not reported |
| Opensuse | netty | rpm | leap 15.4 | 4.1.94-150200.4.17.1 | Not reported | SUSE-SU-2023:2974-1 | Not reported |
| Opensuse | netty-tcnative | rpm | leap 15.4 | 2.0.61-150200.3.13.1 | Not reported | SUSE-SU-2023:2974-1 | Not reported |
| Opensuse | netty | rpm | leap 15.5 | 4.1.94-150200.4.17.1 | Not reported | SUSE-SU-2023:2974-1 | Not reported |
| Opensuse | netty-tcnative | rpm | leap 15.5 | 2.0.61-150200.3.13.1 | Not reported | SUSE-SU-2023:2974-1 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libnetty-java]Fixed
Source package: [netty]
Details (4)
1:4.1.48-7+deb12u2· all · bookwormFixed · Fixed:
1:4.1.48-7+deb12u1dsa · netty · debian · bookworm; dsa · netty · debian · 12
1:4.1.48-7+deb12u2· all · bookwormFixed · Fixed:
1:4.1.48-7+deb12u1dsa · netty · debian · bookworm; dsa · netty · debian · 12
1:4.1.48-7+deb12u2· all · bookworm-securityFixed · Fixed:
1:4.1.48-7+deb12u1dsa · netty · debian · bookworm; dsa · netty · debian · 12
1:4.1.48-7+deb12u2· all · bookworm-securityFixed · Fixed:
1:4.1.48-7+deb12u1dsa · netty · debian · bookworm; dsa · netty · debian · 12
[Debian 13 (Trixie)]
- [libnetty-java]Fixed
Source package: [netty]
Details (4)
1:4.1.48-10+deb13u1· all · trixieFixed · Fixed:
1:4.1.48-8dsa · netty · debian · 13
1:4.1.48-10+deb13u1· all · trixieFixed · Fixed:
1:4.1.48-8dsa · netty · debian · 13
1:4.1.48-10+deb13u1· all · trixie-securityFixed · Fixed:
1:4.1.48-8dsa · netty · debian · 13
1:4.1.48-10+deb13u1· all · trixie-securityFixed · Fixed:
1:4.1.48-8dsa · netty · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2023_2974-1.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2023-34462]
- [https://osv.dev/vulnerability/DSA-5558-1]
- [https://osv.dev/vulnerability/SUSE-SU-2023:2974-1]
- [https://osv.dev/vulnerability/USN-6994-1]
- [https://security-tracker.debian.org/tracker/CVE-2023-34462]
- [https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-34462.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2024/wid-sec-w-2024-0794.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]