CVE-2020-36565: Due to improper sanitization of user input on Windows, the static file handler allows for directory traversal,

Q: How do I fix CVE-2020-36565?

echo: upgrade to 4.2.0. Exact commands for each OS are on this page.

Q: Is CVE-2020-36565 being exploited?

CVE-2020-36565 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-36565 affect?

CVE-2020-36565 affects echo. Severity is medium (CVSS 5.3). Due to improper sanitization of user input on Windows, the static file handler allows for directory traversal, allowing an attacker to read files outside of the target directory that the server has permission to read.

Q: How urgent is CVE-2020-36565?

Priority 47/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.3REMOTEUPGRADE

CVE-2020-36565 is a medium-severity flaw (CVSS 5.3) affecting echo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Due to improper sanitization of user input on Windows, the static file handler allows for directory traversal, allowing an attacker to read files outside of the target directory that the server has permission to read.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 27%)
CISA exploited list	No
Weakness	CWE-22
Published	2022-12-07
Last modified	2026-06-17

Publisher (CNA): Go Project · Vendor: labstack

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-12-07 17:15 UTCPublished CVE record published
2026-06-17 03:15 UTCUpdated Record last modified

labstack echo UPGRADE

Affected: < 4.2.0

Fixed in: 4.2.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy echo || rpm -q echo || echo --version

2. UPGRADE to 4.2.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade echo

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade echo

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-36565?

echo: upgrade to 4.2.0. Exact commands for each OS are on this page.

Is CVE-2020-36565 being exploited?

CVE-2020-36565 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-36565 affect?

CVE-2020-36565 affects echo. Severity is medium (CVSS 5.3). Due to improper sanitization of user input on Windows, the static file handler allows for directory traversal, allowing an attacker to read files outside of the target directory that the server has permission to read.

How urgent is CVE-2020-36565?

Priority 47/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Windows vulnerabilities

Related CVEs

CVE-2025-51741 HIGH 7.5 DOWNGRADE An issue was discovered in Veal98 Echo Open-Source Community System 2.2 thru 2.3 allowing an unauthenticated a
CVE-2022-40083 CRITICAL 9.6 DOWNGRADE Labstack Echo v4.8.0 was discovered to contain an open redirect vulnerability via the Static Handler component

References

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