7.5High
Broadcom Reactor Netty
CVE-2020-5403
Reactor Netty HttpServer, versions 0.9.3 and 0.9.4, is exposed to a URISyntaxException that causes the connection to be closed prematurely instead of producing a 400 response.
What this means for your business
- It affects Broadcom Reactor Netty. It matters if your company, or a supplier that handles your data, runs it.
- An attacker can use it remotely, over a network, without a login, and without anyone at your company clicking anything.
- FIRST's prediction model gives it a 1% chance of attack attempts being seen in the next 30 days, ranking above 65% of all known flaws.
What to do
- 1Check whether your company or your suppliers run Broadcom Reactor Netty, and which version. The affected versions are listed further down this page.
- 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.
Not sure if your company is exposed?
Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.
Scoring
- CVSS
- 7.5 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness
- CWE-20
- Assigned by
- security@pivotal.io
Dates
- Published
- 2020-03-03
- Last modified
- 2026-09-04
- Sources
- NVD
Affected products
- Broadcom Reactor Netty0.9.3, 0.9.4
As listed in the NVD configuration data. Not a statement about your estate.