CVE-2021-43797 Netty
| Affected software | Netty |
|---|---|
| Severity | 6.5 Medium CVSS 3.1 3 scores |
| Fixed in | 4.1.71.Final |
| Weakness | CWE-444 |
| Published | 9 Dec 2021 |
| Updated | 8 Oct 2026 |
Description
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.
Exploitation status
No public exploit
No exploit has been reported in the sources we check. Published 4 years ago.
Exploitation status
- CISA KEV not listed
- VulnCheck KEV not listed
- CISA Vulnrichment exploitation: none
- Indexed PoC none indexed
- EPSS 2.9% chance in 30 days
Waratek protection
A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.
- Protection none
- Action not pursued none
- Review human Researcher
- Record active
| Decided by | Manual classification of this CVE in the legacy dataset |
|---|---|
| Finding | A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product. |
CVSS
6.5 MEDIUM
v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
3 metrics
CVSS
6.5 MEDIUM v3.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
3 metrics
We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.
| Version | Score | Band | Vector | Assigner | Type | |
|---|---|---|---|---|---|---|
| CVSS 3.1 | 6.5 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |
security-advisories@github.com | Secondary | published |
| CVSS 3.1 | 6.5 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |
NVD | Primary | |
| CVSS 2.0 | 4.3 | none | AV:N/AC:M/Au:N/C:N/I:P/A:N |
NVD | Primary |
Affected software and releases
Oracle advisories
| Advisory | Type | Quarter | Products Oracle names in its risk matrix |
|---|---|---|---|
| Oracle Critical Patch Update January 2023 ↗ | CPU | 2023-Q1 | Oracle Communications Applications / Security (Netty) (12.0.0.3.0-12.0.0.7.0) Oracle Utilities Applications / System Wide (Netty) (2.5.0.1, 2.5.0.2) |
| Oracle Critical Patch Update July 2022 ↗ | CPU | 2022-Q3 | Oracle Communications Applications / PSR Designer (Netty) (7.4.2) Oracle Financial Services Applications / SECURITY (Netty) (2.6.2) Oracle Financial Services Applications / Web UI (Netty) (2.7) Oracle Financial Services Applications / Web UI (Netty) (2.7) |
| Oracle Critical Patch Update April 2022 ↗ | CPU | 2022-Q2 | Oracle Communications / NSSF (Netty) (1.8.0) Oracle Communications / Policy (Netty) (1.11.0) Oracle Communications / Policy (Netty) (1.15.0) Oracle Communications / SEPP (Netty) (1.7.0) Oracle Communications / UDR (Netty) (1.15.0) Oracle Communications Applications / ISC (Netty) (8.1) Oracle Fusion Middleware / Configuration and Parsing (Netty) (12.2.1.4.0, 14.1.1.0.0) Oracle Fusion Middleware / Reactive WebServer (Netty) (1.4.10,2.4.0) Oracle PeopleSoft / Elastic Search (Netty) (8.58, 8.59) |
Oracle components and versions
| Family | Component | Versions, as Oracle lists them | Read as |
|---|---|---|---|
| Oracle Communications | NSSF (Netty) | 1.8.0 | 1.8.0 |
| Oracle Communications | Policy (Netty) | 1.11.0 | 1.11.0 · 1.15.0 |
| Oracle Communications | SEPP (Netty) | 1.7.0 | 1.7.0 |
| Oracle Communications | UDR (Netty) | 1.15.0 | 1.15.0 |
| Oracle Communications Applications | ISC (Netty) | 8.1 | 8.1 |
| Oracle Communications Applications | PSR Designer (Netty) | 7.4.2 | 7.4.2 |
| Oracle Communications Applications | Security (Netty) | 12.0.0.3.0-12.0.0.7.0 | |
| Oracle Financial Services Applications | SECURITY (Netty) | 2.6.2 | 2.6.2 |
| Oracle Financial Services Applications | Web UI (Netty) | 2.7 | 2.7 |
| Oracle Fusion Middleware | Configuration and Parsing (Netty) | 12.2.1.4.0, 14.1.1.0.0 | 12.2.1.4.0 · 14.1.1.0.0 |
| Oracle Fusion Middleware | Reactive WebServer (Netty) | 1.4.10,2.4.0 | 1.4.10 · 2.4.0 |
| Oracle PeopleSoft | Elastic Search (Netty) | 8.58, 8.59 | 8.58 · 8.59 |
| Oracle Utilities Applications | System Wide (Netty) | 2.5.0.1, 2.5.0.2 | 2.5.0.1 · 2.5.0.2 |
Maven packages
Affected and fixed versions, from OSV.dev| Package | Introduced | Fixed | Last affected |
|---|---|---|---|
io.netty:netty-codec-http |
4.0.0 | 4.1.71.Final |
unbounded |
org.jboss.netty:netty |
0 | none | unbounded |
io.netty:netty |
0 | none | unbounded |
Products and versions
21 products, 25 version entries| Source | Vendor | Product | Scheme | Affected versions |
|---|---|---|---|---|
| nvd | debian | debian linux | generic | 10.0 · 11.0 |
| osv | io.netty | netty | generic | any version |
| osv | io.netty | netty-codec-http | generic | ≥ 4.0.0 and ＜ 4.1.71 |
| nvd | netapp | oncommand workflow automation | generic | any version |
| nvd | netapp | snapcenter | generic | any version |
| nvd | netty | netty | generic | ＜ 4.1.71 |
| nvd | oracle | banking deposits and lines of credit servicing | generic | 2.7 |
| nvd | oracle | banking party management | generic | 2.7.0 |
| nvd | oracle | banking platform | generic | 2.6.2 |
| nvd | oracle | coherence | generic | 12.2.1.4.0 · 14.1.1.0.0 |
| nvd | oracle | communications cloud native core binding support function | generic | 1.11.0 |
| nvd | oracle | communications cloud native core network slice selection function | generic | 1.8.0 |
| nvd | oracle | communications cloud native core policy | generic | 1.15.0 |
| nvd | oracle | communications cloud native core security edge protection proxy | generic | 1.7.0 |
| nvd | oracle | communications cloud native core unified data repository | generic | 1.15.0 |
| nvd | oracle | communications design studio | generic | 7.4.2 |
| nvd | oracle | communications instant messaging server | generic | 8.1 |
| nvd | oracle | helidon | generic | 1.4.10 · 2.4.0 |
| nvd | oracle | peoplesoft enterprise peopletools | generic | 8.58 · 8.59 |
| osv | org.jboss.netty | netty | generic | any version |
| nvd | quarkus | quarkus | generic | ＜ 2.5.3 |
References
Timeline
Timeline
| Published | 2021-12-09 | By the CVE Program. |
|---|---|---|
| NVD record modified | 2026-10-08 | NVD's own last-modified date for this record. |