Cyber Resilience

CVE-2024-31815

CriticalPublic PoC

Published: 08 April 2024

Published
08 April 2024
Modified
17 June 2025
KEV Added
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Patch
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CVSS Score v3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS Score 0.0010 26.5th percentile
Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2024-31815 is a critical-severity Authorization Bypass Through User-Controlled Key (CWE-639) vulnerability in Totolink Ex200 Firmware. Its CVSS base score is 9.1 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 26.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

In TOTOLINK EX200 V4.0.3c.7314_B20191204, an attacker can obtain the configuration file without authorization through /cgi-bin/ExportSettings.sh

CWE(s)
CWE-639

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 →
T1602.002 Network Device Configuration Dump Collection
Adversaries may access network configuration files to collect sensitive data about the device and the network.
attack.mitre.org →
T1552.001 Credentials In Files Credential Access
Adversaries may search local file systems and remote file shares for files containing insecurely stored credentials.
attack.mitre.org →
Why these techniques?

Unauthenticated access to configuration export endpoint enables exploitation of public-facing application (T1190) and network device configuration dump (T1602.002). Config files typically contain credentials, facilitating credentials in files techniques (T1081, T1552.001).

Affected Assets

totolink
ex200 firmware
4.0.3c.7646_b20201211

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.

AC-24 Access Control Decisions
addresses: CWE-639

Per-request decision making makes it harder to bypass authorization using user-controlled keys without proper validation in the decision process.

AC-3 Access Enforcement
addresses: CWE-639

Consistent enforcement of approved authorizations makes bypassing via user-controlled keys ineffective.

References