CVE-2022-21221

Name: CVE-2022-21221
Creator: NVD / NIST
Published: 2022-03-17T12:15:08.087+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.46%

Last modified Jun 17, 2026

CVE-2022-21221 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The package github.com/valyala/fasthttp before 1.34.0 are vulnerable to Directory Traversal via the ServeFile function, due to improper sanitization. It is possible to be exploited by using a backslash %5c character in the path. EPSS estimates a 2.46% chance of exploitation in the next 30 days.

Description

The package github.com/valyala/fasthttp before 1.34.0 are vulnerable to Directory Traversal via the ServeFile function, due to improper sanitization. It is possible to be exploited by using a backslash %5c character in the path. **Note:** This security issue impacts Windows users only.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.46%

82.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Fasthttp Project	Fasthttp	< 1.34.0

References

https://github.com/valyala/fasthttp/commit/15262ecf3c602364639d465daba1e7f3604d00e8Patch, Third Party Advisory
https://github.com/valyala/fasthttp/commit/6b5bc7bb304975147b4af68df54ac214ed2554c1Patch, Third Party Advisory
https://github.com/valyala/fasthttp/issues/1226Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/valyala/fasthttp/releases/tag/v1.34.0Release Notes, Third Party Advisory
https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMVALYALAFASTHTTP-2407866Exploit, Patch, Third Party Advisory
https://github.com/valyala/fasthttp/commit/15262ecf3c602364639d465daba1e7f3604d00e8Patch, Third Party Advisory
https://github.com/valyala/fasthttp/commit/6b5bc7bb304975147b4af68df54ac214ed2554c1Patch, Third Party Advisory
https://github.com/valyala/fasthttp/issues/1226Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/valyala/fasthttp/releases/tag/v1.34.0Release Notes, Third Party Advisory
https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMVALYALAFASTHTTP-2407866Exploit, Patch, Third Party Advisory

Timeline

Published: Mar 17, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-21221?

How severe is CVE-2022-21221?

CVE-2022-21221 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.46% probability of exploitation in the next 30 days.

How do I fix CVE-2022-21221?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-21221?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST