CVE-2024-13966: ZKTeco BioTime allows unauthenticated attackers to enumerate usernames and log in as any user with a password

Q: How do I fix CVE-2024-13966?

biotime: upgrade to 9.0.4. Exact commands for each OS are on this page.

Q: Is CVE-2024-13966 being exploited?

CVE-2024-13966 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-2024-13966 affect?

CVE-2024-13966 affects biotime. Severity is high (CVSS 7.3). ZKTeco BioTime allows unauthenticated attackers to enumerate usernames and log in as any user with a password unchanged from the default value '123456'. Users should change their passwords (located under the Attendance Settings tab as "Self

Q: How urgent is CVE-2024-13966?

Priority 40/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.3REMOTEUPGRADE

CVE-2024-13966 is a high-severity flaw (CVSS 7.3) affecting biotime. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ZKTeco BioTime allows unauthenticated attackers to enumerate usernames and log in as any user with a password unchanged from the default value '123456'. Users should change their passwords (located under the Attendance Settings tab as "Self-Password").

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-1393
Published	2025-05-27
Last modified	2026-06-17

Publisher (CNA): Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government · Vendor: zkteco

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

Am I affected?

Timeline

2025-05-27 19:15 UTCPublished CVE record published
2026-06-17 07:03 UTCUpdated Record last modified

zkteco biotime UPGRADE

Affected: < 9.0.4

Fixed in: 9.0.4

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 9.0.4 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade biotime

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-2024-13966?

biotime: upgrade to 9.0.4. Exact commands for each OS are on this page.

Is CVE-2024-13966 being exploited?

CVE-2024-13966 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-2024-13966 affect?

CVE-2024-13966 affects biotime. Severity is high (CVSS 7.3). ZKTeco BioTime allows unauthenticated attackers to enumerate usernames and log in as any user with a password unchanged from the default value '123456'. Users should change their passwords (located under the Attendance Settings tab as "Self

How urgent is CVE-2024-13966?

Priority 40/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-6523 LOW 3.5 UPGRADE A vulnerability was found in ZKTeco BioTime up to 9.5.2

References

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