CVE-2025-6621: A vulnerability classified as critical has been found in TOTOLINK CA300-PoE 6.2c.884

This month

MEDIUM 6.3MITIGATE

CVE-2025-6621 is a medium-severity flaw (CVSS 6.3) affecting ca300-poe firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability classified as critical has been found in TOTOLINK CA300-PoE 6.2c.884. This affects the function QuickSetting of the file ap.so. The manipulation of the argument hour/minute leads to os command injection. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	2.5% (top 15%)
CISA exploited list	No
Weakness	CWE-77, CWE-78
Published	2025-06-25
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: totolink

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

Am I affected?

Timeline

2025-06-25 18:15 UTCPublished CVE record published
2026-06-17 10:02 UTCUpdated Record last modified

totolink ca300-poe firmware MITIGATE

Affected: 6.2c.884

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.2c.884

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-2025-6621?

ca300-poe firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-6621 being exploited?

CVE-2025-6621 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-2025-6621 affect?

CVE-2025-6621 affects ca300-poe firmware. Severity is medium (CVSS 6.3). A vulnerability classified as critical has been found in TOTOLINK CA300-PoE 6.2c.884. This affects the function QuickSetting of the file ap.so. The manipulation of the argument hour/minute leads to os command injection. It is possible to in

How urgent is CVE-2025-6621?

Priority 48/100. Public exploit reference

Related CVEs

CVE-2025-6620 MEDIUM 6.3 MITIGATE A vulnerability was found in TOTOLINK CA300-PoE 6.2c.884
CVE-2025-6619 MEDIUM 6.3 MITIGATE A vulnerability was found in TOTOLINK CA300-PoE 6.2c.884
CVE-2025-6618 MEDIUM 6.3 MITIGATE A vulnerability was found in TOTOLINK CA300-PoE 6.2c.884
CVE-2025-44863 MEDIUM 6.5 MITIGATE TOTOLINK CA300-POE V6.2c.884_B20180522 was found to contain a command injection vulnerability in the msg_proce
CVE-2025-44862 MEDIUM 6.3 MITIGATE TOTOLINK CA300-POE V6.2c.884_B20180522 was found to contain a command injection vulnerability in the recvUpgra

References

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