Netty vulnerabilities1 known to be exploited.
Netty has 29 published vulnerabilities across 2 products in our catalogue. 1 of them is on the list of flaws known to be exploited, so criminals are using them now. The most affected product is Netty, with 27. If you run Netty software, patch the exploited flaws first.
The most recent Netty flaw added to the known-exploited list is CVE-2023-44487, on 10 October 2023. We keep watching the known-exploited list.
Which Netty products have the most vulnerabilities?
Netty leads with 27 published vulnerabilities. Open a product to see its versions and which of its flaws criminals are already using.
Which Netty vulnerabilities are being exploited?
1 flaw is on the government list of vulnerabilities known to be exploited. These are the ones criminals are using now, so they go first, whatever their severity score says.
- 7.5HTTP/2 Rapid Reset Attack Vulnerability
HTTP/2 contains a rapid reset vulnerability that allows for a distributed denial-of-service attack (DDoS).
Which Netty flaws are most likely to be used?
Ranked by the latest exploit-likelihood forecast: the chance each flaw is used in an attack in the next 30 days. A high severity score on its own doesn't tell you that. Flaws shared by many other makers' products are left out.
- >99%
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
- 19%CVE-2021-21295Medium
Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients.
- 13%CVE-2019-20445Critical
HttpObjectDecoder.java in Netty before 4.1.44 allows a Content-Length header to be accompanied by a second Content-Length header, or by a Transfer-Encoding header.
- 11%CVE-2016-4970High
handler/ssl/OpenSslEngine.java in Netty 4.0.x before 4.0.37.Final and 4.1.x before 4.1.1.Final allows remote attackers to cause a denial of service (infinite loop).
- 9.2%CVE-2020-11612High
The ZlibDecoders in Netty 4.1.x before 4.1.46 allow for unbounded memory allocation while decoding a ZlibEncoded byte stream.
- 8.9%CVE-2019-20444Critical
HttpObjectDecoder.java in Netty before 4.1.44 allows an HTTP header that lacks a colon, which might be interpreted as a separate header with an incorrect syntax, or might be interpreted as an "invalid fold."
- 8.4%CVE-2019-16869High
Netty before 4.1.42.Final mishandles whitespace before the colon in HTTP headers (such as a "Transfer-Encoding : chunked" line), which leads to HTTP request smuggling.
- 6.6%CVE-2021-37137High
The Snappy frame decoder function doesn't restrict the chunk length which may lead to excessive memory usage.
- 5.9%CVE-2021-37136High
The Bzip2 decompression decoder function doesn't allow setting size restrictions on the decompressed output data (which affects the allocation size used during decompression).
- 5.2%CVE-2015-2156High
Netty before 3.9.8.Final, 3.10.x before 3.10.3.Final, 4.0.x before 4.0.28.Final, and 4.1.x before 4.1.0.Beta5 and Play Framework 2.x before 2.3.9 might allow remote attackers to bypass the httpOnly flag on cookies...
All Netty products we track.
2 products, most vulnerabilities first. Find the ones you run, then open a product to see its versions and exploited flaws.
Running Netty? We'll keep checking.
Looking flaws up one at a time doesn't scale. Tell us what you run once, and we tell you which flaws matter to you, in what order, and keep watching for new ones.
- Tell us what you runPick your software from a list, or let us work it out from your website.
- We match it to every flawOver 400,000 published flaws, checked against your list.
- Ranked by real-world riskA 0 to 100 score, led by evidence criminals are using it.
- Told as soon as we knowAn alert by email, in the app or by webhook to your own tools.
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1 flaw being exploited affects software Acme tracks
HTTP/2 contains a rapid reset vulnerability that allows for a distributed denial-of-service attack (DDoS).
- Matched to
- Netty on Acme's software list
- What to do
- Patch first, then check for signs of use
Sent to the alert recipients Acme chose. Also in the app and to Acme's webhook.
Our catalogue lists 29 published vulnerabilities across 2 products and 278 versions from Netty. The most recent Netty flaw added to the known-exploited list is CVE-2023-44487, on 10 October 2023.
1 Netty vulnerability is on the list of flaws known to be exploited. The most recently added is CVE-2023-44487. The full list is on this page.
Netty, with 27 published vulnerabilities. Its own page lists the ones known to be exploited.
Create a Precursor Intelligence account and track the Netty products you run. We match them against every published flaw, give each one a risk score from 0 to 100 and tell you as soon as we spot one that affects you, by email, in the app or by webhook.