CVE-2021-3850: Authentication Bypass by Primary Weakness in GitHub repository adodb/adodb prior to 5.20.21.

Q: How do I fix CVE-2021-3850?

adodb: upgrade to newer than 5.20.21; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2021-3850 being exploited?

CVE-2021-3850 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-2021-3850 affect?

CVE-2021-3850 affects adodb, debian linux. Severity is critical (CVSS 9.1). Authentication Bypass by Primary Weakness in GitHub repository adodb/adodb prior to 5.20.21.

Q: How urgent is CVE-2021-3850?

Priority 67/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

This week

CRITICAL 9.1REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2021-3850 is a critical-severity flaw (CVSS 9.1) affecting adodb, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Authentication Bypass by Primary Weakness in GitHub repository adodb/adodb prior to 5.20.21.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.2% (top 18%)
CISA exploited list	No
Weakness	CWE-305, CWE-287
Published	2022-01-25
Last modified	2026-06-17

Publisher (CNA): huntr.dev · Vendor: adodb project · debian

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

Am I affected?

Timeline

2022-01-25 15:15 UTCPublished CVE record published
2026-06-17 04:05 UTCUpdated Record last modified

adodb project adodb UPGRADE

Affected: <= 5.20.21

Fixed in: newer than 5.20.21

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 5.20.21 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade adodb

Note

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

debian debian linux MITIGATE

Affected: 9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2021-3850?

adodb: upgrade to newer than 5.20.21; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-3850 being exploited?

CVE-2021-3850 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-2021-3850 affect?

CVE-2021-3850 affects adodb, debian linux. Severity is critical (CVSS 9.1). Authentication Bypass by Primary Weakness in GitHub repository adodb/adodb prior to 5.20.21.

How urgent is CVE-2021-3850?

Priority 67/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Software pages

GitHub vulnerabilities · Debian vulnerabilities

References

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