CVE-2021-32715Medium· 5.3▾ SunlitLenient `hyper` header parsing of `Content-Length` could allow request smuggling
▾ Sunlit zone — Low / medium · no exploitation signal
impact 29.2 · likelihood 0.2 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 3.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
0.9%
0.9% → 1.1%
Last analysed / modified upstream
3.1 → 5.3
low → medium
hyper's HTTP header parser accepted, according to RFC 7230, illegal contents inside Content-Length headers.
Due to this, upstream HTTP proxies that ignore the header may still forward them along if it chooses to ignore the error.
To be vulnerable, hyper must be used as an HTTP/1 server and using an HTTP proxy upstream that ignores the header's contents
but still forwards it. Due to all the factors that must line up, an attack exploiting this vulnerability is unlikely.
hyper >= 0.0.0-0, < 0.14.10Upgrade to a patched release:
hyper 0.14.10Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.