CVE catalog
CVE-2021-43797
Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. Netty prior to version 4.1.71.Final skips control
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 2.88% · Oct 25, 2026
Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. Netty prior to version 4.1.71.Final skips control chars when they are present at the beginning / end of the header name. It should instead fail fast as these are not allowed by the spec and could lead to HTTP request smuggling. Failing to do the validation might cause netty to "sanitize" header names before it forward these to another remote system when used as proxy. This remote system can't see the invalid usage anymore, and therefore does not do the validation itself. Users should upgrade to version 4.1.71.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 |
| Cpe | netty | Not reported | 4.1.71 | fixed |
| Cpe | quarkus | Not reported | 2.5.3 | fixed |
| Cpe | oncommand_workflow_automation | Not reported | Not reported | unknown |
| Cpe | snapcenter | Not reported | Not reported | unknown |
| Cpe | banking_deposits_and_lines_of_credit_servicing | Not reported | Not reported | unknown |
| Cpe | banking_party_management | Not reported | Not reported | unknown |
| Cpe | banking_platform | Not reported | Not reported | unknown |
| Cpe | coherence | Not reported | Not reported | unknown |
| Cpe | coherence | Not reported | Not reported | unknown |
| Cpe | communications_cloud_native_core_binding_support_function | Not reported | Not reported | unknown |
| Cpe | communications_cloud_native_core_network_slice_selection_function | Not reported | Not reported | unknown |
| Cpe | communications_cloud_native_core_policy | Not reported | Not reported | unknown |
| Cpe | communications_cloud_native_core_security_edge_protection_proxy | Not reported | Not reported | unknown |
| Cpe | communications_cloud_native_core_unified_data_repository | Not reported | Not reported | unknown |
| Cpe | communications_design_studio | Not reported | Not reported | unknown |
| Cpe | communications_instant_messaging_server | Not reported | Not reported | unknown |
| Cpe | helidon | Not reported | Not reported | unknown |
| Cpe | helidon | Not reported | Not reported | unknown |
| Cpe | peoplesoft_enterprise_peopletools | Not reported | Not reported | unknown |
| Cpe | peoplesoft_enterprise_peopletools | Not reported | Not reported | unknown |
| Ubuntu | netty | pro | 1:4.1.33-1 | vulnerable |
| Ubuntu | netty | pro | 1:4.1.33-2 | vulnerable |
| Ubuntu | netty | pro | 1:4.1.33-3 | vulnerable |
| Ubuntu | netty | pro | 1:4.1.45-1 | vulnerable |
| Ubuntu | netty | pro | 1:4.1.45-1ubuntu0.1~esm1 | fixed |
| Ubuntu | netty | 22.04 | 1:4.1.48-4 | vulnerable |
| Ubuntu | netty | 22.04 | 1:4.1.48-4+deb11u1build0.22.04.1 | fixed |
| Suse | netty3 | linux enterprise module for development tools 15 sp3 | 3.10.6-150200.3.3.2 | fixed |
| Suse | netty3 | linux enterprise module for development tools 15 sp4 | 3.10.6-150200.3.3.2 | fixed |
| Opensuse | netty3 | leap 15.3 | 3.10.6-150200.3.3.2 | fixed |
| Opensuse | netty3 | leap 15.4 | 3.10.6-150200.3.3.2 | fixed |
| Opensuse | netty | tumbleweed | 4.1.72-1.1 | fixed |
| Opensuse | netty3 | tumbleweed | 3.10.6-9.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | netty | source | sid | 1:4.1.48-6 | not yet assigned | Not reported | [1001437] |
| Debian | netty | source | forky | 1:4.1.48-6 | not yet assigned | Not reported | [1001437] |
| Debian | netty | source | trixie | 1:4.1.48-6 | not yet assigned | Not reported | [1001437] |
| Debian | netty | source | bookworm | 1:4.1.48-6 | not yet assigned | Not reported | [1001437] |
| Cpe | netty | cpe | Not reported | 4.1.71 | Not reported | NVD-CVE-2021-43797 | Not reported |
| Cpe | quarkus | cpe | Not reported | 2.5.3 | Not reported | NVD-CVE-2021-43797 | Not reported |
| Ubuntu | netty | deb | pro | 1:4.1.45-1ubuntu0.1~esm1 | Not reported | UBUNTU-CVE-2021-43797 | Not reported |
| Ubuntu | netty | deb | 22.04 | 1:4.1.48-4+deb11u1build0.22.04.1 | Not reported | UBUNTU-CVE-2021-43797 | Not reported |
| Suse | netty3 | rpm | linux enterprise module for development tools 15 sp3 | 3.10.6-150200.3.3.2 | Not reported | SUSE-SU-2022:2047-1 | Not reported |
| Suse | netty3 | rpm | linux enterprise module for development tools 15 sp4 | 3.10.6-150200.3.3.2 | Not reported | SUSE-SU-2022:2047-1 | Not reported |
| Opensuse | netty3 | rpm | leap 15.3 | 3.10.6-150200.3.3.2 | Not reported | SUSE-SU-2022:2047-1 | Not reported |
| Opensuse | netty3 | rpm | leap 15.4 | 3.10.6-150200.3.3.2 | Not reported | SUSE-SU-2022:2047-1 | Not reported |
| Opensuse | netty | rpm | tumbleweed | 4.1.72-1.1 | Not reported | OPENSUSE-SU-2024:11743-1 | Not reported |
| Opensuse | netty3 | rpm | tumbleweed | 3.10.6-9.1 | Not reported | OPENSUSE-SU-2024:11981-1 | Not reported |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
[Debian 12 (Bookworm)]
- [libnetty-java]Unknown
Source package: [netty]
Details (4)
1:4.1.48-7+deb12u2· all · bookwormFixed · Fixed:
1:4.1.48-6nvd · netty · debian · bookworm; nvd · netty · debian · 12
1:4.1.48-7+deb12u2· all · bookwormFixed · Fixed:
1:4.1.48-6nvd · netty · debian · bookworm; nvd · netty · debian · 12
1:4.1.48-7+deb12u2· all · bookworm-securityFixed · Fixed:
1:4.1.48-6nvd · netty · debian · bookworm; nvd · netty · debian · 12
1:4.1.48-7+deb12u2· all · bookworm-securityFixed · Fixed:
1:4.1.48-6nvd · netty · debian · bookworm; nvd · netty · debian · 12
[Debian 13 (Trixie)]
- [libnetty-java]Unknown
Source package: [netty]
Details (4)
1:4.1.48-10+deb13u1· all · trixieFixed · Fixed:
1:4.1.48-6nvd · netty · debian · 13
1:4.1.48-10+deb13u1· all · trixieFixed · Fixed:
1:4.1.48-6nvd · netty · debian · 13
1:4.1.48-10+deb13u1· all · trixie-securityFixed · Fixed:
1:4.1.48-6nvd · netty · debian · 13
1:4.1.48-10+deb13u1· all · trixie-securityFixed · Fixed:
1:4.1.48-6nvd · netty · debian · 13
[openSUSE Tumbleweed]
- [netty]Unknown
Source package: [netty]
Details (1)
4.1.136-1.1· x86_64 · tumbleweedFixed · Fixed:
4.1.72-1.1nvd · netty · opensuse · tumbleweed
- [netty-bom]Unknown
Source package: [netty]
Details (1)
4.1.136-1.1· noarch · tumbleweedUnknown · Fixed:
4.1.72-1.1Version impact unknown
nvd · netty · opensuse · tumbleweed
- [netty-javadoc]Unknown
Source package: [netty]
Details (1)
4.1.136-1.1· noarch · tumbleweedUnknown · Fixed:
4.1.72-1.1Version impact unknown
nvd · netty · opensuse · tumbleweed
- [netty-parent]Unknown
Source package: [netty]
Details (1)
4.1.136-1.1· noarch · tumbleweedUnknown · Fixed:
4.1.72-1.1Version impact unknown
nvd · netty · opensuse · tumbleweed
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2022_1271-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2021-43797]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2021-43797]
- [https://osv.dev/vulnerability/SUSE-SU-2022:2047-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2021-43797]
- [https://osv.dev/vulnerability/openSUSE-SU-2024:11743-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2024:11981-1]
- [https://security-tracker.debian.org/tracker/CVE-2021-43797]
- [https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-43797.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2022/wid-sec-w-2022-0607.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]