CVE-2022-40083: Labstack Echo v4.8.0 was discovered to contain an open redirect vulnerability via the Static Handler component

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CRITICAL 9.6DOWNGRADE

CVE-2022-40083 is a critical-severity flaw (CVSS 9.6) affecting echo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Labstack Echo v4.8.0 was discovered to contain an open redirect vulnerability via the Static Handler component. This vulnerability can be leveraged by attackers to cause a Server-Side Request Forgery (SSRF).

Why this priority

Critical severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	3.2% (top 12%)
CISA exploited list	No
Weakness	CWE-601
Published	2022-09-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: labstack

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

Am I affected?

Timeline

2022-09-28 14:15 UTCPublished CVE record published
2026-06-17 05:00 UTCUpdated Record last modified

labstack echo DOWNGRADE

Affected: 4.8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.8.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.8.0 (Debian / Ubuntu)

apt-cache madison echo sudo apt install echo=<VERSION_BEFORE_4.8.0> sudo apt-mark hold echo

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list echo sudo dnf downgrade echo-<VERSION_BEFORE_4.8.0> sudo dnf versionlock add echo

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: Labstack Echo 4.8.0 - Open Redirect

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-2022-40083?

echo: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-40083 being exploited?

CVE-2022-40083 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-2022-40083 affect?

CVE-2022-40083 affects echo. Severity is critical (CVSS 9.6). Labstack Echo v4.8.0 was discovered to contain an open redirect vulnerability via the Static Handler component. This vulnerability can be leveraged by attackers to cause a Server-Side Request Forgery (SSRF).

How urgent is CVE-2022-40083?

Priority 61/100. Critical severity; Public exploit reference

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-2020-36565 MEDIUM 5.3 UPGRADE Due to improper sanitization of user input on Windows, the static file handler allows for directory traversal,

References

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