CVE-2021-32714 Integer Overflow in Chunked Transfer-Encoding

What is CVE-2021-32714?

CVE-2021-32714 is a medium-severity vulnerability in hyperium hyper, published on 7 Jul 2021.

Official description

hyper is an HTTP library for Rust. In versions prior to 0.14.10, hyper's HTTP server and client code had a flaw that could trigger an integer overflow when decoding chunk sizes that are too big. This allows possible data loss, or if combined with an upstream HTTP proxy that allows chunk sizes larger than hyper does, can result in "request smuggling" or "desync attacks." The vulnerability is patched in version 0.14.10. Two possible workarounds exist. One may reject requests manually that contain a `Transfer-Encoding` header or ensure any upstream proxy rejects `Transfer-Encoding` chunk sizes greater than what fits in 64-bit unsigned integers.

Weakness: CWE-190

Which versions are affected by CVE-2021-32714?

3 open source packages ship an affected version, including hyper. It affects 1 product.

Products include Hyper Hyper.

How do I fix CVE-2021-32714?

Upgrade hyper to 0.14.10 or later.

Is CVE-2021-32714 being exploited?

There is no known exploitation of CVE-2021-32714 in the wild and no public exploit code.

Other vulnerabilities in hyperium hyper

• CVE-2020-35863 HTTP Request Smuggling in hyper Critical 9.8
• CVE-2022-31394 Denial of service in n/a High 7.5
• CVE-2017-18587 Headers containing newline characters can split messages in hyper Medium 5.3
• CVE-2021-21299 Multiple Transfer-Encoding headers misinterprets request payload Medium 4.8
• CVE-2016-10932 HTTPS MitM vulnerability due to lack of hostname verification Medium 4.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2021-32714, GHSA-5h46-h7hh-c6x9, RUSTSEC-2021-0079, UBUNTU-CVE-2021-32714.