Cyber Resilience

CVE-2025-6621

LowPublic PoC

Published: 25 June 2025

Published
25 June 2025
Modified
29 April 2026
KEV Added
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Patch
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CVSS Score v4 2.1 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0699 91.6th percentile
Risk Priority 8 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-6621 is a low-severity Command Injection (CWE-77) vulnerability in Totolink Ca300-Poe Firmware. Its CVSS base score is 2.1 (Low).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 8.4% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

Deeper analysis

A critical vulnerability has been identified in the TOTOLINK CA300-PoE firmware version 6.2c.884. It resides in the QuickSetting function within the ap.so file, where improper handling of the hour and minute arguments permits OS command injection. The flaw is remotely reachable and is tracked under CWE-77 and CWE-78.

An authenticated attacker can supply crafted values to these parameters over the network, resulting in arbitrary command execution on the device with limited impact to confidentiality, integrity, and availability. The CVSS 4.0 vector reflects a low-privilege remote attack that requires no user interaction.

Public proof-of-concept code has been released, confirming that exploitation details are available. The associated EPSS score remains flat at 0.0699 with no material increase since disclosure, indicating limited observed exploitation interest to date. No vendor advisory or patch information is referenced in the available sources.

EU & UK References

Vulnerability details

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.…

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The exploit has been disclosed to the public and may be used.

CWE(s)
CWE-77CWE-78

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1059.008 Network Device CLI Execution
Adversaries may abuse scripting or built-in command line interpreters (CLI) on network devices to execute malicious command and payloads.
attack.mitre.org →
T1202 Indirect Command Execution Stealth
Adversaries may abuse utilities that allow for command execution to bypass security restrictions that limit the use of command-line interpreters.
attack.mitre.org →
Why these techniques?

The remote OS command injection vulnerability in the web-based QuickSetting function (ap.so) of the TOTOLINK CA300-PoE network device enables exploitation of a public-facing application (T1190), arbitrary command execution via network device CLI/OS shell (T1059.008), and indirect command execution (T1202) as referenced in advisories.

Affected Assets

totolink
ca300-poe firmware
6.2c.884

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-27 Platform-independent Applications
addresses: CWE-78

Platform-independent apps typically execute inside a managed runtime or sandbox that restricts direct OS command execution, reducing the ability to exploit OS command injection.

SI-10 Information Input Validation
addresses: CWE-78

Validates inputs to block special elements that would alter OS command execution.

References