CVE-2021-36221

5.9 MEDIUM 3% exploit odds Fix listed

What it is

Go before 1.15.15 and 1.16.x before 1.16.7 has a race condition that can lead to a net/http/httputil ReverseProxy panic upon an ErrAbortHandler abort.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of service disruption.
Exploit odds: 3.1% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2021-08-08 06:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:58 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 3.1% in the next 30 days (EPSS).
Severity: 5.9 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2021-08-08 06:15 UTC
Last modified: 2026-06-17 03:58 UTC
Exploit probability: 3.1% · EPSS, next 30 days
Weakness: CWE-362 · Race condition
Record status: Modified

Affected

Golang Go < 1.15.15
Golang Go < 1.16.7
Fedoraproject Fedora 33
Fedoraproject Fedora 34
Fedoraproject Fedora 35
Debian Linux 9.0
Oracle Timesten in-memory Database < 21.1.1.1.0
Siemens Scalance lpe9403 Firmware < 2.0

Attack profile CVSS 3.1 · 5.9

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-36221.md and follow it. Check whether this project is affected by CVE-2021-36221. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record