CVE-2024-51251: In Draytek Vigor3900 1.5.1.3, attackers can inject malicious commands into mainfunction.cgi and execute arbitr

This month

HIGH 8.0MITIGATE

CVE-2024-51251 is a high-severity flaw (CVSS 8.0) affecting vigor3900 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Draytek Vigor3900 1.5.1.3, attackers can inject malicious commands into mainfunction.cgi and execute arbitrary commands by calling the backup function.

Why this priority

High severity

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

Risk facts

CVSS score	8.0 (High)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-78
Published	2024-11-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: draytek

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

Am I affected?

Timeline

2024-11-04 14:15 UTCPublished CVE record published
2026-06-17 08:05 UTCUpdated Record last modified

draytek vigor3900 firmware MITIGATE

Affected: 1.5.1.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.5.1.3

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-2024-51251?

vigor3900 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-51251 being exploited?

CVE-2024-51251 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-2024-51251 affect?

CVE-2024-51251 affects vigor3900 firmware. Severity is high (CVSS 8.0). In Draytek Vigor3900 1.5.1.3, attackers can inject malicious commands into mainfunction.cgi and execute arbitrary commands by calling the backup function.

How urgent is CVE-2024-51251?

Priority 41/100. High severity

Related CVEs

CVE-2024-51304 HIGH 8.8 MITIGATE In Draytek Vigor3900 1.5.1.3, attackers can inject malicious commands into mainfunction.cgi and execute arbitr
CVE-2024-51301 HIGH 8.8 MITIGATE In Draytek Vigor3900 1.5.1.3, attackers can inject malicious commands into mainfunction.cgi and execute arbitr
CVE-2024-51300 HIGH 8.8 MITIGATE In Draytek Vigor3900 1.5.1.3, attackers can inject malicious commands into mainfunction.cgi and execute arbitr
CVE-2024-51299 HIGH 8.8 MITIGATE In Draytek Vigor3900 1.5.1.3, attackers can inject malicious commands into mainfunction.cgi and execute arbitr
CVE-2024-51298 CRITICAL 9.8 MITIGATE In Draytek Vigor3900 1.5.1.3, attackers can inject malicious commands into mainfunction.cgi and execute arbitr

References

← Back to latest CVEs