Is CVE-2021-26728 actively exploited?

No active exploitation of CVE-2021-26728 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-26728 be exploited remotely?

Yes. CVE-2021-26728 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-26728?

CVE-2021-26728 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2021-26728

CWE-94Published: October 24, 2022· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Command injection and stack-based buffer overflow vulnerabilities in the KillDupUsr_func function of spx_restservice allow an attacker to execute arbitrary code with the same privileges as the server user (root). This issue affects: Lanner Inc IAC-AST2500A standard firmware version 1.10.0.

NVD Source

Risk Analysis

This vulnerability involves command injection and buffer overflow flaws in the spx_restservice component, which could allow an unauthenticated attacker to execute arbitrary code as root. Given the critical CVSS score of 9.8 and the ability to gain full system control, this represents a severe security risk.

There is no known public exploit for this vulnerability, and it is not currently listed in the CISA KEV catalog. It is remotely exploitable with low attack complexity.

Recommended Action

Users should update Lanner Inc IAC-AST2500A firmware to a version beyond 1.10.0 if available.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-26728 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.