CVE-2026-2537
Published: 16 February 2026
Summary
CVE-2026-2537 is a medium-severity Injection (CWE-74) vulnerability in Comfast Cf-E4 Firmware. Its CVSS base score is 5.1 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 47.8th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and AC-3 (Access Enforcement).
Deeper analysis
CVE-2026-2537 is a command injection vulnerability affecting the Comfast CF-E4 firmware version 2.6.0.1. It impacts an unknown function within the file /cgi-bin/mbox-config?method=SET§ion=ntp_timezone of the HTTP POST Request Handler component. Manipulation of the timestr argument enables command injection, as classified under CWE-74 and CWE-77.
The vulnerability allows remote exploitation over the network with low attack complexity but requires high privileges (PR:H) and no user interaction. Attackers with privileged access can achieve low-level impacts on confidentiality, integrity, and availability (CVSS 4.7; CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L), potentially leading to remote code execution.
Advisories from VulDB document the issue, and a public exploit is available on GitHub at https://github.com/cha0yang1/COMFAST/blob/main/RCE.md. The vendor was contacted early for disclosure but provided no response, leaving no official patches or mitigation guidance.
The exploit is publicly available and might be used in attacks, with no further details on real-world exploitation.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-6124
Vulnerability details
A vulnerability was identified in Comfast CF-E4 2.6.0.1. This impacts an unknown function of the file /cgi-bin/mbox-config?method=SET§ion=ntp_timezone of the component HTTP POST Request Handler. Such manipulation of the argument timestr leads to command injection. The attack may be launched remotely.…
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The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Command injection in exposed web CGI handler directly enables T1190 (public-facing app exploitation) and T1059.004 (Unix shell command execution on embedded Linux firmware).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly blocks command injection by validating/sanitizing the timestr argument before it reaches the NTP timezone handler.
Limits the high-privilege accounts required to reach and exploit the vulnerable /cgi-bin/mbox-config endpoint.
Enforces access policy on the HTTP POST handler so only explicitly authorized subjects can invoke the SET ntp_timezone function.