CVE-2021-20851: Cross-site request forgery (CSRF) vulnerability in Browser and Operating System Finder versions prior to 1.2 a

Q: How do I fix CVE-2021-20851?

browser and operating system finder: upgrade to 1.2. Exact commands for each OS are on this page.

Q: Is CVE-2021-20851 being exploited?

CVE-2021-20851 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-2021-20851 affect?

CVE-2021-20851 affects browser and operating system finder. Severity is high (CVSS 8.8). Cross-site request forgery (CSRF) vulnerability in Browser and Operating System Finder versions prior to 1.2 allows a remote unauthenticated attacker to hijack the authentication of an administrator via unspecified vectors.

This month

HIGH 8.8UPGRADE

CVE-2021-20851 is a high-severity flaw (CVSS 8.8) affecting browser and operating system finder. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site request forgery (CSRF) vulnerability in Browser and Operating System Finder versions prior to 1.2 allows a remote unauthenticated attacker to hijack the authentication of an administrator via unspecified vectors.

Why this priority

High severity

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	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-352
Published	2021-12-01
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: browser and operating system finder project

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

Am I affected?

Timeline

2021-12-01 03:15 UTCPublished CVE record published
2026-06-17 03:34 UTCUpdated Record last modified

browser and operating system finder project browser and operating system finder UPGRADE

Affected: < 1.2

Fixed in: 1.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy browser-and-operating-system-finder || rpm -q browser-and-operating-system-finder || browser-and-operating-system-finder --version

2. UPGRADE to 1.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade browser-and-operating-system-finder

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade browser-and-operating-system-finder

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-2021-20851?

browser and operating system finder: upgrade to 1.2. Exact commands for each OS are on this page.

Is CVE-2021-20851 being exploited?

CVE-2021-20851 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-2021-20851 affect?

CVE-2021-20851 affects browser and operating system finder. Severity is high (CVSS 8.8). Cross-site request forgery (CSRF) vulnerability in Browser and Operating System Finder versions prior to 1.2 allows a remote unauthenticated attacker to hijack the authentication of an administrator via unspecified vectors.

How urgent is CVE-2021-20851?

Priority 45/100. High severity

References

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