CVE-2021-36386 Denial of service in n/a

What is CVE-2021-36386?

CVE-2021-36386 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 29 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

report_vbuild in report.c in Fetchmail before 6.4.20 sometimes omits initialization of the vsnprintf va_list argument, which might allow mail servers to cause a denial of service or possibly have unspecified other impact via long error messages. NOTE: it is unclear whether use of Fetchmail on any realistic platform results in an impact beyond an inconvenience to the client user.

Weakness: CWE-909

Which versions are affected by CVE-2021-36386?

It affects 2 products.

Products include Fedoraproject Fedora, Fetchmail Fetchmail.

How do I fix CVE-2021-36386?

Upgrade to a fixed version.

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-2021-36386 being exploited?

There is no known exploitation of CVE-2021-36386 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 AZL-7226, CLEANSTART-2024-YI47904, DEBIAN-CVE-2021-36386, GHSA-rr6c-95pp-cpgf, MGASA-2021-0391, OESA-2021-1314 and 6 more.