CVE-2021-33194 golang.org/x/net/html Infinite Loop vulnerability

What is CVE-2021-33194?

CVE-2021-33194 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 26 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

golang.org/x/net before v0.0.0-20210520170846-37e1c6afe023 allows attackers to cause a denial of service (infinite loop) via crafted ParseFragment input.

Weakness: CWE-835

Which versions are affected by CVE-2021-33194?

4 open source packages ship an affected version, including golang.org/x/net and golang. It affects 2 products.

Products include Fedoraproject Fedora, Golang Go.

How do I fix CVE-2021-33194?

Upgrade golang.org/x/net to 0.0.0-20210520170846-37e1c6afe023 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2021-33194 being exploited?

There is no known exploitation of CVE-2021-33194 in the wild and no public exploit code.

Other vulnerabilities in Fedoraproject Fedora

• CVE-2024-4577 PHP-CGI OS Command Injection Exploited Critical 9.8
• CVE-2021-39226 Grafana Authentication Bypass Exploited Critical 9.8
• CVE-2019-5544 VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Exploited Critical 9.8
• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

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

Also known as BIT-golang-2021-33194, CLEANSTART-2026-GW81743, CLEANSTART-2026-NF32762, DEBIAN-CVE-2021-33194, GHSA-83g2-8m93-v3w7, GO-2021-0238 and 1 more.