CVE-2024-46586: Draytek Vigor 3910 v4.3.2.6 was discovered to contain a buffer overflow in the sCloudPass parameter at v2x00.c

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HIGH 7.5REMOTEMITIGATE

CVE-2024-46586 is a high-severity flaw (CVSS 7.5) affecting vigor3910 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Draytek Vigor 3910 v4.3.2.6 was discovered to contain a buffer overflow in the sCloudPass parameter at v2x00.cgi. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted input.

Why this priority

High severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 61%)
CISA exploited list	No
Weakness	CWE-120
Published	2024-09-18
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

2024-09-18 15:15 UTCPublished CVE record published
2026-06-17 07:55 UTCUpdated Record last modified

draytek vigor3910 firmware MITIGATE

Affected: 4.3.2.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.3.2.6

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-2024-46586?

vigor3910 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-46586 being exploited?

CVE-2024-46586 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-2024-46586 affect?

CVE-2024-46586 affects vigor3910 firmware. Severity is high (CVSS 7.5). Draytek Vigor 3910 v4.3.2.6 was discovered to contain a buffer overflow in the sCloudPass parameter at v2x00.cgi. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted input.

How urgent is CVE-2024-46586?

Priority 41/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-46598 HIGH 7.5 MITIGATE Draytek Vigor 3910 v4.3.2.6 was discovered to contain a buffer overflow in the iprofileidx parameter at dialin
CVE-2024-46597 HIGH 7.5 MITIGATE Draytek Vigor 3910 v4.3.2.6 was discovered to contain a buffer overflow in the sPubKey parameter at dialin.cgi
CVE-2024-46596 HIGH 7.5 MITIGATE Draytek Vigor 3910 v4.3.2.6 was discovered to contain a buffer overflow in the sAct parameter at v2x00.cgi
CVE-2024-46595 HIGH 7.5 MITIGATE Draytek Vigor 3910 v4.3.2.6 was discovered to contain a buffer overflow in the saveitem parameter at lan2lan.c
CVE-2024-46594 HIGH 7.5 MITIGATE Draytek Vigor 3910 v4.3.2.6 was discovered to contain a buffer overflow in the saveVPNProfile parameter at v2x

References

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