CVE-2021-40616: thinkcmf v5.1.7 has an unauthorized vulnerability

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MEDIUM 6.5DOWNGRADE

CVE-2021-40616 is a medium-severity flaw (CVSS 6.5) affecting thinkcmf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

thinkcmf v5.1.7 has an unauthorized vulnerability. The attacker can modify the password of the administrator account with id 1 through the background user management group permissions. The use condition is that the background user management group authority is required.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-425
Published	2022-06-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: thinkcmf

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

Am I affected?

Timeline

2022-06-14 10:15 UTCPublished CVE record published
2026-06-17 04:07 UTCUpdated Record last modified

thinkcmf thinkcmf DOWNGRADE

Affected: 5.1.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.1.7

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.1.7 (Debian / Ubuntu)

apt-cache madison thinkcmf sudo apt install thinkcmf=<VERSION_BEFORE_5.1.7> sudo apt-mark hold thinkcmf

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

dnf --showduplicates list thinkcmf sudo dnf downgrade thinkcmf-<VERSION_BEFORE_5.1.7> sudo dnf versionlock add thinkcmf

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.

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-2021-40616?

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

Is CVE-2021-40616 being exploited?

CVE-2021-40616 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-2021-40616 affect?

CVE-2021-40616 affects thinkcmf. Severity is medium (CVSS 6.5). thinkcmf v5.1.7 has an unauthorized vulnerability. The attacker can modify the password of the administrator account with id 1 through the background user management group permissions. The use condition is that the background user managemen

How urgent is CVE-2021-40616?

Priority 42/100. Public exploit reference

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References

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