🛡️ GHSA-xpw8-rcwv-8f8p — netty-codec-http2 (CVE-2023-44487)

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-400 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

io.netty:netty-codec-http2 vulnerable to HTTP/2 Rapid Reset Attack

A client might overload the server by issue frequent RST frames. This can cause a massive amount of load on the remote system and so cause a DDOS attack.

Impact

This is a DDOS attack, any http2 server is affected and so you should update as soon as possible.

Patches

This is patched in version 4.1.100.Final.

Workarounds

A user can limit the amount of RST frames that are accepted per connection over a timeframe manually using either an own Http2FrameListener implementation or an ChannelInboundHandler implementation (depending which http2 API is used).

References

  • https://www.cve.org/CVERecord?id=CVE-2023-44487
  • https://blog.cloudflare.com/technical-breakdown-http2-rapid-reset-ddos-attack/
  • https://cloud.google.com/blog/products/identity-security/google-cloud-mitigated-largest-ddos-attack-peaking-above-398-million-rps/

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

GHSA-xpw8-rcwv-8f8p is classified as CWE-400: Uncontrolled Resource Consumption. A request can consume memory, CPU or storage without limit, exhausting capacity for everyone else.

Affected software

GHSA-xpw8-rcwv-8f8p is recorded against 1 package.

  • io.netty:netty-codec-http2 (fixed in 4.1.100.Final)

Timeline and source

Published on 10 October 2023 and last revised on 4 February 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Package)
www.cve.org (Web)

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-400
Public Exploit ✅ No
Source OSV
Published 2023-10-10
Updated 2026-08-12
Modified 2026-02-04
Fix URL N/A

Affected Packages

Software From version Fixed in
io.netty:netty-codec-http2 — 4.1.100.Final

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