CVE-2021-43844: MSEdgeRedirect is a tool to redirect news, search, widgets, weather, and more to a user's default browser

Q: How do I fix CVE-2021-43844?

msedgeredirect: upgrade to 0.5.0.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-43844 being exploited?

CVE-2021-43844 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-2021-43844 affect?

CVE-2021-43844 affects msedgeredirect. Severity is high (CVSS 8.8). MSEdgeRedirect is a tool to redirect news, search, widgets, weather, and more to a user's default browser. MSEdgeRedirect versions before 0.5.0.1 are vulnerable to Remote Code Execution via specifically crafted URLs. This vulnerability requ

Q: How urgent is CVE-2021-43844?

Priority 58/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2021-43844 is a high-severity flaw (CVSS 8.8) affecting msedgeredirect. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MSEdgeRedirect is a tool to redirect news, search, widgets, weather, and more to a user's default browser. MSEdgeRedirect versions before 0.5.0.1 are vulnerable to Remote Code Execution via specifically crafted URLs. This vulnerability requires user interaction and the acceptance of a prompt. With how MSEdgeRedirect is coded, parameters are impossible to pass to any launched file. However, there are two possible scenarios in which an attacker can

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	3.4% (top 11%)
CISA exploited list	No
Weakness	CWE-610
Published	2021-12-20
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: msedgeredirect project

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

Am I affected?

Timeline

2021-12-20 22:15 UTCPublished CVE record published
2026-06-17 04:11 UTCUpdated Record last modified

msedgeredirect project msedgeredirect UPGRADE

Affected: < 0.5.0.1

Fixed in: 0.5.0.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.5.0.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade msedgeredirect

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-2021-43844?

msedgeredirect: upgrade to 0.5.0.1. Exact commands for each OS are on this page.

Is CVE-2021-43844 being exploited?

CVE-2021-43844 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-2021-43844 affect?

CVE-2021-43844 affects msedgeredirect. Severity is high (CVSS 8.8). MSEdgeRedirect is a tool to redirect news, search, widgets, weather, and more to a user's default browser. MSEdgeRedirect versions before 0.5.0.1 are vulnerable to Remote Code Execution via specifically crafted URLs. This vulnerability requ

How urgent is CVE-2021-43844?

Priority 58/100. High severity; Public exploit reference

References

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