Missing Authorization Affecting std/net/http/httputil package, versions <1.15.13>=1.16.0-0 <1.16.5
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published6 Jan 2026
- disclosed17 Feb 2022
- creditMattias Grenfeldt, Asta Olofsson
Introduced: 17 Feb 2022
CVE-2021-33197 (opens in a new tab)How to fix?
Upgrade std/net/http/httputil to version 1.15.13, 1.16.5 or higher.
Overview
std/net/http/httputil is a Go standard library package std/net/http/httputil
Affected versions of this package are vulnerable to Missing Authorization.
Go Vulnerability Report:
ReverseProxy can be made to forward certain hop-by-hop headers, including Connection. If the target of the ReverseProxy is itself a reverse proxy, this lets an attacker drop arbitrary headers, including those set by the ReverseProxy.Director.